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SSRN 2025年

作者： Ou, Pingwen Chen, Yongzheng Chen, Peng Ouyang, Yong Guo, Chao Su, Guanghui China Nuclear Power Technology Research Institute Co. Ltd. Shenzhen518000 China State Key Laboratory of Nuclear Power Safety Technology and Equipment China Nuclear Power Technology Research Institute Co. Ltd. Shenzhen518000 China School of Nuclear Science and Technology Xi'an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering China

This study focuses on the uncertainty and sensitivity analysis of containment aerosol removal under severe accident conditions using the severe accident integral code ASTEC, validated by experiments carried by CNPRI, and the coupled uncertainty and sensitivity tool SUNSET. A "separated" methodology is introduced, which distinguishes between thermal-hydraulic and aerosol boundary conditions to highlight the impact of containment aerosol mechanisms. Eleven uncertainty input parameters related are selected for uncertainty propagation and the Spearman correlation coefficient is utilized to describe sensitivity. The removal factor exhibits significant variation, with peaks due to temporary enhancement of diffusiophoresis deposition caused by corium relocation and subsequent steam generation. Uncertainty in the removal factor is substantial before aerosol release termination and narrows afterward. The gravitational settling and the diffusiophoresis deposition are the most important contributors with approximately 70% and 20% deposited aerosol mass, respectively. The initial mass medium diameter, the gravitational shape factor and the agglomeration shape factor are the most influential input parameters in aerosol removal, including in-containment deposition and environmental release, and they should be considered discreetly with conservatism in source term estimation and radioactive consequence evaluation in nuclear engineering. © 2025, The Authors. All rights reserved.

关键词： Sensitivity analysis

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A Novel Water Content Sensor Design and its Application for In-Situ Water Content Measurement Inside the flow Channel of Pemfc

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SSRN 2022年

作者： Zhang, Yan Wang, Weiding Liu, Yukai Su, Jinzhan International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an710049 China

In-situ water content detection in proton exchange fuel cell (PEMFC) is of great importance to its water management. In this study, flexible thin film water content microsensor (WCMS) were fabricated and deployed for real-time measurement of water distribution inside the channel of proton exchange membrane fuel cells. The effect of inserting WCMS on the cell performance was confirmed to be negligible. Besides, three WCMS were used to monitor the variation of water distribution in the upstream, midstream and downstream of the flow channel, respectively. The experimental results show that the WCMS can efficiently detect the change of water content inside the fuel cell in real time. The co-occurrence phenomenon of water column clogging in the flow channel and degradation of cell performance were observed. This work provide a novel design of WCMS and its application on the water content distribution inside flow channel of fuel cells. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Experimental Study on Electrocatalytic Reduction of CO2 to Methanol over Cu2O and Cu2O/ZnO films

Experimental Study on Electrocatalytic Reduction of CO2 to M...

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International Conference on power engineering 2021, ICOPE 2021

作者： Zhang, Wenfei Zhou, Qulan Qi, Ji Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China China Mobile System Integration Co. Ltd Beijing100052 China

The Cu2O film electrodes were prepared by solution immersion method, the ZnO/Cu2O film electrodes were prepared by electrodeposition method. Then the pure Cu2O film electrodes and ZnO/Cu2O film electrodes were used to reduce CO2 to CH3OH. The crystal structure, morphology, particle size and specific surface area of pure Cu2O films prepared under different immersion time and ZnO/Cu2O films prepared under different deposition time and Zn2+ concentration were analyzed by XRD, SEM, and BET. The electrolytic activity of the pure Cu2O film electrodes and ZnO/Cu2O film electrodes were studied. Under the same reaction conditions, the Cu2O film electrode with 2 h preparation time has the best electrolysis effect in the three groups of pure Cu2O electrode. The increase of reaction temperature can significantly promote the reduction of CO2 to CH3OH on Cu2O film electrodes. the ZnO/Cu2O film electrode with the Zn2+ concentration of 0.05 M and the deposition time of 30 min had the highest total CH3OH yields. This study highlights that the ZnO have a very good promotion of electrolytic CO2 reduction on Cu2O film. © 2021 The Japan Society of Mechanical Engineers.

关键词： Carbon dioxide

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Research on Bionic Airfoil Design Method Based on Re-Evolution Optimization and Multi Objective Application on Horizontal Axis Wind Turbines

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SSRN 2023年

作者： Huang, Shengxian Yan, Hua Qiu, Huihe Wang, Ying Shanghai Key Laboratory of Multiphase Flow and Heat Transfer of Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong

The design of specific airfoil for wind turbine is a crucial factor in the research of wind turbine performance and stability. Based on biomimetic methods and numerical optimization methods, a brand new airfoil design method is proposed without relying on any traditional airfoil and airfoil design experience. A new airfoil is successful designed that gives consideration to both aerodynamic performance and roughness sensitivity. Based on the actual engineering environment of a horizontal axis wind turbine, the multi-island genetic algorithm is used to adjust the profile of the biomimetic airfoil (Dol-Rot24°). The optimized airfoil is named as Dol-Opt. In the performance verification of the Dol-Opt airfoil, it is found that compared with the Dol-Rot24°, the lift coefficient of the Dol-Opt airfoil is increased by 171.06%, and the lift-to-drag ratio is increased by 52.41% at most. Moreover, the roughness sensitivity of the Dol-Opt is also the optimum among the three airfoils (S809, Dol-Rot 24°, Dol-Opt). By conducting numerical simulations, it is found that the newly optimized wind turbine blades exhibit greatly improved energy efficiency. The purpose of this study is to provide effective references for the design, bionic methods, and practical engineering applications of wind turbine specific airfoils. © 2023, The Authors. All rights reserved.

关键词： Airfoils

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Research on Bionic Airfoil Design Method Based on Re-Evolution Optimization and Multi Objective Application on Horizontal Axis Wind Turbines

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SSRN 2023年

作者： Huang, ShengXian Yan, Hua Qiu, HuiHe Wang, Ying Shanghai Key Laboratory of Multiphase Flow and Heat Transfer of Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong

The design of specific airfoil for wind turbine is a crucial factor in the research of wind turbine performance and stability. Based on bionic methods and numerical optimization methods, a brand new airfoil design method is proposed without relying on any traditional airfoil and airfoil design experience. This study proposes a re-evolution method (numerical optimization methods) suitable for designing bionic airfoils based on the previously proposed bionic airfoil (Dol-Rot24°), which was inspired by the Dall's Porpoise. According to this method, a new airfoil is successful designed that gives consideration to both aerodynamic performance and roughness sensitivity. The research content mainly focuses on two aspects: new airfoil design and the new airfoil performance verification. In terms of the new airfoil design, a surrogate model based on radial basic function (RBF) is established for predicting aerodynamic performance and roughness sensitivity of airfoils. This surrogate model can significantly reduce the cost of bionic airfoil optimization calculations, and control the time of 8000 optimization iterations within 1 minute. Based on the actual engineering environment of a horizontal axis wind turbine, the multi-island genetic algorithm is used to adjust the profile of the Dol-Rot 24° airfoil. The optimized airfoil is named Dol-Rot 24° opt. In the performance verification of the Dol Rot 24° opt airfoil, it is found that compared with the Dol Rot 24° airfoil, the lift coefficient of the Dol Rot 24° opt airfoil is increased by 171.06%, and the lift-to-drag ratio is increased by 52.41% at most. Moreover, the roughness sensitivity of the Dol-Rot 24° opt airfoil is also the best among the three airfoils (S809, Dol-Rot 24°, Dol-Rot 24° opt). By modeling the three airfoils according to the NREL Phase VI wind turbine blade parameters and conducting numerical simulations, it is found that the newly optimized wind turbine blades exhibit greatly improved energy efficiency. Th

关键词： Airfoils

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Analysis of Different Control Strategies Considering Individual Regulation of Heat User

Analysis of Different Control Strategies Considering Individ...

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Electrical engineering and Mechatronics Technology (ICEEMT), IEEE International Conference on

作者： Zhiwei Xun Huijie Wang Liyuan Wang Long Yang Yunfang Gao Ming Liu Guoneng Jinjie Energy Co. Ltd Yulin China Xi’an Jiaotong University Xi’an China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

In the process of outdoor temperature change, it is beneficial to improve the comfort of thermal users to formulate adjustment and control strategies according to the actual needs of each user. In this paper, different adjustment modes are established according to the thermal comfort of users, and the control strategies of rising and cooling within 0, 30 and 60 minutes are proposed, and the indoor temperature control effect and heating energy consumption of each adjustment mode under different control strategies are analyzed. The results show that: in different modes, when the rise and cooling time increase, compared with the design room temperature, the indoor temperature difference under the control mode is smaller, but the time needed to reach stability is longer. At the same time, the total heat load is unchanged, but the total pump work decreases.

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Research on Bionic Airfoil Design Method Based on Re-Evolution Optimization and Multi Objective Application on Horizontal Axis Wind Turbines

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SSRN 2023年

作者： Wang, Ying Huang, ShengXian Yan, Hua Qiu, HuiHe Shanghai key laboratory of multiphase flow and heat transfer of power engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong

关键词： Airfoils

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Numerical simulation on filling process of drag reduction agent in natural gas pipeline 5

Numerical simulation on filling process of drag reduction ag...

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2021 5th International Conference on Fluid Mechanics and Industrial Applications, FMIA 2021

作者： Yin, Xiaoyun Jing, Jiaqiang Jing, Peiyu Sun, Jie Yuan, Ying School of Oil and Natural Gas Engineering Southwest Petroleum University Chengdu China Oil and Gas Fire Protection Key Laboratory of Sichuan Province Chengdu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an China

In this paper, a numerical simulation is established to model the filling process of atomized natural gas drag reduction agent (DRA) at the pipeline inlet section. The computations are on the basis of the Euler-Lagrange method with the standard k-ϵ turbulence model. The effects of atomizing parameters on the droplets Sauter Mean Diameter (SMD) and the adsorption performance on the wall of pipe are investigated using the validated model. The results show that nozzle diameter and nozzle angle have little effect on the SMD of DRA droplets, whereas the size of the droplets SMD reduces with the increase of atomizing pressure, and the influence of atomizing flow rate is just the opposite. © Published under licence by IOP Publishing Ltd.

关键词： Drops

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The Enriched-Embedded Discrete Fracture Model (Nedfm) for Fluid flow in Fractured Porous Media

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SSRN 2023年

作者： Jiao, Kaituo Han, Dongxu Chen, Yujie Bai, Bofeng Yu, Bo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi’an710049 China School of Mechanical Engineering Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development Beijing Institute of Petrochemical Technology Beijing102617 China

The embedded discrete fracture model (EDFM) is widely adopted for fluid flow in fractured porous media, but it cannot be employed for blocking fractures due to the assumption of symmetric and linear pressure distribution around fractures. To improve it, this work presents a novel numerical framework named the enriched-embedded discrete fracture model (nEDFM). It is based on the non-conforming grid and discretized by the mass-conservative finite volume method. Attractively, the nEDFM applies to both conductive and blocking fractures, as well as isotropic and anisotropic matrix permeability, while maintaining a low computational cost. The local shape function, which introduces two enriched degrees of freedom for every fracture cell, is developed to model the discontinuities of pressure and its gradient on two sides of the fracture. Correspondingly, two equations for coupling the matrix and reduced fracture are supplemented to close the system and improve the accuracy of mass exchange between the matrix and fracture. The performance of nEDFM is compared with the classical EDFM and projection-based EDFM (pEDFM). The results show that the nEDFM outperforms the EDFM for conductive fractures and can obtain better pressure distribution inside blocking fractures than the pEDFM. For anisotropic matrix permeability with conductive or blocking fractures, the nEDFM can get solutions comparable to those obtained by the reference solution. Hence, the nEDFM is an accurate and flexible method for fluid flow simulation in fractured porous media. © 2023, The Authors. All rights reserved.

关键词： Fracture

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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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