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Supersonic shear layer characteristics of two fluids with a splitter plate

International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 1-10页

作者： Bai, Yuping Hong, Yibo Zhao, Quanbin Chen, Weixiong Chong, Daotong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Supersonic shear layer development affects mixing between the primary and secondary fluids in a supersonic ejector substantially. The splitter plate plays a key role in shear layer development in the near-trailing-edge region. In this paper, supersonic shear layers with various splitter plate thicknesses are calculated and analyzed. Two types of instability modes are found when various splitter plate thicknesses are used. The shock wave strength and absolute unstable region determine the instability modes. Shock waves can limit instability development but an absolute unstable region promotes instability development. Velocity thickness growth rates are found to be the result of the merging process between two or more adjacent vortices in the transition region. The number of vortices that merge depends on the ratio of the vortex shedding and nature frequencies. The velocity thickness growth rates are larger under the local instability mode than under the global instability mode since three vortices merge under the former mode but two vortices merge under the latter. This study may provide a helpful reference for the design of supersonic ejectors. © 2021 Xi'an Jiaotong University

关键词： Vortex flow

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Experimental Study on Non-Isothermal Mixing Characteristics of Water in T-Junction

Experimental Study on Non-Isothermal Mixing Characteristics ...

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2024 Academic Conference of China Instrument and Control Society, ACCIS 2024

作者： Liu, Shuhan Guo, Wencang Lei, Xianliang Yuan, Zhaojun Meng, Shuqi Jin, Desheng Xi'an Jiaotong University State Key Laboratory of Multiphase Flow Engineering Xian China China Nuclear Power Technology Research Institute Co. Ltd. Shen Zhen Guangdong China

ISBN: (纸本)9798350350326

T-junction is an essential component in piping system of various thermal systems. When hot and cold fluid mixing in the T-junction, several compound mechanisms (like turbulent mixing, turbulent penetration, fluid stratification) make the mixing characteristics more complex. To clearly reveal such mixing mechanism with non-isothermal fluids, an experimental study was conducted with Ultrasound Doppler Velocimetry (UDV) and fast-response thermocouples bundle. The results show that the local velocity uncertainty of the UDV is within 10%, the uncertainty of the thermocouple bundle is 0.5°C, and the response time is 66.7 ms. After verification, the mixing characteristics between the main and branch pipe under different momentum ratios and temperature differences were discussed. It is shown that as the momentum ratio decreases, the location of the most intense radial temperature fluctuations and velocity fluctuations shifts towards the lower wall. At the same time, the peak flow rate in the cross-section increases by 35.7% and the main branch fluid mixing is more homogeneous. As the temperature difference increases, the thermal stratification is more pronounced and the velocity fluctuation peak moves towards the upper wall of the pipe. © 2024 IEEE.

关键词： Thermocouples

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A Simulation Study of Solar Thermal Steam Generation for Thermal Recovery of Thick Oil Based on Aspen Plus 4

A Simulation Study of Solar Thermal Steam Generation for The...

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2022 4th International Conference on New Energy System and Electrical engineering, NESEE 2022

作者： Chen, Pengfei Chen, Kang Peng, Huaiwu Zhang, Yanlong Bawaa, Baercheng Zhao, Qiuyang Institute of Solar Engineering Technology Northwest Engineering Corporation Limited PowerChina Xi'an China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

High-temperature steam injection is a common means of thermal recovery of thick oil. Although the steam injection boiler currently used for thick oil injection can achieve fast start-stop control, the power consumption of the pump is large, and the boiler control is demanding. Besides, a large amount of fossil fuel is needed to supply the heat required for steam heating. Using solar thermal to realize the transformation of solar energy-molten salt heat energy-steam energy can effectively reduce the burning of fossil fuels and realize clean thermal recovery of thick oil. To ensure the actual demand of thermal recovery of thick oil, it is necessary to determine a reasonable steam evaporation volume and vapor phase fraction. This paper simulates a solar thermal heat exchange system for molten salt-steam based on Aspen Plus. The simulation results show that the heat load and required solar panel area of all heat exchangers rise when the evaporation volume increases. However, the superheater grows most slowly. When the vapor phase fraction at the evaporator outlet rises to 1, there is no phase change heat transfer in the superheater, and its heat load plummets to 230 kW. © Published under licence by IOP Publishing Ltd.

关键词： Steam

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Study on startup characteristics of prototype once-through steam generator for China fast reactor

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International Journal of Advanced Nuclear Reactor Design and Technology 2022年第1期4卷 26-35页

作者： Min, Xin Zhang, Dalin Xu, Rongshuan Wang, Shibao Chen, Youchun Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Once-through steam generator (OTSG) is a vital heat transfer equipment of China Fast Reactor-600 (CFR-600), and its startup characteristics are of great importance to the safe operation of nuclear power plant. In this paper, first of all, the Thermal-hydraulic analysis Code Of Sodium heated once-through Steam generator (TCOSS) has been further optimized, and the code was introduced in the text. Secondly, the Steam Generator Test Facility (SGTF) and India Commercial Fast Breeder Reactor (CFBR) were selected for steady-state verification, and the feedwater flow rate increase condition of the prototype OTSG experiment was selected for transient verification. All the verifications were in good compliance, which proved the reliability of the TCOSS code for subsequent calculation of startup conditions. Finally, taking the prototype OTSG of CFR-600 as the research object, and the transient characteristics of cold startup and hot startup have been predicted and analyzed. The results show that both processes of cold startup and hot startup for prototype OTSG can be realized stably. The simulation results of startup processes showed a good agreement with expectations, which can provide support for the development of CFR-600 steam generator. © 2022 Xi'an Jiaotong University

关键词： Steam generators

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Waste heat recovery in the coal-fired power generation integrated with post-combustion 3

Waste heat recovery in the coal-fired power generation integ...

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3rd International Conference on Electrical engineering and Mechatronics Technology, ICEEMT 2023

作者： Yang, Yali Wang, Guiwen Li, Yan Liu, Yongping Fu, Yue Liu, Ming Guoneng Jinjie Energy Co. Ltd Yulin China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9798350303698

Post combustion systems (PCS) are a viable technology option to reduce carbon dioxide in the electricity production. However, the energy-intensive of PCC precludes its wide scale application. As for the optimization of the post combustion system, there is an optimal inlet temperature of the stripper. By optimizing the parameter of the post combustion system, the energy consumption rate of the post combustion system decreased by 1.4 GJ/t CO2 under 100% THA compared to the original post combustion system. The needed heat by the stripper shows a fall with the decrease of the unit load ratio. However, the heat changes of the post combustion system decrease with the decrease of the unit load ratio under 90% absorption rate. The efficiency penalty can be as low as 4.1% through waste heat recovery. © 2023 IEEE.

关键词： Carbon dioxide

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Investigation on the Transient Thermal Performance of a Mini-Channel Cold Plate for Battery Thermal Management

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Journal of Thermal Science 2021年第3期30卷 914-925页

作者： FANG Yidong SHEN Jiali ZHU Yue YE Fei LI Kang SU Lin School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Cold plate is an important component for a liquid battery thermal management *** order to study the transient thermal performance of the cold plate under conditions with sharply increasing heat loads,the numerical model of a battery cold plate is *** validation experiment shows that the error between the simulation and experiment is around 2.5%to 5%.Effects of the coolant flow rate,the increase in heat flux,and the channel number are analyzed to study the transient thermal performance of the cold *** show that the average temperature of the cold plate at 540 s is lowered from 28.3℃ to 26.9℃ when the coolant flow rate is raised from 0.065 kg/s to 0.165 kg/*** temperature deviation is decreased when the coolant flow rate is increased from 0.065 kg/s to 0.115 kg/s;however,it is slightly increased if the coolant flow rate is further *** average temperature and temperature deviation are raised if the final heat flux is increased from11000 W/m^(2) to 16500 W/m^(2),which are 2 and 3 times of the initial,*** addition,increasing the channel number has slightly positive effect on the average temperature of the cold plate,while the temperature deviation is increased when the channel number is increased from 3 to 11 due to the non-uniform velocity distribution between each *** results of this study will be helpful during the design of cold plate for battery thermal management,especially for transient conditions with sudden rising heat loads like thermal runaway.

关键词： battery thermal management cold plate transient analysis temperature distribution mini-channel

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Experimental and Numerical Investigations on Heat Transfer Characteristics of Supercritical Water in a Vertical Tube

SSRN

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SSRN 2024年

作者： Du, Xiaocheng An, Ning Wei, Ziyu Yang, Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

Heat transfer performance of working medium is important for supercritical units. In this work, heat transfer experiments and simulations were carried out at 25 to 29.8 MPa. The impacts and influence mechanisms of operation parameters on heat transfer characteristics were analyzed. To describe the fluid heat storage capacity, a metric called cdv is proposed. The findings indicate that thermal conductivity, cdv, and flow turbulence intensity are the three types of factors influencing heat transfer characteristics. As mass flux rises, the radial flow turbulence intensity increases, leading to an improvement in heat transfer performance. The impact of heat flux is mainly showed in high enthalpy zone. Due to the reduction in radial thermal conductivity, heat transfer enhances as heat flux decreases. Large specific heat zone, where the thermophysical parameters vary quickly, are where the influence of pressure is most evident. Because of the high thermal conductivity and cdv, the heat transfer characteristics get better as pressure drops. Finally, typical heat transfer correlations were evaluated using experiment results. The Bishop, Mokry and Miropoiskii-Shitsman correlations exhibited relatively large errors, and the correlations proposed by Swenson and Jackson have a low error and are highly consistent with the experiment results. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Dynamic Response of Offshore Wind Turbine on 3×3 Barge Array Floating Platform under Extreme Sea Conditions

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China Ocean engineering 2021年第2期35卷 186-200页

作者： LIU Qing-song MIAO Wei-pao YUE Min-nan LI Chun WANG Bo DING Qingwei School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Offshore wind farm construction is nowadays state of the art in the wind power generation ***,deep water areas with huge amount of wind energy require innovative floating platforms to arrange and install wind turbines in order to harness wind energy and generate *** conventional floating offshore wind turbine system is typically in the state of force imbalance due to the unique sway characteristics caused by the unfixed foundation and the high center of gravity of the ***,a floating wind farm for 3×3 barge array platforms with shared mooring system is presented here to increase stability for floating *** NREL 5 MW wind turbine and ITI Energy barge reference model is taken as a basis for this ***,the unsteady aerodynamic load solution model of the floating wind turbine is established considering the tip loss,hub loss and dynamic stall correction based on the blade element momentum(BEM)*** second development of AQWA is realized by FORTRAN programming language,and aerodynamic-hydrodynamic-Mooring coupled dynamics model is established to realize the algorithm solution of the ***,the 6 degrees of freedom(DOF)dynamic response of single barge platform and barge array under extreme sea condition considering the coupling effect of wind and wave were observed and investigated in *** research results validate the feasibility of establishing barge array floating wind farm,and provide theoretical basis for further research on new floating wind farm.

关键词： Barge floating platform extreme sea conditions dynamic response stability

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Evaporation and drying characteristics of the sessile ferrofluid droplet under a horizontal magnetic field

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Fundamental Research 2022年第2期2卷 222-229页

作者： Zhaonan Liu Jiandong Zhou Yang Li Xin Zhuo Xiujuan Shi Dengwei Jing State Key Laboratory of Multiphase Flow in Power Engineering and International Research Center for Renewable Energy X^an Jiaotong UniversityXi'an 710049China

In this study,the evaporation characteristics and drying patterns of various sessile ferrofluid droplets on certain substrate under horizontal magnetic fields of controlled intensities are *** effects of droplet concentration and magnetic field intensity on the duration of each evaporation stage and drying patterns of droplets have been systematically *** turned out that a plateau appears at the initial stage of evaporation in the absence of magnetic field and it was found that the plateau value is positively correlated with the concentration of ferrofluid *** the external magnetic field,the evaporation time of droplets decreases,the stage of contact line retreat extends,the stage of late pinning mode shortens,and the deposition area of ferrofluid droplet decreases compared to that of without magnetics *** deposition area increases gradually and becomes more uniform with the increase of magnetic *** decrease of friction force which is due to the decrease of the number of nanoparticles at the contact line under external magnetic field is the main reason for the observed *** found that the coffee ring and the uniform deposition inside the droplet will be destroyed when the magnetic field intensity is higher than a critical *** work has a significant reference value for the evaporation of sessile magnetic fluid droplets under the applied magnetic field,especially when the drying pattern needs to be precisely controlled,such as in spray or biomedicine.

关键词： Ferrofluid Droplet Drying pattern Evaporation characteristics Magnetic field

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Toward practical photoelectrochemical water splitting and CO_(2) reduction using earth-abundant materials

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Journal of Energy Chemistry 2021年第10期30卷 469-488,I0013页

作者： Yubin Chen Ya Liu Feng Wang Xiangjiu Guan Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Photoelectrochemical(PEC)fuel generation from water splitting and CO_(2)reduction(CO_(2)R)utilizing solar energy holds immense potential to solve the current energy and environmental *** the past decades,numerous studies have been devoted to this fast-growing research field,and it is essential to develop efficient photoelectrodes with earth-abundant materials for the practical application of PEC systems.A thorough review of earth-abundant materials and associated devices for PEC fuel generation is beneficial to uncover the inherent obstacles and pave the way for future ***,we summarize the recent progress of earth-abundant light-absorbers and cocatalysts in the PEC *** unbiased configurations and scaling-up strategies of PEC devices using earth-abundant materials are examined.A comparison between PEC water splitting and CO_(2)R is carried out to promote better understanding of the design principles for practical materials and ***,the prospects on advanced materials,underlying mechanisms,and reaction systems of PEC water splitting and CO_(2)R are proposed.

关键词： Solar energy Photoelectrochemical technology Water splitting CO_(2)reduction Earth-abundant materials

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