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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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Au@SiO_2 core/shell nanoparticle-decorated TiO_2 nanorod arrays for enhanced photoelectrochemical water splitting

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Chinese Science Bulletin 2014年第18期59卷 2191-2198页

作者： Jianan Chen Miao Yu Yuhao Wang Shaohua Shen Meng Wang Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong University School of Chemical Engineering and Technology Harbin Institute of Technology

To improve the separation efficiency of photoinduced charge carries,Au@SiO2nanoparticles(NPs)with core–shell structure were loaded onto the surface of TiO2nanorods grown on fluorine-doped tin oxide substrate by a facile two-step *** resulted Au@SiO2/TiO2photoanodes were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,as well as photoelectrochemical *** with pristine TiO2nanorod film,the Au@SiO2/TiO2films showed remarkable enhancement in photoelectrochemical water splitting,with incident photonto-current conversion efficiency increasing from 31%to37%at 380 nm at 0.7 V versus saturated calomel *** could be interpreted by the effect of metallic surface plasmon resonance of Au@SiO2NPs,which would generate an intense electromagnetic field with spatially nonhomogenous distributed *** a result,the charge carriers generated in the near-surface region of TiO2nanorods could be easily *** modification method based on the effect of metallic surface plasmon resonance for promoted charge carrier separation provides a promising way to develop semiconductor photoelectrodes with high solar water-splitting performance.

关键词：二氧化硅纳米粒子二氧化钛纳米棒电解水表面等离子体共振效应纳米颗粒金属 TiO2薄膜

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Base-or acid-assisted polystyrene plastic degradation in supercritical CO_(2)

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Waste Disposal and Sustainable Energy 2023年第2期5卷 165-175页

作者： Yanbing Liu Jinwen Shi Liuhao Mao Bingru Lu Xing Kang Hui Jin International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong University28 West Xianning RoadXi’an710049ShaanxiChina

Plastic has caused serious"white pollution"to the environment,and the highly inert characteristics of plastic bring a major challenge for *** fluids have unique physical properties and have been widely used in various *** this work,supercritical CO_(2)(Sc-CO_(2))with mild conditions was selected and assisted by NaOH/HCl solution to degrade polystyrene(PS)plastic,and the reaction model was designed using response surface methodology(RSM).It was found that,regardless of the types of assistance solutions,the factors affecting PS degradation efficiencies were reaction temperature,reaction time,and NaOH/HCl *** the temperature of 400℃,time of 120 min,and base/acid concentration of 5%(in weight),0.15 g PS produced 126.88/116.99±5 mL of gases with 74.18/62.78±5 mL of H2,and consumed 81.2/71.5±5 mL of CO_(2).Sc-CO_(2)created a homogeneous environment,which made PS highly dispersed and uniformly heated,thus promoting the degradation of ***,Sc-CO_(2)also reacted with the degradation products to produce new CO and more CH_(4)and C_(2)H_(x)(x=4,6).Adding NaOH/HCl solution not only improved the solubility of PS in Sc-CO_(2),but also provided a base/acid environment that reduced the activation energy of the reaction,and effectively improved the degradation efficiencies of *** short,degrading PS in Sc-CO_(2)is feasible,and better results are obtained with the assistance of base/acid solution,which can provide a reference for the disposal of waste plastics in the future.

关键词： Plastic degradation Polystyrene Supercritical CO_(2) NaOH HCl

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NUMERICAL SIMULATION OF FLUID-STRUCTURE COUPLING FOR THE MAIN PUMP OF LEAD COOLED FAST REACTOR 30

NUMERICAL SIMULATION OF FLUID-STRUCTURE COUPLING FOR THE MAI...

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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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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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Experimental study on a linear concentrating solar photovoltaic/thermal system

Experimental study on a linear concentrating solar photovolt...

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

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

A set of solar photovoltaic and thermal combined (PV/T) system is installed and tested in the present study. The PV/T system is designed and constructed by integrating coiled-channel flat-plate collectors with polycrystalline silicon PV modules. The linear Fresnel lens acts as the concentrator. Three systems, i.e. the non-cooling PV system, the non-concentrating PV/T system and the concentrating PV/T system, are tested and analyzed. Experimental results show that a high thermal and electrical combined efficiency, over 65%, is achieved by the PV/T system. Water in the flat plate can significantly decrease the PV module temperature and improve the electricity-conversion efficiency. Comparing with the non-concentrating PV/T system, the concentrating PV/T system can increase the total utilization of solar energy.

关键词： Solar energy

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Dynamic simulation of coal-fired power plant integrated with trough solar collector operating in parallel with high pressure heaters

Dynamic simulation of coal-fired power plant integrated with...

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2019 Canadian Society for Civil engineering Annual Conference, CSCE 2019

作者： Yan, Hui Li, Xin Liu, Ming Chong, Daotong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9780791883747

Solar-aided coal-fired power plant (SACFPP) is a costeffective approach to overcome solar energy intermittency. SACFPPs frequently operate in dynamic processes due to power load and solar energy fluctuations. This study investigated the dynamic characteristics of SACFPPs;such characteristics are important for flexibility evaluation and control system design. The SACFPP used in this study was based on a 660 MW coalfired power plant, and a trough collector system (TCS) operates in parallel with high pressure (HP) heaters. After model development and validation, the dynamic performance of the SACFPP was analyzed under four load ratios of power plant, with disturbances of two parameters: direct normal irradiance (DNI) and mass flowrate ratio to TCS. The performance was also compared with three parallel TCS connection modes. Results showed that the magnitude and response time for power variation under DNI disturbance increased with load ratio. With 500 W/m2 DNI step increments, power increased by approximately 18.4, 21.2, 24.7, and 29.8 MW in 2200, 2330, 2550 and 2620 s at 70%, 80%, 90%, and 100% load ratios, respectively, when all the HP heaters were replaced. The serial number and the number of HP heaters replaced also increased the power variation and response time. Under mass flowrate ratio to TCS increase disturbance, the power rapidly changed to its maximum and then slowly decreased, but the variation value depended on the load ratio. Copyright © 2020 ASME.

关键词： Coal fired power plant

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Research on the effects of diluents and dilution ratios on laminar burning velocities and flame instabilities of hydrogen flame 11

Research on the effects of diluents and dilution ratios on l...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Lu, Xin Hu, Erjiang Li, Xiaotian Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Laminar burning velocities and flame instabilities of H2/O2/diluents mixture were studied at initial pressure of 0.3 MPa, initial temperature of 373 K and equivalence ratio of 1.0. The He diluted mixtures have the largest laminar burning velocities and the N2 diluted mixtures have the smallest, while He diluted mixtures have the largest mole fraction of H and OH radical and N2 diluted mixtures have the smallest. And laminar burning velocities fall when the dilution ratio rises, due to the mole fractions of H and OH radical fall with increasing dilution ratio. The cellular structure appeared on both N2 and Ar diluted mixture, while only wrinkles grew on He diluted mixtures. When dilution ratio rose, the appearance of cellular structure deferred. Thus, He diluted mixtures are more stable than N2 and Ar diluted mixtures, and higher dilution ratios restrain the flame instabilities. © 2017 Combustion Institute. All rights reserved.

关键词： Hydrogen

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Experimental and modeling study of n -butanol oxidation at high temperature

Experimental and modeling study of n -butanol oxidation at h...

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作者： Zhang, Jiaxiang Wei, Liangjie Man, Xingjia Jiang, Xue Zhang, Yingjia Hu, Erjiang Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Ignition delay times of n-butanol/oxygen diluted with argon were measured behind reflected shock waves. Experiments were carried out in the temperature range 1200-1650 K, at 2 and 10 atm, and at equivalence ratios of 0.5, 1.0, and 2.0. Correlations of ignition delay times were constructed on the basis of measured data through multiple linear regression. A modified kinetic model for the oxidation of n-butanol at high temperature was developed, based on previous models by adding and modifying some key reactions. The modified model shows good prediction of the measured data under all measured conditions. This model was also validated against jet-stirred reactor (JSR) data obtained from the literature, and fairly good agreement was observed. A fair improvement on the simulation of aldehydes (acetaldehyde and butyraldehyde) was found compared to the original model. Finally, reaction pathway and sensitivity analysis indicate that the H-abstraction reactions play a dominant role in the consumption of n-butanol, while unimolecular decomposition reactions become more important with increasing temperature. High-level accurate investigation of the rate constants of H-abstraction reactions and unimolecular decomposition reactions is required to further improve n-butanol oxidation kinetics. © 2012 American Chemical Society.

关键词： Oxidation

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Pulse laser induced microbubble motion dynamic in a nanofluid pool

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Physics of Fluids 2025年第5期37卷

作者： Yan, Xin Xu, Jinliang Zhang, Yuqian Wang, Hongbiao Liu, Guohua Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power University Ministry of Education Beijing102206 China

Understanding bubbles motion dynamic with laser interaction is crucial for applications in boiling heat transfer enhancement, precision laser surgery, and cell manipulation. Here, we investigate the micro-bubbles motion dynamic with pulsed laser irradiation. A horizontally projected pulse laser induces the generation of vapor micro-bubbles in nanofluids via plasmonic absorption effects. Parametric variation in pulse energy and laser frequency reveals four distinct bubble flow regimes: (1) microbubble streaming, (2) frequency-regulated bubble orbital motion, (3) bubble self-rotation, and (4) bubble translation combined rotational motion. The frequency-regulated bubble orbital trajectory forms a triangular shape with oscillation amplitudes spanning 16.9-65.0 µm in the x-direction and 21.8-115.7 µm in the y-direction. The angular velocity of bubble self-rotation is about 13.2-20.3 rad/s. By force analysis, we identify Marangoni forces arising from thermal gradients and indirect light pressure resulting from asymmetric laser heating as dominant actuation mechanisms. At low frequencies, spatiotemporal characteristics of Marangoni forces enable bubble self-sustained orbital revolution. Conversely, high-frequency laser irradiation induces stationary bubble confined by Marangoni forces and buoyancy. The laser eccentrically irradiates the bubble, which induces indirect light pressure that drives the bubble's self-rotation. This study revolutionizes bubble motion manipulation by using pulsed lasers, thus enabling precise microfluidic operations. The introduction of laser-guided bubble motion can enhance heat transfer and facilitate advanced mixing and reagent management in chemical processes. © 2025 Author(s).

关键词： Laser surgery

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