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CFD and FEM combined study on the solid particle erosion damage of multi-stage compressor blades

Powder Technology 2025年

作者： Hongkun Zhan Yanfang Hou Liuxi Cai Jiaming He Yun Li Shunsen Wang Juan Di School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 PR China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China School of Vehicle and Traffic Engineering Taiyuan University of Science and Technology Taiyuan 030024 PR China

Dust and sand particles in the air can cause serious erosion damage to the titanium alloy blades of the compressor, significantly reducing the working life of the engine. To study the erosion mechanism of solid particles on multi-stage compressor blades in detail, first, CFD gas-solid two-phase flow numerical simulation method is employed to study the motion and impact behavior of quartz sand particles in the compressor flow channel, which clarify the macroscopic mechanism of particle erosion damage on the blades and determine the particle impact parameters. Then, the microscopic erosion damage mechanism of titanium alloy blades is studied through an improved FEM method. Considering the characteristics of multiple particle impingement, random particle shape, random impingement position, and repetitive erosion process during the impact process, a three-dimensional multi-particle random cyclic impact finite element calculation model is established for the first time. On the basis, coupled analysis of the characteristics of material microdamage morphology, system energy conversion and dissipation, and target material erosion weight loss is conducted to reveal the dynamic erosion damage mechanism of multi-particle impacting titanium alloys. Finally, the influences of factors such as the impact velocity, impact angle, and particle shape on the dynamic erosion damage behavior of titanium alloy targets were explored.

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On-Line Measurement of Ultralow Mass Concentration Particulate Based on Light Scattering Coupled with Beta Ray Attenuation Method

SSRN

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SSRN 2022年

作者： Liu, Xiaowei Huang, Yubo Wang, Zhaofeng Jiang, Meng Zhou, Zijian Xu, Minghou Han, Jinke Yang, Bin Fan, Xinfeng State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China JXIC Energy Technology Research Institure Nanchang330000 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Wuhan Tianhong Environmental Protection Industry Co. Ltd Yuhong Environmental Protection Science and Technology Industrial Park No.11 Huashiyuan North Road Miaoshan District Donghu high tech Development Zone Wuhan430074 China

Light scattering method is the most commonly used method for on-line measurement of ultralow particulate matter mass concentration. However, when the particle characteristics change, the effectiveness of the empirical relationship decreases, which would lead to a sizeable deviation. To accurately measure the mass concentration of particulate matter in real-time, a coupling measurement idea of light scattering and beta-ray attenuation is proposed. The beta-ray attenuation is little affected by particle properties and accurately reflects the average PM mass concentration in the measured period. The single calibration method (M1), periodic calibration method (M2), average calibration method (M3), and asymmetric factor calibration method (M4) are formed based on the coupling idea. The results of all methods are perfect when the particle size is unchanged. However, when the particle sizes fluctuate frequently, the results of M1, M2, and M3 deviate seriously from the actual value, and the applicable working conditions have limitations. The results of M4 are in good agreement with the actual value, and the effectiveness is not limited by the particle size. Finally, the prototype based on experimental exploration was developed and had been continuously operated for more than 528 hours at a 1000 MW unit of a coal-fired power plant. © 2022, The Authors. All rights reserved.

关键词： Particle size

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Particle-Scale Modelling of Injected Hydrogen and Coke Co-Combustion in the Raceway of an Ironmaking Blast Furnace

SSRN

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SSRN 2022年

作者： Dianyu, E. Zhou, Peng Ji, Langyong Cui, Jiaxin Xu, Qiang Guo, Liejin Yu, Aibing International Institute for Innovation Jiangxi University of Science and Technology Ganzhou341000 China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Ganzhou341000 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China ARC Research Hub for Computational Particle Technology Department of Chemical Engineering Monash University VIC3800 Australia Centre for Simulation and Modelling of Particulate Systems Southeast University Monash University Joint Research Institute Suzhou215123 China

Hydrogen is an environmentally friendly fuel that does not produce greenhouse gas (GHG) emissions. Its applications have attracted significant attention from many industries, especially the ironmaking industry, which consumes massive amounts of fossil energy. The injection of hydrogen into a blast furnace (BF) is one of the most promising low-carbon ironmaking routines. In this study, an experimentally validated CFD-DEM model is adopted to investigate the dynamics, microstructure and thermochemical behaviours in the raceway of a BF with hydrogen injection operations (HIOs), which include raceway evolution, force distribution and the co-combustion characteristics of hydrogen and coke. Some significant features are obtained through comparison analyses between HIOs and air injection operations (AIOs). In particular, the effects of the hydrogen injection concentration on the raceway size, gas temperature and components are studied. The simulation results show that a smaller raceway is formed under HIOs in comparison with that of AIOs. In addition, the gas temperature is higher near the tuyere but lower along the tuyere axis, and the oxygen consumption is larger and produces more CO. As the hydrogen injection concentration increases: (i) the raceway size and gas temperature decrease;(ii) the CO is generated at the early stage and the maximum CO2 concentration moves to inlet direction along the tuyere axis. The results provide insights on the fundamental understanding of low-carbon ironmaking BF technology. © 2022, The Authors. All rights reserved.

关键词： Blast furnaces

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Solid-state anaerobic co-digestion of highland barley straw, food waste, and yak manure:Co-digestion performances and microbial characteristics analysis

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Renewable Energy 2025年 252卷

作者： Bao, Rui Feng, Jiaqi Feng, Wenli Li, Xiujin Lu, Xuebin Zuo, Xiaoyu Liu, Rufei Yuan, Hairong State Key Laboratory of Chemical Resource Engineering Department of Environmental Science and Engineering Beijing University of Chemical Technology Beijing100029 China Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power Engineering Xi'an Jiaotong University 28 Xianning West Road Shanxi Province Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University 28 Xianning West Road Shaanxi Province Xi'an710049 China Key Laboratory of Environmental Engineering and Pollution Control on the Plateau of Tibet Autonomous Region School of Ecology and Environment Tibet University Lhasa Tibet 850000 China School of Environmental·Science and Engineering Tianjin University Tianjin300350 China CUCDE Environmental Technology CO. LTD. Beijing100120 China

Co-digestion performances and microbial characteristics were investigated at solid-state anaerobic co-digestion system for highland barley straw (HBS), food waste (FW) and yak manure (YM). The different mixing ratios of HBS, FW, and YM were set according to the total solid content of different substrates. The results showed that the highest methane was 465.9 mL/g VS when the ratio of HBS:FW:YM was 0:5:1(HFY051), which was 4.5 %–102.6 % higher than those of co-digestion groups, HBS, and YM. The synergistic effect of co-digestion for different substrates contributed 6.3 %–123.1 % to improving methane yields in the first 25 days. Clostridium_sensu_stricto 1 and Fastidiosipila were the key bacterials and Methanosarcina and Methanobacterium were dominant methanogens at genus levels for different experimental groups. LEfSe indicated that 26 species have a great impact on co-digestion experimental groups. Therefore, solid-state anaerobic co-digestion of HBS, FW, and YM could improve the co-digestion performances and achieve higher methane yield. © 2025

关键词： Clostridium

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A subcooled boiling model developed for narrow rectangular channels based on the CFD method 18

A subcooled boiling model developed for narrow rectangular c...

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18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019

作者： Li, Linfeng Wang, Mingjun Zhang, Dalin Tian, Wenxi Su, G.H. Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

The accurate prediction of subcooled boiling phenomena in narrow rectangular channels is of great importance for the plate type fuel reactor core safety analysis during some critical scenarios. Serious of experimental studies on subcooled boiling in narrow rectangular channels indicate that a bubble may slide on the heating surface after nucleation and then lift to the main flow, merging with not-yet-fully-grown bubble and disrupting local boundary layer. In this paper, the influence of sliding bubbles is taken into consideration in wall boiling model and implanted into the CFD code to simulate boiling in narrow rectangular channel. Bubble dynamics is used in calculating the relevant bubble diameters during ebulletin cycle. The feasibility of this proposed model is validated with existed experimental data by comparing wall superheat. This work could promote the development of CFD two-phase flow simulation capacity in the plate type fuel nuclear reactor. © 2019 American Nuclear Society. All rights reserved.

关键词： Computational fluid dynamics

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Low to intermediate temperature ignition delay times of nitromethane 12

Low to intermediate temperature ignition delay times of nitr...

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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Yang, Meng Tang, Chenglong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road Xi'an Shaanxi710049 China

In this work, the auto-ignition experiments of nitromethane at the low to intermediate temperature, fuel concentration of 2%, pressure of 30 bar and different equivalence ratios have been investigated by using rapid compression machine. The pressure profiles of nitromethane ignition were observed. Results show that a distinct two-stage heat release process is found at ? = 0.5. And multi-stage heat release is also observed with temperature decreasing. Subsequently, the effect of equivalence ratio on the nitromethane ignition is performed. The results show that the dependence of nitromethane ignition on the equivalence ratio is weak. In addition, the experimental data are used to validate the recent developed mechanisms of nitromethane. Relative large deviations are observed between experiments and predictions. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

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Performance of cone meter for measuring cryogenic fluid considering cavitation

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International Journal of Fluid Machinery and Systems 2019年第1期12卷 12-21页

作者： He, Denghui Chang, Zhuang Bai, Bofeng Chen, Senlin Guo, Pengcheng State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi’an University of Technology NO.5 South Jinhua Road Xi’an710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China

The performance of the cone meter when measuring the cryogenic fluid was investigated by numerical simulation. The results show that the discharge coefficient and pressure loss coefficient of the cone meter are almost constant when the Reynolds number in the "stable region". The cryogenic fluids, especially the liquid hydrogen, have wider stable Reynolds number ranges than the water. There is little effect of cavitation on the discharge coefficient and pressure loss coefficient at the initial stage of cavitation. Thus the effect of slight cavitation on the measurement error of the flow rate is small, whose relative error is less than ±0.5% in present cases. This study opens a new avenue for measuring the flow rate of the cryogenic fluid. © 2019, Turbomachinery Society of Japan. All rights reserved.

关键词： Cavitation

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Combustion and heat transfer characteristics of a 300 MW pulverized-coal boiler retrofitted with biogas co-combustion

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Thermal Science and engineering Progress 2025年

作者： Fengxia An Fanhui Shen Zhaoping Zhong Yunan Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China China Energy Science and Technology Research Institute Co. Ltd. Nanjing 210023 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Biomass co-combustion is an important measure to reduce the carbon dioxide emissions for pulverized-coal boilers. However, little work has been done to reveal the change in the heat transfer performance of retrofitted boilers. In this paper, the heat transfer process of furnace heating surfaces in a 300 MW pulverized-coal boiler with biogas co-combustion is invested by numerical simulation which combines the three-dimensional (3D) CFD model for combustion and heat transfer process of flue gas and the one-dimensional (1D) analytical model for the working fluid. The following conclusions can be drawn: the completeness of fuel combustion will be improved when biogas is injected into the furnace, and the peak concentration of carbon monoxide (CO) in the primary combustion zone decreases from 2.5 % to 0.93 % when the biogas co-combustion ratio increases from 0 % to 30 %, indicating that the risk of high-temperature corrosion on the water wall can be reduced. The 30 % biogas co-firing scheme with the biogas injection positions being both SA-1 and SOFA-3 is best in all cases studied in this work, because the temperature in the furnace and the heat transfer between the flue gas and the working fluid are most uniform, which contributes to the high boiler efficiency, low thermal NO x formation and good flexibility. Co-combusting 30 % biogas can increase the outlet working fluid dryness from 0.39 to 0.53 at the outlet of waterwalls, leading to an increase in the heat absorption in the furnace and a decrease in heat absorption at the tail convective heating surfaces, which should be considered carefully in the operation of the biogas co-combustion boilers. The research findings of this paper will provide technical support for the operation and control of pulverized-coal boilers co-firing biogas.

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Combining Core-Shell Construction with Alloying Effect for High Efficiency Ethanol Electrooxidation: A Case of Core-Shell Au@Fepd Nanoparticles with Sub-Nano Alloy Shells

SSRN

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SSRN 2020年

作者： Liu, Danye Zeng, Qing Liu, Hui Hu, Chaoquan Chen, Dong Xu, Lin Yang, Jun State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemistry and Materials Science Jiangsu Key Laboratory of New Power Batteries Nanjing Normal University Nanjing210023 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

Combining the core-shell construction with an alloying effect is an effective way to optimize the electronic and lattice strain effects generated in core-shell configurations for achieving highly catalytic efficiency for a given electrochemical reaction. To demonstrate this concept, we herein report the use of core-shell Au@FePd nanoparticles with an Au core and a sub-nano FePd alloy shell to promote the electrocatalytic oxidation of ethanol. In these core-shell structures, the Au core modifies the electronic configuration of Pd atoms through differences in electronegativity, while the Fe component in thin shells reduces the lattice expansion of Pd induced by the Au core, both of which endows the Pd shell with an appropriate d-band center, favorable for the electrooxidation of ethanol molecules through C1 pathway. In particular, the as-prepared core-shell Au@FePd nanoparticles at an optimized Fe/Pd ratio of 0.5/1 (Au@FePd-0.5) exhibit a mass activity of 13.3 A mg-1 and a specific activity of 20.2 mA cm-2 for the ethanol electrooxidation in an alkaline medium, which significantly outperform those of a majority of the recent reported Pd-based electrocatalysts. This study highlights the concept of engineering the geometry and surface composition of a nanostructure for designing highly efficient electrocatalysts for a large variety of electrochemical applications. © 2020, The Authors. All rights reserved.

关键词： Shells (structures)

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MHD Simulations Preliminarily Predict The Habitability and Radio Emission of TRAPPIST-1e

arXiv

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arXiv 2025年

作者： Wang, BoRui Ye, ShengYi Varela, J. Luo, XinYi Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen518055 China Institute for Fusion Studies University of Texas AustinTX78712 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

Context. As the closest Earth-like exoplanet within the habitable zone of the M-dwarf star TRAPPIST-1, TRAPPIST-1e exhibits a magnetic field topology that is dependent on space weather conditions. Variations in these conditions influence its habitability and contribute to its radio emissions. Aims. Our objective is to analyze the response of different terrestrial magnetosphere structures of TRAPPIST-1e to various space weather conditions, including events analogous to coronal mass ejections (CMEs). We assess its habitability by computing the magnetopause standoff distance and predict the resulting radio emissions using scaling laws. This study provides some priors for future radio observations. Methods. We perform three-dimensional magnetohydrodynamic (MHD) simulations of the TRAPPIST-1e system using the PLUTO code in spherical coordinates. Assuming TRAPPIST-1e possesses various Earth-like magnetospheres, we analyze the impact of four distinct space weather conditions on its magnetospheric topology. The space weather parameters range from sub-Alfvénic conditions to CMEs. Results. Our analysis indicates that the predicted habitability and radio emission of TRAPPIST-1e strongly depend on the planet’s magnetic field intensity and magnetic axis inclination. Within sub-Alfvénic, super-Alfvénic, and transitional stellar wind regimes, the radio emission intensity positively correlates with both planetary magnetic field strength and axial tilt, while planetary habitability, quantified by the magnetopause standoff distance, shows a positive correlation with magnetic field strength and a negative correlation with magnetic axis tilt. If TRAPPIST-1e possesses a magnetic field strength and axial tilt comparable to Earth’s (∼ 0.32G and ∼ 23.5◦). its magnetosphere can effectively shield the planetary surface from stellar wind erosion even under severe space weather conditions (e.g., CME events). However, for larger axial tilts (∼ 45◦), a stronger planetary magnetic field would be

关键词： Plasma magnetohydrodynamic waves

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