检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Zhang, Dalin Li, Xinyu Jiang, Dianqiang Zhou, Xingguang Lv, Xindi Yun, Shichang Wu, Wenqiang He, Xuanang Li, Haoyang Min, Xin Chen, Kailong Tian, Wenxi Qiu, Suizheng Su, G.H. Zhao, Quanbin Fu, Yao Tang, Chuntao Zhuo, Wenbin Li, Jinggang Zuo, Jiaxu State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Shanghai Nuclear Engineering Research & Design Institute CO. LTD. Shanghai200233 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu610213 China China Nuclear Power Technology Research Institute Guangdong Shenzhen518000 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment People's Republic of China Beijing100082 China

Based on the analysis of energy structure and the development trends of advanced nuclear energy technology, combining the complementary advantages of nuclear energy and other energy sources in China, the Fluoride-salt-cooled High-temperature Reactor(FuSTAR) system has been proposed. FuSTAR system is designed to address production capacity issues in areas with energy shortages or resource concentration and can be combined with high-temperature process heat to achieve high-value-added processes such as hydrogen production. In this paper, the Tri-structural isotropic fuel combined with helical cruciform elements has been studied in detail on the neutron physics and thermal-hydraulic properties, and the flow and heat transfer experiment is carried out for the first time. The multilayer nonlinear programming method has been applied to the design of thermal transport systems. Then the optimal parameters and configuration of the thermoelectric conversion system are obtained by the superstructure optimization method. The inherent safety of FuSTAR is demonstrated through deterministic safety analysis. In addition, the iodine-sulfur cycle technology and the characteristics of tritium production are also analyzed. This study highlights the significant potential of integrating nuclear energy with other energy sources in an optimized energy-production system. © 2023, The Authors. All rights reserved.

关键词： Nonlinear programming

来源：评论

学校读者我要写书评

暂无评论

Modeling of particle interaction dynamics in standing wave acoustic field

引用

AEROSOL SCIENCE AND TECHNOLOGY 2019年第10期53卷 1204-1216页

作者： Fan, Fengxian Xu, Xuan Zhang, Sihong Su, Mingxu Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jun Gong Rd Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

Interactions between fine particles (PM2.5) suspended in flue gas can be promoted via application of acoustic fields. This may lead to particle collision and agglomeration, thereby facilitating possible realization of PM2.5 abatement. The dynamic behavior of particle interactions in standing wave acoustic fields, however, is not well understood, and this severely restricts the development of practical acoustic agglomeration devices. Availability of limited information concerning PM2.5 interactions, insufficient consideration of interaction mechanisms, and neglect of spatial variation in acoustic velocity under the standing wave condition are a few limitations of previous studies performed in this regard. To address these concerns, a theoretical model capable of accurately describing the interaction between two neighboring particles in a standing wave acoustic field was developed in this study. Experimentally obtained parameters, such as particle velocity due to acoustic entrainment, interaction pattern, and collision time, were reproduced via numerical simulations performed using the proposed model. Additionally, the influences of model improvements on PM2.5 interaction dynamics were analyzed. Finally, the proposed model was adopted to investigate the effect of particle size on collision time. Results demonstrate that in cases involving identically sized particles, the collision time significantly reduces with increase in particle size. Maintaining the size of a particle constant whilst increasing that of the other particle causes the collision time to decrease. This is coupled with reduction in initial orientation angle range corresponding to particle collision. Consequently, no collisions occur when a substantial difference exists between particle sizes. Copyright (c) 2019 American Association for Aerosol Research

关键词： Yannis Drossinos

来源：评论

学校读者我要写书评

暂无评论

Research of technical and economic performance of plastic capillary mats used as the heat exchanger of a closed-circuit cooling tower

引用

APPLIED THERMAL engineering 2019年 153卷 800-807页

作者： Liu, Jing-nan Zhang, Li-xin Lin, Zong-hu Gao, Ming Chen, Hao Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Sch Energy & Power Engn Shanghai 200093 Peoples R China Huadian Elect Power Res Inst Co Ltd Hangzhou 310030 Zhejiang Peoples R China

Closed-circuit cooling tower (CCT) using plastic capillary mats as heat exchanger can solve two important problems i.e. frozen and corrosion. Besides it has advantages of less tube weight, low noise, and inhibition scale. In this paper a CCT using polyethylene (PE) capillary mats as heat exchanger was designed and tested. Results show that traditional equations of evaporation cooling can be used to calculate the performance of closed-circuit cooling towers (CCTs) using plastic capillary mats. On this basis, comparisons of the heat dissipating capacity and cost was made about CCTs using five kinds of heat exchangers (exchangers with capillary mats of PE, thermally conductive polyethylene (TPE) and thermally conductive polypropylene (TPP), stainless-steel tubes and copper tubes respectively). Their heat dissipating capacity ratio of five CCTs is 66:83:89:96:100. Their cost ratio is 103:125:174:86:100. The paper also proved that CCTs with plastic capillary mats have better technical and economic performance.

关键词： Closed-circuit cooling tower Plastic capillary mats Technical and economic performance Thermal performance Frozen crack prevention Corrosion resistive

来源：评论

学校读者我要写书评

暂无评论

Energy extraction properties of a flapping wing with a deformable airfoil

引用

IET RENEWABLE power GENERATION 2019年第11期13卷 1823-1832页

作者： Zhu, Bing Zhang, Wei Huang, Yun Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China Marine Design & Res Inst China Shanghai Peoples R China

Flapping wing devices have attracted considerable attention as a new means of power extraction. The present study applies transient numerical calculations based on the dynamic mesh technique to investigate the influences of leading edge, trailing edge, or overall circular arc airfoil deformations on the power extraction efficiencies of a flapping wing device under the condition of maintaining a constant arc length along the mean camber line of the foil. The results indicate that airfoil deformations can improve the power extraction efficiency of the flapping wing device. The primary reason is that the active synchronised deformation of the foil increases the effective curvature and the velocity circulation around the foil. In addition, the performance curve of the flapping wing device exhibits two frequency ranges with relative high efficiency. In the low frequency region, if the leading edge vortex (LEV) detaches from the trailing edge just as the foil reverses its heaving direction, the foil will gain much more energy due to the positive power extraction of the pitching moment. In the high frequency region, a small steady body-attached vortex (BAV) maintains a high lift, and, thus, the device extracts more power due to the enhanced heaving force.

关键词： vortices deformation design engineering aerodynamics aerospace components energy extraction properties flapping wing deformable airfoil wing devices considerable attention environmental friendliness relatively easy fabrication environmental adaptability transient numerical calculations dynamic mesh technique trailing edge circular arc deformation power extraction efficiency active deformation nondeformable flapping foil design leading edge deformation power extraction performance low-frequency region high-frequency region frequency range active synchronised deformation relative high efficiency leading edge vortex detaches positive power extraction

来源：评论

学校读者我要写书评

暂无评论

Thermal deviation analysis of high-temperature reheater for single-tangential π type boiler

引用

APPLIED THERMAL engineering 2021年 192卷 116846-116846页

作者： Xie, Jianwen Wen Wubin Yang Bin Yang Fei Ping Li Zhang Fei Zhang Jianwen Shenhua Guohua Beijing Elect Power Res Inst Co Lt Beijing 100025 Peoples R China Jiangsu Guohua Chenjiagang Power Generat Co Ltd Yancheng 224631 Jiangsu Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shanghai Boiler Works Co Ltd Shanghai 200245 Peoples R China

For some pi type boilers with four-corner tangential and deep air staged low nitrogen combustion technology, under full load condition, the steam temperature deviation for both sides of reheater outlet can reach as high as 15 degrees C. The left and right cross arrangement of steam between two stage reheaters increases the steam temperature deviation at the outlet, and the large amount input of desuperheating water makes the economic efficiency of the unit decrease. The thermal deviation adjusting experiments of a 660 MW ultra-supercritical boiler were carried out by adjusting the level and up-and-down swing angle of the separated over-fire air nozzle, and the grid distribution of radiation intensity for particles at the high-temperature reheater area was measured by radiation spectroscopy. The results show that there exists strong visible radiation in this area. Under the 600 MW-load condition, the radiation heat transfer of particle accounts for 25.95% of the total heat absorption of the high-temperature superheater and particle combustion still exists, whose combustion share accounts for about 1.83% of the received carbon content of coal. The particle temperature and emittance data fitted from the Planck's law indicate that the high-temperature particles are enriched at single side due to the inertial effect of residual rotation of flue gas. The residual rotation momentum of the separated over-fire air is insufficient to balance the temperature rise of both sides of the low-temperature reheater. Therefore, a new type principle of reforming combustion system was proposed, which changes a five-layer Separated Over-fire Air (SOFA) nozzle to two-section of six-layer SOFA nozzle to mitigate the combustion delay of pulverized coal particles and sets the wall-type tangent circle arrangement of the upper separated over-fire air nozzle to improve the residual rotation momentum of flue gas.

关键词： Single tangential pi boiler High-temperature reheater Radiation intensity Thermal deviation Test measurement

来源：评论

学校读者我要写书评

暂无评论

Improved integration strategies for the singularity subtraction method to solve radiative integral transfer equations with specified temperature field

引用

INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2020年 149卷 106158-000页

作者： Zhou, Rui-Rui Li, Ben-Wen Wang, Wen-Kai Sun, Ya-Song Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Dalian Univ Technol Sch Energy & Power Engn Key Lab Ocean Energy Utilizat & Energy Conservat Minist Educ Dalian 116024 Peoples R China Northwestern Polytech Univ Sch Power & Energy Shaanxi Key Lab Thermal Sci Aeroengine Syst Xian 710072 Shaanxi Peoples R China Yangtze River Delta Res Inst NPU Ctr Computat Phys & Energy Sci Taicang 215400 Peoples R China

Solutions of the radiative integral transfer equations, which can avoid the ray effect, are usually adopted as benckmarks in the developing of discrete-ordinates-type methods for the radiative transfer equation. The singularity subtraction method is a popular method to deal with the singularity in radiative integral transfer equations. After singularity is removed, the remaining integral equations can be approximated by numerical quadratures. However, it was often ignored in previous researches that the integrands for the specified temperature problem are non-smooth in the whole domain, which would lead to reduced accuracy for the high order quadratures. In this paper, this issue is clarified, and also special treatments are proposed for the composite Boole's quadrature and the Chebyshev quadrature respectively. For the former, the quadrature weights are modified near the point on which the variables are to be solved, whereas for the latter, segments integration with interpolation is applied. The results for the plane-parallel problem show that, with such treatments, the accuracy of composite Boole's quadrature can be improved from the second order to the second/third order, and the accuracy of Chebyshev quadrature can be improved from the second order to the fourth order. The improved integration methods can be extended for the two-dimensional problem straightly, and the improvement on the accuracy is still observed. Further, since the improved Chebyshev quadrature can provide higher order accuracy than the improved composite Boole's quadrature, it is more suggested to adopt the improved Chebyshev quadrature to obtain the results with desired accuracy. Besides, the effects of parameters on the numerical errors are investigated. The errors increase with the optical thickness and the scattering albedo in the quadratic and linear relations, respectively.

关键词： Radiative heat transfer Radiative integral transfer equation Exponential integral Singularity subtraction method High order quadrature

来源：评论

学校读者我要写书评

暂无评论

An Optical Soot Particle Measurement Setup Based on CRDS and LII

An Optical Soot Particle Measurement Setup Based on CRDS and...

引用

Photonics and Electromagnetics Research Symposium - Fall (PIERS - Fall)

作者： Zhang, Jialuo Wang, Meng Su, Mingxu Yang, Huinan Chen, Jun Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

ISBN: (纸本)9781728153049

Based on laser-induced incandescence (LII) and cavity ring-down spectroscopy (CRDS), a measurement setup was established for the study of flame soot particles, and characterize the performance parameters. The measurement results of the path-integrated attenuation coefficient of soot particles show that the two-color LII test system and the CRDS system are independent of each other.

关键词： Dust

来源：评论

学校读者我要写书评

暂无评论

Surfactant effect on the hygroscopicity of aerosol particles at relative humidity ranging from 80% to 99.5%: Internally mixed adipic acid-ammonium sulfate particles

引用

ATMOSPHERIC ENVIRONMENT 2021年 266卷 118725-118725页

作者： Zhang, Chao Bu, Longxiang Fan, Fengxian Ma, Nan Wang, Yueshe Yang, Yang Groess, Johannes Yan, Jinpei Wiedensohler, Alfred Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Leibniz Inst Tropospher Res D-04318 Leipzig Germany Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Minist Nat Resources Key Lab Global Change & Marine Atmospher Chem Xiamen 361005 Peoples R China

Surfactant, which is ubiquitous in the atmosphere, has an important effect on the hygroscopicty of nanoscale atmospheric aerosol particles. However, the knowledge on the high relative humidity (RH) section (90-100%) is insufficient due to the limitation of traditional measuring instruments. In this study, the hygroscopicity of aerosol particles consisted of adipic acid (AA) and ammonium sulfate (AS) at RH = 80-99.5% was studied using the experimental and the theoretical method. The growth factor (GF) values at different RH were measured by the high humidity tandem differential mobility analyzer (HHTDMA). With some assumptions, a new model (Model 3 (UNIFAC)) accounting for the reduction of surface tension, the effect of the bulk-surface partitioning of AA and the non-ideal of solution on the particle hygroscopicity was established to describe the experimental results. An overall better performance is shown after comparing with six traditional models. Moreover, the partitioning of AA and the non-ideal of solution were investigated in details by comparing the outcomes of corresponding models. The comparisons between Model 2 (UNIFAC) and Model 3 (UNIFAC) and between Model 3 (Ideal) and Model 3 (UNIFAC) indicate that both the partitioning of AA and the non-ideal properties of solution in particles result in the decrease of GF. In addition, the change of water activity affected by these two dynamic processes acts as a more important factor than surface tension in the decrease of GF. Moreover, RH, the mass ratio and the initial diameter have significant impact on the AA partitioning, the non-ideal properties of solution and their influences on the hygroscopicity of particles.

关键词： Aerosol particles Hygroscopicity Surfactant High relative humidity Internal mixture

来源：评论

学校读者我要写书评

暂无评论

Measurement and modeling of nitrogen oxides absorption in a pressurized reactor relevant to CO2 compression and purification process

引用

INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL 2020年 100卷 103117-103117页

作者： Liu, Dunyu Li, Wei Cheng, Qian Jin, Jing Chen, Jun Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

The removal of nitrogen oxides under a high pressure has been widely accepted as an effective method for the treatment of oxy-fuel combustion flue gas. The high pressure promotes the oxidation of NO to NO2, subsequently removed by water to form nitric acid. However, both the measurement and modeling of nitrogen oxides absorption shows uncertainties. To quantify the nitrogen mass balance, gas-phase NO/NO2 and HNO2 were measured online, whereas liquid-phase HNO2 and HNO3 were analyzed offline. Nitrogen mass balance was achieved with a relative error within +/- 8%. To improve modeling accuracy, a novel multiparameter optimization method was proposed. Mass transfer coefficients of NO2/NO, rate constant of NO oxidation, surface area, and volume of liquid were optimized. The absorption of NO2 into a liquid was dominated by gas-phase mass transfer with the mass transfer coefficient decreasing from 1.77 x 10(-4) mol m(-2) s(-1) Kpa(-1) to 1.26 x 10(-4) mol m(-2) s(-1) Kpa(-1) with the increase of reactor pressure from 5 bar to 20 bar. The pressure dependent rate constant for NO oxidation agreed with gas-phase NO oxidation experimental measurement. It first decreased with the reactor pressure from 5 bar to 15 bar followed by an increase from 15 bar to 20 bar. The surface area of liquid decreased while the liquid volume increased with the rising reactor pressure indicating that liquid droplets were formed by gas bubbling and attached onto the inner surface of the reactor. This study resolved the uncertainties in measurement and modeling of the nitrogen oxides absorption process.

关键词： Nitrogen mass balance Nitrogen oxides Multiparameter optimization High pressure CO2 compression and purification

来源：评论

学校读者我要写书评

暂无评论

Hygroscopic growth of aerosol particles consisted of oxalic acid and its internal mixture with ammonium sulfate for the relative humidity ranging from 80% to 99.5%

引用

ATMOSPHERIC ENVIRONMENT 2021年 252卷 118318-118318页

作者： Zhang, Chao Ma, Nan Fan, Fengxian Yang, Yang Groess, Johannes Yan, Jinpei Bu, Longxiang Wang, Yueshe Wiedensohler, Alfred Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Leibniz Inst Tropospher Res D-04318 Leipzig Germany Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China Minist Nat Resources Key Lab Global Change & Marine Atmospher Chem Xiamen 361005 Peoples R China

The hygroscopicity of atmospheric aerosol particles plays an important role in their effects on the environment and the public health. Oxalic acid (OA) has been recognized as the dominant dicarboxylic acid in the urban and the remote aerosol particles, so a number of studies have investigated the hygroscopicity of aerosols consisted of pure OA and its mixture with inorganic salt. However, few experimental studies have focused on the hygroscopicity of nanoscale particles at high relative humidity (RH) below saturation of water vapor (i.e., RH = 90?100%) due to the limitation of traditional measuring instruments. In this work, the hygroscopic growth factor (GF) of the aerosol particles composed of pure OA and internally mixed OA-ammonium sulfate (AS) at RH = 80?99.5% were studied using a high humidity tandem differential mobility analyzer (HHTDMA). The experimental results were used to verify the applicability of models including the ideal solution model, the extended aerosol inorganics model (E-AIM) combining with the revised universal quasi-chemical functional group activity coefficients (UNIFAC-Peng) model, the Aerosol Inorganic?Organic Mixtures Functional groups Activity Coefficients (AIOMFAC) model and the Zdanovskii?Stokes?Robinson (ZSR) model. According to the experimental results, the effect of RH, the composition and the initial dry particle diameter (D0) on the hygroscopic growth factor (GF) and the effective hygroscopicity parameter (lc) of particles at RH = 80?99.5% were analyzed in details. It has been found that for pure OA particles with D0 = 80/100 nm, the prediction of the UNIFAC-Peng model and the AIOMFAC model becomes more accurate than the ideal solution model with the increasing of RH, while all models cannot describe the GF of smaller particles at RH = 80?99.5%. For mixed OA-AS aerosol particles, the chemical reaction is an important reason for the discrepancies between the HHTDMA results and the model prediction. For the pure OA aerosol particle

关键词： Aerosol particles Hygroscopicity High relative humidity Oxalic acid Internal mixture

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：