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Experimental investigation of a novel micro gas turbine with flexible switching function for distributed power system

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Frontiers in Energy 2020年第4期14卷 790-800页

作者： Xiaojing LV Weilun ZENG Xiaoyi DING Yiwu WENG Shilie WENG Research Center for Low Carbon combustion and engine System China-UK Low Carbon CollegeShanghai Jiao Tong UniversityShanghai 200240China Gas Turbine Research institute School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Micro gas turbine(MGT)is widely used in small-scale distributed power systems because of its low emissions and fuel ***,the under-utilization of its exhaust heat and the low electric efficiency are the main bottlenecks that restrict its ***,the flexible switching between the power generated by the MGT and the power grid is also a key factor for keeping the secure operation of a distributed power ***,this paper conducted some experimental investigations of a 30 kW MGT to provide reference solutions for the above *** MGT is located at Shanghai Jiao Tong University(SJTU),which is designed by the Gas Turbine Research institute of SJTU,and is manufactured by a turbo machinery factory in Chongqing,*** demonstration prototype is mainly composed of a single stage centrifugal compressor,a radial turbine,a combustor,a high-speed pennanent magnet generator,and a control *** results show that the MGT can achieve steady operation at a low rotational speed from 10000 r/min to 34000 r/min in the case of using oil lubricated bearings,which can greatly reduce the economic cost compared with the use of air *** the same time,the ignition success rate of combustion chamber(CC)reaches 98%at a low rotational speed,and a wide range of stable combustion area can be obtained,because of the novel design method of combustor by referencing the way applied in an axial flow *** MGT generating set can achieve functions,such as starting up,ignition,stable operation,loaded operation,grid-connection and *** system also can realize flexibly switching from the start motor mode to the generator mode,and from grid-connected mode to off^grid mode,because the innovative multi-state switching control system is *** above research work can make our state master independent intellectual property rights of micro gas turbine,rather than continue to be subject to the technological monopoly of the develop

关键词： gas turbine flexible switching system control system distributed power system emission test

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Experimental Researches of a Hydrogen Fuelled SI engine

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Journal of Energy and Power engineering 2010年第7期4卷 1-8页

作者： N. Negurescu C. Pana M.G. Popa A1. Cernat Department of internal combustion engines University Politehnica of Bucharest Bucharest 060042 Romania

The paper presents the results of the experimental research which was carried out on the spark ignition engine, experimental model, fuelled with hydrogen by direct injection method, using qualitative load adjustment method for engine running control. Also, the hydrogen injection solution at the beginning of the compression stroke, after the inlet valve closing, assures the cylinder cooling by inlet air avoiding in that way uncontrolled ignition phenomena and inlet back fire. Using this fueling method avoided the abnormally hydrogen combustion phenomena＇s for stoichiometric dosage operating conditions, achieving -30 % engine power increase. Hydrogen engine runs with very lean mixtures, due to engine load qualitative adjustment, a dosage value that leads to a reduction of the engine power with -25% from maximum power value. This provides a higher engine efficiency at low loads, the best results was obtained for λ=2- 4 air-fuel ratio values. The influence of the mixture quality on burning process, on polluting and energetically engine performances at the fuelling with hydrogen using direct injection method are presented. Because of the higher combustion temperature, the NOx emission level is higher for λ=1 - 2 comparative to gasoline fuelled engine, but decreases a lot for leaner mixture values, λ〉2.5.

关键词： Hydrogen pollutants lean mixture combustion.

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Characteristics and mechanisms of turboshaft engine axial compressor casing containment

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Chinese Journal of Aeronautics 2021年第1期34卷 171-180页

作者： Zekan HE Xiaojun GUO Haijun XUAN Xiaoming SHAN Xiaojing FAN Chuanyong CHEN Weirong HONG College of Energy engineering Zhejiang UniversityHangzhou 310027China Collaborative Innovation Center for Advanced Aero-engine Beijing 100083China AECC Hunan Aviation Power plant Research institute Zhuzhou 410002China

To investigate the containment characteristics and mechanisms of axial compressor blade and casing in turboshaft engine,experimental and simulation research is conducted on Titanium alloy axial compressor blades and stainless steel simulator casings in this *** for four thicknesses(from 0.8 mm to 1.4 mm)of casings are presented on high-speed spin ***,ricochet with and without failure of the casings are obtained in test *** obvious bulges or dishing region are observed,petaling failure occurs in the first bulge or the third deformation *** and elongated dimples are observed at the fracture *** Element(FE)models with calibrated Johnson-Cook material behavior law are built and analyzed by using explicit dynamic software for a better understanding on the containment *** agreement is obtained between the experimental observations and numerical *** evolution of the impact force,energy absorption,temperature increase and the cracks’propagation are *** force peaks occur in the impact *** analysis reveals that penetration condition of ricochet with failure leads to most internal energy of the casing.

关键词： Axial compressor Blade and casing containment Damage characteristic Deformation and failure mechanism

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An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

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Chinese Journal of Mechanical engineering 2020年第2期33卷 43-55页

作者： Jimin Xu Changhuan Li Xusheng Miao Cuiping Zhang Xiaoyang Yuan institute of Tribology School of Mechanical EngineeringHefei University of TechnologyHefei 230009China Aerospace Propulsion institute China Aerospace Science and Technology CorporationXi’an 710100China Science Technology on combustion Internal Flow and Thermal‑structure LaboratoryNorthwestern Polytechnical UniversityXi’an 710012China Superconducting Materials Research Center Laboratory Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China Key Laboratory of Education Ministry for Modern Design and Rotor‑Bearing System Xi’an Jiaotong UniversityXi’an 710049China

There is a consensus in the aerospace field that the development of reusable liquid rockets can effectively reduce the launch *** pursuit of a long service life and reutilization highly depends on the bearing ***,the rolling element bearings(REBs)used in the existing rocket turbopumps present obvious and increasing limitations due to their mechanical contacting *** REBs,high rotational speed and long service life are two performance indexes that mutually restrict each *** go beyond the DN value(the product of the bearing bore and rotational speed)limit of REBs,the major space powers have conducted substantial explorations on the use of new types of bearings to replace the *** review discusses,first,the crucial role of bearings in rocket turbopumps and the related structural improvements of ***,with the prospect of application to the next generation of reusable liquid rocket turbopumps,the bearing candidates investigated by major space powers are summarized *** promising alternatives to REBs include fluid-film,foil,and magnetic bearings,together with the novel superconducting compound bearings recently proposed by our *** more than ten years of relevant research on fluid-film and magnetic bearings are also *** review is meaningful for the development of long-life and highly reliable bearings to be used in future reusable rocket turbopumps.

关键词： Aerospace Reusable liquid rocket turbopumps Rolling element bearings Bearing candidates Review

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A comparative single-pulse shock tube experiment and kinetic modeling study on pyrolysis of cyclohexane,methylcyclohexane and ethylcyclohexane

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Defence Technology（防务技术） 2023年第2期20卷 137-148页

作者： Jin-hu Liang Shu-tong Cao Fei Li Xiao-liang Li Rui-ning He Xin Bai Quan-De Wang Yang Li School of Environmental and Safety engineering North University of ChinaTaiyuan030051People's Republic of China Science and Technology on combustion Internal Flow and Thermostructure LaboratorySchool of AstronauticsNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Low Carbon Energy institute and School of Chemical engineering China University of Mining and TechnologyXuzhou 221008People's Republic of China

The pyrolysis of cyclohexane,methylcyclohexane,and ethylcyclohexane have been studied behind reflected shock waves at pressures of 5 and10 bar and at temperatures of 930-1550 K for 0.05%fuel diluted by Argon.A single-pulse shock tube(SPST)is used to perform the pyrolysis experiments at reaction times varying from 1.65 to 1.74 *** products are obtained and quantified using gas chromatography analysis.A flame ionization detector and a thermal conductivity detector are used for species identification and *** modeling has been performed using several detailed and lumped chemical kinetic *** in modeling results among the kinetic models are *** path analysis and sensitivity analysis are performed to determine the important reactions controlling fuel pyrolysis and their influence on the predicted concentrations of reactant and product species *** present work provides new fundamental knowledge in understating pyrolysis characteristics of cyclohexane compounds and additional data set for detailed kinetic mechanism development.

关键词： Cyclohexane Alkylated cyclohexane Single-pulse shock tube Pyrolysis Kinetic modeling

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On Temperature and Strain Rate Dependent Strain Localization Behavior in Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

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Journal of Materials Science & Technology 2013年第3期29卷 273-278页

作者： B.Zhang L.M.Lei X.L.Jiang Z.M.Song X.Huang G.P.Zhang Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern University Titanium Alloys Laboratory Beijing Institute of Aeronautical Materials AVIC commercial Aircraft engine Co. Ltd. Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Deformation behaviors of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloys with α/β lamellar structure were investigated systematically at different temperatures from room temperature to 950 ~C and different strain rates. Results reveal that when the deformation temperature is higher than a critical temperature of 600℃, an evident transition of deformation behavior from localized shear banding to α/β lamella kinking, flow softening and temperature/strain rate-dependent peak flow stress occurred in the alloy. The critical conditions for the occurrence of internal cracking and strain localization behavior associated with temperature and strain rate were determined.

关键词： Titanium alloy Hot working Temperature Strain rate Shear band

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Explosion characteristics of aluminum-based activated fuels containing fluorine

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Defence Technology（防务技术） 2023年第2期20卷 34-43页

作者： Jin-tao Xu Lei Huang Hai-peng Jiang Tian-jiao Zhang Feng-qi Zhao Jian-kan Zhang Wei Gao State Key Laboratory of Fine Chemicals Department of Chemical Machinery and Safety EngineeringDalian University of TechnologyDalian116024China Beijing institute of Aerospace Testing Technology Beijing100074China Science and Technology on combustion and Explosion Laboratory Xi'an Modern Chemistry Research InstituteXi'an710065China

Measuring the dust explosion characteristics of aluminum-based activated fuels was a prerequisite for developing effective prevention and control *** this paper,ignition sensitivity,flame propagation behaviors and explosion severity of aluminum/polytetrafluoroethylene(Al/PTFE)compositions including 2 PT(2.80 wt.%F),4 PT(7.18 wt.%F)and 8 PT(11.90 wt.%F)were *** the content of F increased from 2.80 wt.%to 11.90 wt.%,the minimum explosive concentration MEC decreased from380 g/m^(3)to 140 g/m^(3),due to the dual effects of increased internal active aluminum and enhanced *** average flame propagation velocities increased as the percentage of F *** maximum explosion pressure Pmof 500 g/m3aluminum-based activated fuels increased from 247 k Pa to299 *** electron microscopy demonstrated that with the increase of PTFE content,the reaction was more *** this basis,the explosion mechanism of aluminum-based activated fuels was revealed.

关键词： Aluminum-based activated fuels Ignition sensitivity Flame propagation Explosion severity Explosion mechanism

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Establishment of a CouplingModel for the Prediction of Heat Dissipation of the internal combustion engine Based on Finite Element

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Energy engineering 2022年第3期119卷 1103-1116页

作者： Hongyu Mu Yinyan Wang Hong Teng Xingtian Zhao Xiaolong Zhang Yan Jin Shiyang Hao Jingfeng Zhao College of Power and Energy engineering Harbin Engineering UniversityHarbin150001China engine Department R&D CenterHarbin Dongan Auto Engine Co.Ltd.Harbin150066China

The aerodynamics and heat transfer performance in the rear-mounted automobile cabin have an important influence on the engine’s safety and the operational stability of the *** article uses STARCCM and GT-COOL software to establish the 3D wind tunnel model and engine cooling system model of the internal combustion *** the same time,we established a 3D artificial coupling model through parameter *** research results show that the heat transfer coefficient decreases with the increase of the comprehensive drag coefficient of the *** shows that the cabin flow field has an important influence on the heat transfer *** temperature rise of the engine room increases with the increase of the engine *** is proved that vehicle speed affects the amount of heat dissipation of the engine room internal combustion engine under certain load *** article provides a more effective and fast calculation method for the research on the heat dissipation of the internal combustion engine and the optimization of the cooling system equipment.

关键词： internal combustion engine coupled model prediction heat dissipation heat dissipation of the whole machine

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A Lagrangian-based flame index for the transported probability density function method

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Theoretical & Applied Mechanics Letters 2022年第1期12卷 30-34页

作者： Zhen Lu Hua Zhou Zhuyin Ren Yue Yang Hong G.Im State Key Laboratory for Turbulent and Complex Systems College of EngineeringPeking UniversityBeijing 100871China BIC-ESAT Peking UniversityBeijing 100871China Clean combustion Research Center King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia institute of Aero engine Tsinghua UniversityBeijing 100084China HEDPS-CAPT Peking UniversityBeijing 100871China

We propose a new flame index for the transported probability density function(PDF) method. The flame index uses mixing flux projections of Lagrangian particles on mixture fraction and progress variable directions as the metrics to identify the combustion mode, with the Burke-Schumann solution as a reference. A priori validation of the flame index is conducted with a series of constructed turbulent partially premixed reactors. It indicates that the proposed flame index is able to identify the combustion mode based on the subgrid mixing information. The flame index is then applied the large eddy simulation/PDF datasets of turbulent partially premixed jet flames. Results show that the flame index separate different combustion modes and extinction correctly. The proposed flame index provides a promising tool to analyze and model the partially premixed flames adaptively.

关键词： Flame index Transported probability density function Partially premixed combustion

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Summarization on variable liquid thrust rocket engines

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Science China(Technological Sciences) 2009年第10期52卷 2918-2923页

作者： YUE ChunGuo LI JinXian HOU Xiao FENG XiPing YANG ShuJun The Second Artillery engineering Collge Xi’an 710025China National Laboratory of combustion Flow and Thermo-structureNorthwestern Polytechnical UniversityXi’an 710072China 203 institute of China North Industries Group Corporation Xi’an 710065China

The technology actuality and development trend of variable thrust rocket engines at home and abroad are summarized. Key technologies of developing variable thrust rocket engines are analyzed. Development advices on de... 详细信息

关键词： variable thrust rocket engine pintle injector actuality advice

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