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30th International Conference on Nuclear engineering, ICONE 2023

作者： Xiang, Zutao Li, Liangxing Zhao, Jiayuan Xu, Xiangyang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9784888982566

The main pump blades of lead cooled fast reactor have complex mechanical characteristics, and there are complex fluid-structure coupling problems in the structural analysis of the impeller. In this paper, CFX software is mainly used for numerical simulation to carry out one-way fluid-structure coupling research on the moving blade of the main pump. Generally, three kinds of materials as Ti3SiC2, T91 steel and 304 stainless steel are considered for the moving blade of main pump and the deformation distribution and equivalent stress distribution of the three models under the three moving blade materials are analyzed respectively. Finally, the modal analysis of the moving blade of the main pump is carried out. The results show that the resistance to deformation of moving blade made in Ti3SiC2 is better than those of T91 steel and 304 stainless steel;The equivalent stress on the pressure surface of Ti3SiC2 is slightly higher than those of T91 steel and 304 stainless steel, and the maximum equivalent stress on the pressure surface of moving blade occurs on the inner edge of the blade. This research can provide reference for the design of moving blades, and help to improve the service life of the main pump. © 2023 by JSME.

关键词： Numerical models

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Analysis for fuel rod performance under LOCA based on the FROBA-ROD 2.0 code

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 54-65页

作者： Liao, Haoyu Li, Chenxi He, Yanan Wu, Yingwei Zhang, Yapei Tian, Wenxi Su, G.H. Qiu, Suizheng School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Loss of Coolant Accident (LOCA) is one of the major design-basis accidents in LWRs. Fuel rod may fail due to the rupture of the cladding. By developing a LOCA simulation module, the steady-state fuel rod performance analysis code, FROBA-ROD, is now capable to predict fuel rod behaviors under a LOCA transient. The relevant models and the code was verified and validated by comparing with authoritative commercial codes and with the experimental measurements. Comprehensive calculations and analyses of fuel rod behaviors under different LOCA transients were performed by the new version of FROBA-ROD. Compared the failure conditions to the non-failure conditions through the simulation results, a cladding failure threshold equation was found for a better estimate of the integrity of high burnup fuel rods under LOCA transients. © 2021 Xi'an Jiaotong University

关键词： Loss of coolant accidents

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Experimental study on flow characteristics of rectangular narrow channel

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International Journal of Advanced Nuclear Reactor Design and Technology 2020年 2卷 60-68页

作者： Song, Gongle Sun, Rulei Zhang, Dalin Su, G.H. Tian, Wenxi Qiu, Suizheng School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Plate fuel elements is gradually used in advanced reactor structure design because of its advantages of high fuel consumption and high safety. The flow channel of the plate fuel element is a typical rectangular narrow channel, and accurately obtaining the flow characteristics of the rectangular narrow channel has become the most basic problem in the thermal and hydraulic research of the rectangular narrow channel. The flow characteristics of a rectangular narrow channel with cross-section of 3 × 67 mm and length of 745 mm are studied experimentally. The mass flow range is 50–650 kg/h, the pressure is 0.1–1 MPa, and the range of the inlet temperature is 283.15–333.15 K. The Reynolds number obtained experimentally in the laminar-turbulent transition region is in the range of 2700–4000, which has a significant delay compared to round channels. Laminar flow is modeled theoretically, and the Fourier sine transform method is used to solve the momentum Navier-Stocks equation, and the expression of the friction coefficient is obtained through the velocity distribution. However, due to the particularity of the test section, the error of the theoretical solution is large compared with experimental data. Five empirical correlations commonly used in rectangular narrow channels are evaluated. The Leon correlation is applicable to the experimental laminar flow area, and the Blasius correlation is applicable to the turbulent flow area. In order to further reduce the error, the friction correlation applicable to this experimental condition is fitted, making the prediction of friction coefficient more accurate. For subsequent experimental research on heat transfer, flow pattern, CHF, flow instability, etc., these works are of great significance. © 2020 Xi'an Jiaotong University

关键词： Laminar flow

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Study on factors of combustion characteristics of coals with thermo-balance

Study on factors of combustion characteristics of coals with...

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International Conference on power engineering 2013, ICOPE 2013

作者： Fu, Jiapeng Luo, Qinlan Chang, Yan Li, Na Zhou, Qulan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 China

With the experimental system of thermo-balance, the combustion characteristics of powders of different kinds of coals under various experimental conditions are studied by using the method of thermo-gravimetric analysis and differential scanning calorimetry. Different factors such as heating rate, particle size and additives on the combustion characteristics are investigated. The results show that, with the raise of heating rate , coal combustion TG and DTG curves of different kinds of coal move to higher temperature zone and the combustion rate increases while the characteristics of ignition and burnout is strengthened. With the sample weight increasing, the ignition temperature and coal combustion rate decreases and the burnout temperature increases. With the decrease of particle size of coal powder, combustion characteristics are commonly enhanced firstly and wakened later. Additives such as K2CO3, Ca(OH)2, Fe(NO3)3·9H2O, FeSO4 can promote coal combustion in the low temperature zone(573∼723K).

关键词： Heating rate

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Measurement of laminar burning velocities and Markstein lengths for diethyl ether-air mixtures at different initial pressure and temperature 7

Measurement of laminar burning velocities and Markstein leng...

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7th Asia-Pacific Conference on Combustion, ASPACC 2009

作者： Di, Yage Huang, Zuohua Zhang, Ni Gu, Xiaolei Zheng, Bin Zhang, Zhiyuan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

Measurement of laminar burning velocities and Markstein lengths were made for the diethyl ether-air mixtures at different equivalence ratios, initial temperatures and pressures by using spherically propagating flame and schlieren photography method. The results show that the stretched flame propagation speeds and unstretched laminar burning velocities are increasing with the increase of the initial temperature. While the Markstein lengths are decreased with the increase of the initial temperature. The stretched flame propagation speeds, the unstretched laminar burning velocities and Markstein lengths are decreased with the increase of the initial pressure. The Markstein lengths are decreased with the increase of the equivalence ratio. Based on the experimental data, a correlation is obtained for the unstretched laminar burning velocity versus the initial temperature and pressure over wide range of equivalence ratios. © 2009 Combustion Institute. All rights reserved.

关键词： Mixtures

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Numerical simukation of nitrogen condensation flow in acryogeni nozzle 24

Numerical simukation of nitrogen condensation flow in acryog...

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24th IIR International Congress of Refrigeration, ICR 2015

作者： Wan, Sun Guoqing, Liu Lu, Niu Shuangtao, Chen Yu, Hou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 China

ISBN: (纸本)9782362150128

2-D numerical simulations on the nitrogen expansion flow with spontaneous condensation in a nozzle were conducted based on the equilibrium model and the non-equilibrium model respectively. In the equilibrium model, the mass transfer between the liquid and vapor is determined by the saturation enthalpies of the liquid and vapor phases. The pressure distribution of the nozzle could be influenced slightly by the condensation process. In the non-equilibrium model, the classical nucleation model is used for the droplets formation. The flow is heated by the latent heat and consequently the decrease of pressure and the increase of Mach number are delayed. Meanwhile, due to the requirement of a certain supercooling level, the condensation onset point is pushed away from the nozzle inlet, and the nozzle outlet wetness fraction becomes smaller. Then, the influence of the nozzle inlet temperature and inlet pressure on gas supercooling, nucleation rate and wetness are analyzed.

关键词： Nucleation

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Electrospinning engineering of gas electrodes for high-performance lithium-gas batteries

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Carbon Energy 2024年第10期6卷 353-398页

作者： Jingzhao Wang Xin Chen Jianan Wang Xiangming Cui Ze Wang Guangpeng Zhang Wei Lyu Maxim Shkunov S.Ravi P.Silva Yaozu Liao Kai Yang Wei Yan State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and EngineeringSchool of Energy and Power EngineeringXi'an Jiaotong UniversityXi'anChina Advanced Technology Institute University of SurreyGuildfordSurreyUK State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghaiChina

Lithium-gas batteries(LGBs)have garnered significant attention due to their impressive high-energy densities and unique gas conversion ***,the practical application of LGBs faces substantial challenges,including sluggish gas conversion kinetics inducing in low-rate performance and high overpotential,along with limited electrochemical reversibility leading to poor cycle *** imperative task is to develop gas electrodes with remarkable catalytic activity,abundant active sites,and exceptional electrochemical ***,a versatile and well-established technique for fabricating fibrous nanomaterials,has been extensively explored in LGB *** this work,we emphasize the critical structure-property for ideal gas electrodes and summarize the advancement of employing electrospun nanofibers(NFs)for performance enhancement in *** elucidating the fundamental principles of LGBs and the electrospinning technique,we focus on the systematic design of electrospun NF-based gas electrodes regarding optimal structural fabrication,catalyst handling and activation,and catalytic site optimization,as well as considerations for large-scale *** demonstrated principles and regulations for electrode design are expected to inspire broad applications in catalyst-based energy applications.

关键词： carbon nanofibers electrocatalyst electrospinning gas electrodes metal-gas batteries

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Design and simulation of a novel geothermalsolar combined chimney power plant

Design and simulation of a novel geothermalsolar combined ch...

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26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013

作者： Cao, Fei Ma, Qiuming Zhao, Liang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

The solar chimney power plant (SCPP) is dominated by the solar radiation, and therefore its discontinuous operation is an unavoidable problem. In this paper, low temperature geothermal energy is introduced into the SCPP for overcoming this problem. Based on a developed mathematical model, theoretical analyses are carried out to investigate the performance of the geothermal-solar chimney power plant (GSCPP) with main dimensions the same as the Manzanares prototype in Spain. It is found that the GSCPP can attractively run in the full geothermal mode to deliver power continuously, which could solve the problem of the SCPP's running without sunlight in a long time, including at night. In addition, the introducing of geothermal energy into the SCPP can highly improve its power capacity.

关键词： Geothermal energy

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Manipulating metal-oxygen local atomic structures in singlejunctional p-Si/WO_(3) photocathodes for efficient solar hydrogen generation

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Nano Research 2021年第7期14卷 2285-2293页

作者： Wu Zhou Chung-Li Dong Yiqing Wang Yu-Cheng Huang Lingyun He Han-Wei Chang Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityShaanxi 710049China Department of Physics Tamkang UniversityTamsui 25137TaiwanChina

Self-passivation in aqueous solution and sluggish surface reaction kinetics significantly limit the photoelectrochemical(PEC)performances of silicon-based ***,a WO_(3) thin layer is deposited on the p-Si substrate by pulsed laser deposition(PLD),acting as a photocathode for PEC hydrogen *** to bare p-Si,the single-junctional p-Si/WO_(3) photoelectrodes exhibit excellent and stable PEC performances with significantly increased cathodic photocurrent density and exceptional anodic shift in onset potential for water *** is revealed that the WO_(3) layer could reduce the charge transfer resistance across the electrode/electrolyte interface by eliminating the effect of Fermi level pinning on the surface of *** importantly,by varying the oxygen pressures during PLD,the collaborative modulation of W–O bond covalency and WO6 octahedral structure symmetry contributes to the promoted charge carrier transport and ***,a large band bending at the p-Si/WO_(3) junction,induced by the optimized O vacancy contents in WO_(3),could provide a photovoltage as high as~500 mV to efficiently drive charge transfer to overcome the water reduction ***,by manipulating W–O local atomic structures in the deposited WO_(3) layer,a great improvement in PEC performance could be achieved over the singlejunctional p-Si/WO_(3) photocathodes for solar hydrogen generation.

关键词： silicon local atomic structure water splitting photocathodes hydrogen generation

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A calculation method for evaluating thermal loss of solar cavity receiver

A calculation method for evaluating thermal loss of solar ca...

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2009 Asia-Pacific power and Energy engineering Conference, APPEEC 2009

作者： Jiabin, Fang Jinjia, Wei Xunwei, Dong Yueshe, Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424424870

One of the most important components of solar thermal power system is the solar central receiver, which performance is in direct relation to the efficiency of the whole power generation system. The calculation of internal surface heat flux and thermal efficiency of receiver therefore plays a very important role in receiver design. A calculation method of heat loass of a cavity receiver is put forward in this paper. The first step of this method is to use the Monte Carlo method to simulate the track of solar beam and compute surface heat flux inside the receiver. The second step is to employ the correlations of flow boiling heat transfer to figure out the convective heat transfer coefficient inside the tubes and then the wall temperature of the boiling tubes laid inside the receiver. The last step is to simulate the air flow field inside the receiver to calculate convective thermal loss of the receiver. As every step can not be independently done, all steps are coupled and an iterative scheme is needed. Internal surface heat flux and thermal efficiency of the receiver can be finally gained with this method, and the result can provide theoretical guide for receiver design. © 2009 IEEE.

关键词： Monte Carlo methods

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