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热能动力工程 2016年第7期31卷 123-129,140页

作者：叶舟吴中旺詹培李春上海理工大学能源与动力工程学院上海200093 Shanghai City Key Laboratory on Multi-phase Flow and Heat Transfer in Power Engineering

采用有限元方法,基于Von-Mises失效理论,考虑平台结构阻尼和惯性载荷,利用ANSYS有限元软件和开源程序软件FAST分别研究了平台动态响应和结构应力。结果表明:螺旋侧板对Spar平台的自振频率没有明显影响;附加螺旋侧板可以有效减小平台在... 详细信息

采用有限元方法,基于Von-Mises失效理论,考虑平台结构阻尼和惯性载荷,利用ANSYS有限元软件和开源程序软件FAST分别研究了平台动态响应和结构应力。结果表明:螺旋侧板对Spar平台的自振频率没有明显影响;附加螺旋侧板可以有效减小平台在垂荡和纵摇方向的运动响应,但在纵荡方向上没有明显改善;螺旋侧板阻碍了海流的流动,增加了流动阻力,平台结构应力略有增加,且最大切应力约为最大等效应力的二分之一,但平台结构仍是安全的,而最大等效应力是影响平台安全稳定工作的关键。

关键词：漂浮式风力机 Spar平台结构优化强度动态响应

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叶片副翼摆角对两段式翼型气动性能的影响

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热能动力工程 2016年第9期31卷 45-51,132-133页

作者：祁良奎柳建华张良廖裕恺上海理工大学能源与动力工程学院上海200093 Shanghai City Key Laboratory on Multi-phase Flow and Heat Transfer in Power Engineering

以Spalart-Allmaras(S-A)湍流模型为计算模型,对风力机叶片NACA0018翼型在副翼摆角分别为0°、5°、10°和15°下的流体流动情况进行数值模拟,分析不同攻角下带副翼翼型上升阻力性能曲线以及翼型表面压力分布云图和流... 详细信息

以Spalart-Allmaras(S-A)湍流模型为计算模型,对风力机叶片NACA0018翼型在副翼摆角分别为0°、5°、10°和15°下的流体流动情况进行数值模拟,分析不同攻角下带副翼翼型上升阻力性能曲线以及翼型表面压力分布云图和流场流线图,研究不同摆角对带副翼翼型的空气动力学性能的影响。结果表明:相同攻角时,翼型的升力系数随着副翼摆角的增大而减小;副翼摆角的增大可以增大翼型的失速攻角,改善翼型周围流体的流动状况,提高翼型周围特别是副翼周围流体流动稳定性,抑制流动分离涡的形成。

关键词：副翼摆角失速涡

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Numerical Research on solar heating system with seasonal water tank heat storage

Numerical Research on solar heating system with seasonal wat...

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2013 International Conference on Materials for Renewable Energy and Environment

作者： Dongliang Sun Jinliang Xu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing Key Laboratory of Multi-Phase flow and Heat Transfer of Low-Grade Energy North China Electric Power University

ISBN: (纸本)9781479933372

This paper makes researches on a solar heating system with seasonal water tank heat storage(SHS-SWTHS) for a 9000m2 building located at Beijing,based on a similarity principle research method proposed by the present *** to the numerical results,the influence of the embedded depth of water tank on the system performance is analyzed based on two typical soils:granite and *** the granite soil,due to its high thermal conductivity and its high heat capacity,the system performance is affected greatly by the embedded *** the sand soil,due to its low thermal conductivity and its low heat capacity,the system performance nearly isn't affected by the embedded ***,with the increase of the embedded depth of water tank,the system performance tends to be consistent in different soils.

关键词： solar energy seasonal water tank heat storage similarity principle embedded depth solar fraction numerical simulation

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Investigation on the flow distribution characteristics of a water-wall intermediate header at a supercritical pressure

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Reneng Dongli Gongcheng/Journal of engineering for Thermal Energy and power 2006年第3期21卷 299-302页

作者： Zhu, Yu-Qin Bi, Qin-Cheng Chen, Ting-Kuan State Key Laboratory of Power Engineering Multi-Phase Flow Xi'an Jiaotong University Xi'an 710049 China

An investigation was conducted of the flow distribution characteristics of distribution header water-wall tubes under a supercritical pressure for a home-made 600 MW once-through boiler. The test parameters can be listed as follows: pressure p=23-25 MPa, mass flow rate G=400-1200 kg/(m2·s), working medium temperature t=10-400°C. An experimental study has been conducted of the impact of working medium pressure, mass flow rate and working medium temperature on the vertical water-wall tube flow distribution characteristics of the distribution header. The test results show that with an increase in mass flow rate, the uniformity of flow distribution among the vertical water-wall tubes could be enhanced. The non-uniformity of flow distribution will undergo a step increase near the quasi-critical points. Moreover, with an increasing pressure, the above-mentioned step increase will become weaker. By employing a discrete model of the parallel-connected branch tubes of the distribution header, the flow distribution among the distribution header vertical water-wall tubes was calculated and the calculation results are in good agreement with the test ones.

关键词： Distribution header Once-through boiler Supercritical pressure Vertical water-wall tubes

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Pressure-velocity coupling algorithm on non-orthogonal non-staggered grid

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Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics 2006年第1期23卷 93-96页

作者： Xie, Gong-Nan Wang, Qiu-Wang Zhang, Dong-Sheng Tao, Wen-Quan State Key Laboratory of Multi-phase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this paper, a new numerical procedure is proposed for the steady flow of a viscous, incompressible fluid based on SIMPLER algorithm on a non-orthogonal non-staggered grid, together with Cartesian velocity components as dependent variables in the momentum equations. The main feature of the algorithm is that the pressure and pressure correction equations are obtained by explicitly treating pressure cross-derivatives terms in interface contravariant velocities. A collocated arrangement of variables is introduced on numerical grids, and the cell face velocities are calculated by the momentum interpolation. It is proved that this algorithm can be effectively used to simulate fluid flow and heat transfer in complex geometry, by the validation calculation of flow inside branching channel.

关键词： Incompressible flow

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International Conference on Biomedical engineering and Biotechnology (iCBEB)

作者： Dongliang Sun Jinliang Xu State Key Laboratory of Alternate Electrical Power System Renewable Energy Sources North China Electric Power University Beijing China Beijing Key Laboratory of Multi-Phase flow and Heat Transfer of Low-Grade Energy North China Electric Power University Beijing China

In this paper, a similarity principle research method is proposed to research the solar heating system with seasonal water tank heat storage (SHS-SWTHS). In this method, the similarity principle is applied to build a model. The time period of the model is one hundredth of the prototype, and the volume of the model is one thousandth of the prototype. Then, the numerical and experimental researches on the SHS-SWTHS system can be implemented based on this model, which has the following advantages compared with the prototype: (1) the computation time can be shortened largely, (2) the investment and experiment period can be decreased greatly. In this paper the feasibility of this model is verified by the numerical researches, in which the PISO algorithm is adopted to compute the fluid flow and heat transfer in the water tank and the coupled heat transfer between the water tank and the surrounding soil. The result will lay a foundation for the further numerical and experimental researches based on the model.

关键词： Water heating Solar heating Prototypes Computational modeling Storage tanks Boundary conditions Numerical models

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Two-phase distributor in plate fin heat exchanger

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 31-36页

作者： Yuan, Pei Jiang, Guobao Zhang, Feini He, Yaling Tan, Minbang Tao, Wenquan School of Energy and Power Engineering State Key Laboratory of Multi-phase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China Company Jianyang 641400 Sichuan China

The maldistribution of two-phase flow is one of the major factors that deteriorate the heat transfer performance of plate-fin heat exchanger. The set-up of flow distributor at the heat exchanger inlet is one widely adopted engineering method to improve the flow distribution. In this paper the flow distribution performance of one type of distributor is experimentally tested by using air-water mixture. The test results show that the flow distributor studied can improve the two-phase flow distribution uniformity in plate-fin heat exchanger. © All Rights Reserved.

关键词： Two phase flow

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Direct numerical simulation of neighboring air-bubble rising process in a vertical channel

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Reneng Dongli Gongcheng/Journal of engineering for Thermal Energy and power 2007年第4期22卷 375-379页

作者： Li, Yan-Peng Zhang, Qian-Long Bai, Bo-Feng College of Environmental Science and Engineering Chang'an University Xi'an 710064 China National Key Laboratory on Multi-phase Flow Power Engineering Department Xi'an Jiaotong University Xi'an 710049 China

By adopting Level Set method and a Navier-Stokes equation coupled with a surface tension model and in combination with ALE (Arbitrary Lagrangian Eulerian) numerical algorithm, a direct numerical simulation was conducted of the rising process of two neighboring air bubbles inside a vertical channel. The emphasis was put on the study of the effect of 8 mm diameter air bubbles arranged at different spatial positions on the rear wake flows and their interactions. The numerical simulation can accurately reproduce the deformation, attraction and repellent action of the air bubble pairs. The calculation results of air bubble rising speed are in good agreement with those obtained by using an empirical formula. The simulation results show that the wake flows after the two air bubbles and their interaction determine the behavior of the rising air bubble pair. An air bubble pair rising side by side does not coalesce due to their wake zones being separated by a jet flow. When the air bubbles following the vertically rising air bubble pair have over 50% of their projection area entering the wake zones of their ahead air bubbles, however, a coalescence phenomenon will occur.

关键词： Air bubble pair Direct numerical simulation Level Set method Wake flow

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Efficient Water Reforming of Biomass to H2via Well-Organized Redox-Neutral Cleavage of C−C, O−H and C−H Bonds

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Angewandte Chemie 2024年第4期137卷

作者： Wen-Min Zhang Prof. Yang Li State Key Laboratory of Multi-phase Flow in Power Engineering and Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 712046 China

Hydrogen (H 2 ) is a clean and environmentally friendly energy carrier. The depletion of fossil fuels makes renewable H 2 production highly desirable. Water reforming of renewable biomass to hydrogen, with a relay of natural photosynthesis to biomass, would be an indirect pathway to realize the ideal but extremely challenging photocatalytic overall water splitting to hydrogen, with favorable thermodynamics. Since the seminal work of water reforming of biomass in 1980, great endeavors have been made. Nevertheless, hitherto, the entire kinetic pathway has been elusive, which seriously limits the reforming processes. Using a designed well-organized redox-neutral cleavage of C−C, O−H and C−H bonds enabled by photoelectrocatalysis, here, we show the efficient water reforming of biomass to hydrogen at room temperature, with a yield up to 93 %. The clear insights into the kinetic pathway with oxidation of carbon radicals to carbon cations as the indicated rate-determining step, would cast brightness for efficient and sustainable hydrogen production to accelerate the hydrogen economy.

关键词： hydrogen production biomass reforming photoelectrocatalysis iron catalysis redox-neutral chemical bonds cleavage

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Experimental study of bio-oil gasification with steam

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Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology 2012年第2期40卷 170-176页

作者： Wang, Yong-Wei Wang, Ze Song, Wen-Li Lin, Wei-Gang State Key Laboratory of Multi-Phase Complex Systems Institute of Process Engineering CAS Beijing 100190 China Henan Electric Power Research Institute Zhengzhou 450052 China

The experiment on the non-catalytic steam gasification of bio-oil was carried out in a lab-scale fixed bed reactor. The influence of operating parameters such as the temperature and the mol ratio of steam to carbon (S/C) on the gas yield and composition was investigated. The results show that increasing temperature can enhance the conversion of bio-oil to syngas;the carbon conversion of bio-oil can be as high as 97.8% at 1200°C, and the proportion of effective gas component (H2+CO) in the product gas is nearly 77% with a mol ratio of H2/CO=1.19. The mol ratio of H2/CO increases with an increase of S/C mol ratio, and reaches up to 3.69 at S/C=4. However, the addition of steam does not favor the increase of the composition of effective syngas. The product gas from steam gasification has a medium heating value.

关键词： Steam

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