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International Conference on power engineering 2021, ICOPE 2021

作者： Xiaole, Chen Qulan, Zhou Du, Wen Qingtian, Liu Na, Li State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Elbow wear, which is most likely occurring in pneumatic conveying, becomes a key factor in development of pneumatic conveying. This paper used 3D DEM-CFD to simulate the elbow wear in pneumatic conveying system. Simulation results show that: elbow wear is linear with material mass flow rate. Elbow wear increases along with the increasement of material particle velocity. When the velocity changes from 0 to 10m/s, the elbow wear increases 3.13 times. Elbow wear increases while the radius of material particles is growing. When the particles radius increases from 0.1mm to 0.5mm, the elbow wear increases 11.13%. This paper also established a complete pneumatic conveying device for experiment. In pneumatic conveying experiment, the pressure loss was measured in situations: different airflow velocity, different velocity of material particles. The results of experiment show the same regular indicated in simulation. © 2021 The Japan Society of Mechanical Engineers.

关键词： Wear of materials

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Thermal-hydraulic performance evaluation of annular fuel based on modified FROBA-ANNULAR

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 108-118页

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

In this study, based on the modification of the pellet cladding mechanical interaction, gap closure process, and the cladding water corrosion model, Fuel Rod Behavior Analysis-ANNULAR (FROBA-ANNULAR) was uprated. The modified code was verified with FRAPCON-ANNULAR and ABAQUS. The verification calculation was under low power density when both two gaps were open. The calculation results showed good agreement. The modified code was then utilized to evaluate the annular fuel behavior, compared with the original code FROBA-ANNULAR. In this study, the annular fuel exhibits a much lower peak fuel temperature(about 900K). The different results for heat flux fraction(0.55 for the original code, 0.66 for the modified code) indicated that the gap closure process strongly affected the movement of the adiabatic pellet line. The internal pressure results (7.5 MPa for the original code, 6 MPa for the modified code) were also affected by the different assumptions. The results also showed that Zr's oxidation thickness and hydrogen concentration were related to both time and temperature. The higher the temperature was, the larger the oxidation rate was when the transition thickness was reached. © 2021

关键词： Heat flux

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Prediction of von Mises stress on the membrane wall in a lab-scale arch-fired boiler based on artificial neural work

Prediction of von Mises stress on the membrane wall in a lab...

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International Conference on power engineering 2021, ICOPE 2021

作者： Wen, Du Zhou, Qulan Pan, Yuqing Chen, Xiaole Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

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Experimental study on the CO-SCR performance of honeycomb-based Fe-Cu/RHA catalyst

Experimental study on the CO-SCR performance of honeycomb-ba...

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International Conference on power engineering 2021, ICOPE 2021

作者： Pan, Yuqing Li, Na Wen, Du Ran, Shiyuan Wu, Chenyang Zhou, Qulan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

The combustion process of carbon-based fuels will produce CO. If CO can be used as a reducing agent to remove NO, the goal of removing NO and unburned carbon (UBC) simultaneously can be achieved. When rice husk ash (RHA) rich in amorphous SiO2 is used to support Fe-Cu metal oxides, its huge specific surface area and non-lattice microstructure can reduce the reaction temperature, so that Fe-Cu/RHA catalyst has a high performance of selective catalytic reduction of NO by CO (CO-SCR). The paper used honeycomb ceramic to support Fe-Cu/RHA catalyst, and studied the effects of preparation method, active ingredient loading and reaction conditions on the CO-SCR performance of integral catalyst. The experimental results showed that the integral catalyst obtained by the heating and stirring method was better than the room temperature method. The conversion rates of CO and NO of the integral catalyst increased with the increase of the active ingredient loading. Besides, the oxygen concentration had little effect on the conversion rates of NO and CO. The conversion rate of CO to CO2 increased with the increase of temperature, and it could reach up to 98%. The conversion rate of NO to N2 fluctuated slightly as the temperature increased. © 2021 The Japan Society of Mechanical Engineers.

关键词： Selective catalytic reduction

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Experimental Study on Preparation of Amorphous SiO2 by Fluidized Bed Combstion of Rice Husk

Experimental Study on Preparation of Amorphous SiO2 by Fluid...

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International Conference on power engineering 2021, ICOPE 2021

作者： Tan, Jingkao Zhou, Qulan Yao, Yashu Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Rice husk ash contains SiO2 with a mass fraction of 87%-97%. Through controlled combustion under suitable conditions, SiO2 in rice husk ash will be amorphous, with high activity and rich porosity, which can be applied to construction, silicon preparation and adsorption *** it is necessary to study the effects of combustion parameters on the quality of RHA. Compared to conventional boiler furnace, the fluidized bed combustor has a lower combustion temperature and a longer residence time, which is suitable for the production of high quality amorphous rice husk ash. In this thesis, the effects of fluidized bed combustion parameters on the quality of RHA will be studied to provide guidance for amorphous SiO2 preparation by combustion control in boiler. On the existing 15kw bench-scale fluidized bed system, experiments were made to study the effects of fluidized bed combustion parameters on the quality of RHA. The rice husk combustion curve was comprehensively depicted, and the rice husk ash was analyzed by BET analysis, XRD scanning and thermogravimetric analysis. Therefore, the casual relationship between rice husk combustion process and RHA quality was evaluated comprehensively. © 2021 The Japan Society of Mechanical Engineers.

关键词： Quality control

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Vapor-liquid equilibrium of H2/CO2 and H2/N2/CO2 mixture, the liquefaction technology related to the supercritical water gasification products

Vapor-liquid equilibrium of H2/CO2 and H2/N2/CO2 mixture, th...

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International Multidisciplinary Conference on Computer and Energy Science (SpliTech)

作者： Hongtu Wu Hui Jin School of Energy and Power Engineering Xi’an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi’an China

In this paper, the dew point and liquid phase composition of H 2 /CO 2 and H 2 /CO 2 /N 2 mixtures at phase equilibrium calculated by PR-BM equation and Van Der Waal mixing rule with commercial MATLAB software are introduced, it is of theoretical significance for the wide application of the products of supercritical water gasification. First, the results obtained by the self-programming code are verified with the experimental data, the experimental data and simulation results of two kinds of CO 2 /H 2 mixtures and two kinds of CO 2 /N 2 /H 2 mixtures were compared. The average percentage deviation was 2.69%, 4.05%, 2.22%, 1.20%, respectively. Thus the absolute deviations of the mixtures are within the acceptable range, therefore, the model proposed in this paper can well predict the dew point of the mixtures composed of H 2 /CO 2 or H 2 /CO 2 /N 2 .Afterwards, the dew point and the CO 2 content in the liquid phase of common H 2 /CO 2 and H 2 /CO 2 /N 2 vapor mixtures in supercritical water gasification products were predicted, and a series of analysis and discussion were conducted on the predicted results finally.

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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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Genetically engineered nifA mutations in Rhodobacter capsulatus to enhance ammonium tolerance and hydrogen production

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International Journal of Hydrogen Energy 2025年 144卷 252-261页

作者： Zixuan Gao Xintong Gao Yu Ma Zhixuan Jiao Minmin Wang Xuefang Mu Jiali Feng Wen Cao Liejin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China College of Biology and Oceanography Weifang University Weifang 261061 Shandong China

NifA, the activator of nitrogenase, is sensitive to ammonium concentration, particularly within its N-terminal domain. In this work, genetically engineered mutants with N-terminal deletions of the nifA1 and nifA2 genes were constructed using overlap extension PCR to reduce the inhibitory effect of ammonium on nitrogenase expression in Rhodobacter capsulatus SB1003. Under 3 mM NH 4 + , the hydrogen production rate of ZX03 ( nifA1 - , nifA2 - ) reached 0.65 mmol L −1 h −1 , with a 31.2 % increase in hydrogen production compared to the wild-type. When 8 mM NH 4 + was used as the sole nitrogen source, H 2 production in all strains decreased substantially compared to 5 mM NH 4 + . However, ZX03 demonstrated a 5.2-fold enhancement in hydrogen production relative to the wild-type under 8 mM NH 4 + , underscoring its improved ammonium tolerance. During hydrogen production, the gene expression levels of nifA and nifH in all mutant strains were significantly up-regulated under ammonium conditions compared to the wild-type. These findings reveal distinct roles of nifA1 and nifA2 in ammonium tolerance and hydrogen production.

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Simultaneous Analysis of Liquid Film Instabilities and Properties of Swirl Sprays by Telecentric Shadowgraphy

SSRN

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SSRN 2023年

作者： Machado, Danilo Almeida Costa, Fernando S. Dias, Gabriel Silva Mota, Fábio A.S. Combustion and Propulsion Laboratory National Space Research Institute SP Cachoeira Paulista12630-000 Brazil State Key Laboratory of Multiphase Flows in Power Engineering Xi’an Jiaotong University Shanxi Xi’an710049 China

A telecentric shadowgraphy optical system was utilized to determine macroscopic and microscopic parameters of sprays and the measurement of conical liquid films formed by dual pressure swirl injectors. Spray cone angles, breakup lengths, mean droplet velocities, momentum flows, wave amplitude ratios and maximum wave growth rates were simultaneously measured using high-speed images with kHz frequencies. Two injectors were tested with inner nozzles having Abramovich geometric constants Kint = 2 and 2.125 and external nozzles with geometric constants Kext = 2.9 and 1.9792, respectively. Injection pressures were varied from 0.05 to 0.5 MPa and water was used as test fluid. The experimental data indicate that the breakup length, droplet velocity, flow momentum and disturbance amplitude ratio are higher for injectors with larger mass flow rates, for a given injection pressure. On the other hand, the maximum wave growth rate of the liquid film is higher for injectors with smaller mass flow rates. The maximum amplitude ratios of the conical liquid film disturbances varied in the range 2.32 © 2023, The Authors. All rights reserved.

关键词： Liquid films

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Effect of Fuel System on the Heat Releasing Method and Flow-Path Design of Rocket-Based Combined Cycle Engine 14

Effect of Fuel System on the Heat Releasing Method and Flow-...

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14th International Conference on Mechanical and Aerospace engineering, ICMAE 2023

作者： Liu, Xiao Wang, Yinhu Yang, Yiyan Shi, Lei Yan, Dekun Xi'An Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China Beijing Institute of Long March Vehicle Beijing China Northwestern Polytechnical University Science and Technology on Combustion Internal Flow and Thermal-structure Laboratory Xi'an China

ISBN: (纸本)9798350340327

Multi-components rocket-based combined cycle (RBCC) engine is widely applied in most two-stage-To-orbit program due to stable operation performance under variable flight conditions. Present researches numerically compared RBCC's performance under ramjet mode and scramjet mode, respectively, by using two fuel system, hydrogen and kerosene together with a \mathrm{k}-\omega SST turbulence model. Researches showed that the combustor area ratio should be increased to keep stable pressure difference balance between inflow and flame because of higher caloric value using hydrogen. Distributed heat addition method is benifit for overall performance improvement when using hydrogen. Different from using kerosene, head should be delayedly added in combustor downtream under scramjet mode. Moreover, the advanced heat addition amount should be decreased under ramjet mode to ensure effective isolator operation. © 2023 IEEE.

关键词： Hydrogen

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