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Development and application of a throughflow method for high-loaded axial flow compressors

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Science China(Technological Sciences) 2016年第1期59卷 93-108页

作者： LI Bo GU Chun Wei LI Xiao Tang LIU Tai Qiu XIAO Yao Bing Key Laboratory for Thermal Science and Power engineering of Ministry of Education Department of Thermal EngineeringTsinghua UniversityBeijing 100084China Shenyang engine Design and Research institute Shenyang 110015China Collaborative Innovation Center of Advanced Aero-engine Beijing 100191China

In this paper, a novel engineering platform for throughflow analysis based on streamline curvature approach is developed for the research of a 5-stage compressor. The method includes several types of improved loss and deviation angle models, which are combined with the authors' adjustments for the purpose of reflecting the influences of three-dimensional internal flow in high-loaded multistage compressors with higher accuracy. In order to validate the reliability and robustness of the method, a series of test cases, including a subsonic compressor P&W 3S1, a transonic rotor NASA Rotor 1B and especially an advanced high pressure core compressor GE E^3 HPC, are conducted. Then the computation procedure is applied to the research of a 5-stage compressor which is designed for developing an industrial gas turbine. The overall performance and aerodynamic configuration predicted by the procedure, both at design- and part-speed conditions, are analyzed and compared with experimental results, which show a good agreement. Further discussion regarding the universality of the method compared with CFD is made afterwards. The throughflow method is verified as a reliable and convenient tool for aerodynamic design and performance prediction of modern high-loaded compressors. This method is also qualified for use in the further optimization of the 5-stage compressor.

关键词： throughflow method multi-stage compressor high-loaded loss and deviation angle models streamline curvature aerodynamic design performance prediction

Design and experiments of plasma jet igniter for aeroengine

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Propulsion and Power Research 2013年第3期2卷 188-193页

作者： Yubo Guan Guorui Zhao Xinying Xiao AVIC Shenyang engine Design and Research institute ShenyangLiaoning 110000China

A plasma jet ignition technology was studied for aeroengine *** advantages of compact stnucture and advanced performance of air-cooled plasma jet igniter had been tested and verified in the opening *** plasma jet igniter could produce a continuous plasma jet,stable and reliable *** influence factors of plasma jet ignition aerodynamic and structure were studied in the opening *** plasma jet was closely related to inlet pressure and flow,simultaneously to the igniter nozzle geometry and throat *** on the stable continuous plasma jet,some methods were explored in order to reduce plasma output power,optimize the structure design,and improve the thermal *** plasma jet igniter applied to aeroengine combustor was identified *** combustion chamber with the igniter,altitude ignition performance were experimented for the inlet pressure of plasma ignition from 10 kPa to 50 kPa,the flow of plasma jet not more than 0.20 g/s,and energy output of ignition from 800 W to 1500 *** test results were compared with that of conventional aeroengine high energy ignition *** results show that the plasma jet igniter is better than the conventional one.

关键词： Aeroengine Plasma Igniter Jet Ignition

Characterization of Swirling Inflow Effects on Turbine Performance under Pulsating Flows

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Journal of Thermal Science 2022年第5期31卷 1734-1744页

作者： DING Zhanming WANG Cuicui ZHANG Junyue LIU Ying HOU Linlin ZHUGE Weilin ZHANG Yangjun Science and Technology on Diesel engine Turbocharging Laboratory China North Engine Research InstituteTianjin300400China Kangyue Technology(Shandong)Co. LtdShouguangShandong262718China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China

The present study focuses on the influence of the swirling flows on flow behaviors and performance of a radial-flow turbocharger turbine under pulsating inflow *** characterize the effects of swirling flow,three sets of simulations of the turbine were carried out,which are an unsteady simulation under pulsating swirling inflow,an unsteady simulation under equivalent pulsating uniform inflow,and quasi-steady simulations under uniform *** proved that swirling flow has a considerable negative influence on turbine instantaneous performance and lead to 2.5%cycle-averaged efficiency reduction under pulsating flow *** inflow would lead to significant losses in both the volute and the rotor,while the pulsating inflow leads to higher losses in the rotor and shows little influence on the losses in the *** instantaneous efficiency reduction of the turbine could be correlated with the time-varying inlet swirl *** the influence of unsteady inlet swirls,the volute flow field is highly distorted and the free vortex relation is no longer *** swirling flow has strong interactions with the wake flow of the volute tongue,leading to additional *** flow angle at rotor inlet is remarkably reduced and its distribution is significantly *** separation flows and passage vortices would appear in the rotor because of the swirling inflow,leading to inferior rotor performance.

关键词： swirling inflow pulsating flow CFD turbocharger turbine internal combustion engine

Overview of Precious Metal Content Analysis Methods in Automotive Catalytic Converter

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Journal of Materials Science and Chemical engineering 2023年第11期11卷 7-14页

作者： Xianpeng Yang Chengbao Xie Ning Liu Xin Du Suqing Wang Huasheng Jiang Zhengang Zhang Department of National internal combustion engine Industry Measuring and Testing Center Weifang China Department of Weichai Power Co. Ltd. Weifang China

With the increasing awareness of environmental protection, people’s concern of pollution issues arising. Vehicles, as the most important means of transportation, its exhaust emission has received considerable attention. The catalytic converter is able to purify harmful substances in exhaust gas. The absolute content of precious metals in the catalytic converter dominates the exhaust gas purification effect. Accurate detection of precious metal content is of great significance for controlling the cost of catalysts, ensuring catalytic performance and recovering precious metals from spent catalysts. We herein summarized several instruments for precious metals content exploration, such as X-ray fluorescence spectrometer (XRF), atomic absorption spectrometer (AAS), inductively coupled plasma emission spectrometer (ICP) and spectrophotometer. In this thesis, the feasibility of using various devices for characterizing precious metal content in catalytic converters is analyzed and their strengths or weaknesses are elaborated.

关键词： Catalytic Converter Precious Metal Content Analysis Methods

Morphology,Nanostructure,and Oxidation Reactivity of Particulate Matter Emitted by Diesel Blending with Various Aromatics

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 1-9页

作者： Yang He Li Bo Liu Shuntao Wang Yajun Zhang Ran Guo Lingyan SINOPEC Research institute of Petroleum Processing Co. Ltd.Beijing 100083 State Key Lab of engine Reliability WEICHAI Company

This study aims to analyze the influence of the polycyclic aromatic hydrocarbon(PAH)content in diesel on the physical and chemical properties of diesel soot *** diesel fuels with different PAH content were tested on a 11.6 L direct-injection diesel *** raw particulate matter(PM)before the after-treatment devices was collected using the thermophoresis sampling system and the filter sampling system.A transmission electron microscope and Raman spectrometer are used to analyze the physical properties of the soot particles,including morphology,primary particle size distribution,and graphitization degree.A Fourier transform infrared spectrometer and thermogravimetric analyzer are used to characterize the surface chemical composition and oxidation reactivity of soot particles,*** results show that as the PAH content in the fuel decreases,the size of the primary soot particles decreases from 29.58 to 26.70 *** graphitization degree of soot particles first increases and then decreases,and the relative content of the aliphatic hydrocarbon functional groups of soot particles first decreases and then *** T_(10),T_(50),and T_(90) of soot from high-PAH fuel are 505.3,589.3,and 623.5℃,while those from low-PAH fuel are 480.1,557.5,and 599.2℃,*** indicates that exhaust PM generated by the low-PAH fuel has poor oxidation ***,as the PAH content in fuel is further decreased,the excessively high cetane number may cause uneven mixing and incomplete combustion,leading to enhanced oxidation reactivity.

关键词： particulate matter aromatics morphology nanostructure oxidation reactivity

Fatigue Life Prediction of Horizontal Press Frame Based on Statistical Probability and Its Redesign

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Journal of Harbin institute of Technology(New Series) 2014年第2期21卷 43-49页

作者： Wei-Wei Zhang Xiao-Song Wang Bo Yang Shi-Jian Yuan School of Materials Science and engineering Harbin Institute of Technology AVIC Shenyang Liming Aero-engine Group Co. Ltd

Horizontal press as an important part of hydro-forming machine is used to output the horizontal force to keep the high internal pressure during tube hydro-forming. However,the horizontal press frame is usually mounted on the press bed and not pre-stressed. Meanwhile it will be subjected to the reaction force caused by liquid pressure. Stresses are concentrated severely on the assemble region due to deformation,and total fatigue life will decrease. In order to predict the total fatigue life of the frame,the simulations are used firstly to determine to stress concentration region,and then strain gauge measurements are carried out under different loads. Next,the methods of statistical probability are conducted to calculate the fatigue life based on long-term load history. Finally a structure with the considerable longer fatigue life is redesigned.

关键词： horizontal press statistical probability fatigue life prediction structure redesign

Bifurcation behaviors of catalytic combustion in a micro-channel

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Journal of Thermal Science 2008年第1期17卷 84-89页

作者： Wen Zeng Maozhao Xie Hongan Ma Wei Xu School of Aero-engine and Energy engineering Shenyang Institute of Aeronautical Engineering Shenyang 110034China School of Energy and Power engineering Dalian University of Technology Dalian 116024 China

Bifurcation analysis of ignition and extinction of catalytic combustion in a short micro-channel is carded out with the laminar flow model incorporated as the flow model. The square of transverse Thiele modulus and the residence time are used as bifurcation parameters. The influences of different parameters on ignition and extinction behavior are investigated. It is shown that all these parameters have great effects on the bifurcation behaviors of ignition and extinction in the short micro-channel. The effects of flow models on bifurcation behaviors of combustion are also analyzed. The results show that in comparison with the flat velocity profile model, for the case of the laminar flow model, the temperatures of ignition and extinction of combustion are higher and the unsteady multiple solution region is larger.

关键词： catalytic combustion bifurcation theory short monolith

Reduction of Transient engine-Out NO_(x)-Emissions by Advanced Digital combustion Rate Shaping

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Automotive Innovation 2020年第2期3卷 181-190页

作者： Daniel Neumann Lukas Schäfers Paul Muthyala Jakob Andert Stefan Pischinger institute for combustion engines RWTH Aachen UniversityAachenGermany FEV Consulting GmbH Neuenhofstraße 18152078 AachenGermany

Modern diesel passenger cars already fulfill high demands regarding the reduction in NOx emissions through complex exhaust aftertreatment *** the consideration of real driving emissions,the reduction in NOx emissions in high transient engine operation becomes even more *** from increasing the complexity of exhaust aftertreatment systems,internal engine measures play a major *** approach to reducing NOx emissions described in this paper uses the precise control of the *** this purpose,the method of digital combustion rate shaping control is applied,which allows the realization of a predefined combustion by automatically adapting the injection profile during *** this work,this controller is extended in order to control the predefined combustion trace based on target NOx ***,the working principal of the state-of-the-art digital combusting rate shaping controller is *** the next step,the design and strategy of the extended control approach are explained and ***,its potential to reduce engine-out NOx emissions during transient driving situations is evaluated based on simulations of the *** is shown that the control concept fulfills the requirements and is able to effectively reduce high NOx peaks during transient operation.

关键词： Diesel engine Emission control combustion rate shaping Closed loop combustion control NO_(x)Control

Design and combustion Characteristic Analysis of Free Piston Stirling engine External combustion System

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Journal of Shanghai Jiaotong university(Science) 2018年第S1期23卷 50-55页

作者： JIN Xudong LV Tian YU Guoyao LIU Jiawei HUANG Xiaoyu Shanghai Marine Diesel engine Research institute Shanghai 201108China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

The free piston Stirling engine external combustion system was simulated to investigate the diesel-air combustion characteristics in order to demonstrate its feasibility by computational fluid dynamics(CFD). The different effects on combustion were distinguished by analyzing the combustion burner, the injection position of diesel oil, the front tube arrangement of Stirling heater head and the back fin. The results show that the tilted front tube arrangement of the heater head with the back fin is the best practicable technology while the distance between the diesel nozzle position and the swirler top is 0. Its total heat flux is 15.6 kW, and the average heat transfer coefficients of the front and back tubes are 127 W/(m2· K) and 192 W/(m2· K), respectively. The heat transfer is mainly through convection, and the proportion of radiative heat transfer is only 16.9%. The best combustion efficiency of the free piston Stirling engine external combustion system is 86%.

关键词： Stirling engine external combustion system numerical simulation diesel-air combustion