检索结果-南通市图书馆

Experimental study on combustion characteristics of supersonic combustor based on alternating-wedge strut

Chinese Journal of Aeronautics 2024年第5期37卷 214-227页

作者： Jie LI Wenyan SONG Yuhang WANG School of Power Energy Northwestern Polytechnical UniversityXi’an 710129China

Acetone Planar Lase-Induced Fluorescence(PLIF)and OH-PLIF were employed to capture the fuel distribution and OH distribution downstream for the supersonic combustor based on the alternating-wedge strut.The combustion establishment process and combustion mode in the combustor under different fuel injection methods and different equivalence ratios were analyzed.Combined with the kerosene-PLIF and OH-PLIF results in the cavity combustor,a comparative analysis was conducted to understand the combustion characteristics and combustion modes between the alternating-wedge strut-based combustor and the cavity-based combustor.The results show that the combustor is in weak combustion mode in the case of low equivalence ratio,and the combustor is in intensive combustion mode in the case of high equivalence ratio.The lower limit of the equivalence ratio of the combustor to maintain the intensive combustion mode varies based on different fuel injection methods.The OH distribution under reacting condition has a strong correlation with the fuel distribution under non-reacting condition.The OH fluorescence signal near the injector is weaker when the fuel distribution is more concentrated.The injector position located at the base of the strut rear has better mixing performance,enabling the combustor to be in intensive combustion mode at a lower equivalence ratio.The combustion reaction in the alternating-wedge strut-based combustor is not necessarily dominated by mass transfer due to the mixing enhancement and premixed zone downstream of strut,while the combustion reaction process in the cavity-based combustor is mainly influenced by mass transfer.

关键词： Supersonic combustor Alternating-wedge strut Cavity PLIF fuel injection fuel distribution Combustion characteristics Combustion mode

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Trajectory Analysis of fuel injection into Supersonic Cross Flow Based on Schlieren Method

引用

Chinese Journal of Aeronautics 2012年第1期25卷 42-50页

作者： YANG Hui LI Feng SUN Baigang School of Jet Propulsion Beihang University Beijing 100191 China

Trajectory analysis of fuel injection into supersonic cross flow is studied in this paper. A directly-connected wind tunnel is constructed to provide stable supersonic freestream. Based on the test rig, the schlieren system is established to reveal the fuel injection process visually. Subsequently, the method of quantitative schlieren is adopted to obtain data of both fuel/air interface and bow shock with the aid of Photoshop and Origin. Finally, the mechanism based on two influential factors of fuel injection angle and fuel injection driven pressure, is researched by vector analysis. A dimensionless model is deduced and analyzed. The curve fitting result is achieved. The relationship between the data and the two influential factors is established. The results provide not only the quantitative characteristics of the fuel injection in supersonic cross flow but also the valuable reference for the future computational simulation.

关键词： fuel injection schlieren supersonic flow injection driven pressure injection angle characteristic velocity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design and optimization of a novel electrically controlled high pressure fuel injection system for heavy fuel aircraft piston engine

引用

Chinese Journal of Aeronautics 2018年第9期31卷 1920-1928页

作者： Ke ZHANG Xudong HUANG Zhifeng XIE Ming ZHOU School of Aerospace Engineering Tsinghua University

The heavy fuel compression ignition engines are widely equipped as aircraft piston engines. The fuel injection system is one of the key technologies that determines the performance of engine. One of the main challenges is to precisely control the injected fuel quantity and flow rate in the presence of pressure fluctuation. This challenge is even more serious for heavy fuel. An original design for electrically controlled high pressure fuel injection system called Multi-Pumppressure-reservoirs fuel injection System(MPS) was demonstrated to reduce the pressure fluctuation and help keep injection stable. MPS was compared with an ordinary high pressure Common Rail fuel injection System(CRS). This work established one-dimensional AMESim and mathematical models for both CRS and MPS to study the effect of different structures and geometric parameters on the pressure fluctuations. The calculations show that the average fuel pressure fluctuation of MPS can be reduced by 57% for the crankshaft speed of 1900 r/min, and the pressure fluctuation before injection reduced by 100%. It is concluded that the pressure performance of MPS is less sensitive to pressure reservoir volume than that of CRS, and there is an opportunity for further volume reduction.

关键词： Aircraft engines AMESim Common rail fuel injection Mathematical models Pressure effects Structural design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental Study on Effects of fuel injection on Scramjet Combustor Performance

引用

Chinese Journal of Aeronautics 2007年第6期20卷 488-494页

作者： Wu Xianyu Li Xiaoshan Ding Meng Liu Weidong Wang Zhenguo College of Aerospace and Material Engineering National University of Defense Technology ChangSha 410073 China

In order to investigate the effects of fuel injection distribution on the scrarnjet combustor performance, there are conducted three sets of test on a hydrocarbon fueled direct-connect scramjet test facility. The results of Test A, whose fuel injection is carried out with injectors located on the top-wall and the bottom-wall, show that the fuel injection with an appropriate close-front and centralized distribution would be of much help to optimize combustor performances. The results of Test B, whose fuel injection is performed at the optimal injection locations found in Test A, with a given equivalence ratio and different injection proportions for each injector, show that this injection mode is of little benefit to improve combustor performances. The results of Test C with a circumferential fuel injection distribution displaies the possibility of ameliorating combustor performance. By analyzing the effects of injection location parameters on combustor performances on the base of the data of Test C, it is clear that the injector location has strong coupled influences on combustor performances. In addition, an irmer-force synthesis specific impulse is used to reduce the errors caused by the disturbance of fuel supply and working state of air heater while assessing combustor performances.

关键词： scramjet combustor fuel injection direct-cormect test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Review of Engine fuel injection Studies Using Synchrotron Radiation X-ray Imaging

引用

Automotive Innovation 2019年第2期2卷 79-92页

作者： Zhijun Wu Wenbo Zhao Zhilong Li Jun Deng Zongjie Hu Liguang Li School of Automotive Studies Tongji UniversityShanghai 201804China

fuel spray characteristics directly determine the formation pattern and quality of the fuel/air mixture in an engine,and thus affect the combustion process.For this reason,the improvement and optimization of fuel injection systems is crucial to the development of engine technologies.The fuel jet breakup and atomization process is a complex liquid-gas two-phase turbulent flow system that has not yet been fully elucidated.Owing to the limitations of standard optical measurement techniques,the spray breakup mechanism and its interaction with the nozzle internal flow are still unclear.However,in recent years synchrotron radiation(SR)X-ray imaging technologies have been widely applied in engine fuel injection studies because of the higher energy and brilliance of third-generation SR light sources.This review provides a brief introduction to the development of SR technology and compares the critical parameters of the primary third-generation SR light sources available worldwide.The basic principles and applications of various X-ray imaging technologies with regard to nozzle internal structure measurements,visualization of in-nozzle flow characteristics and quantitative analyses of near-field spray transient dynamics are examined in detail.

关键词： X-ray imaging technology fuel injection Nozzle internal structure In-nozzle flow visualization Near-field spray dynamics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental Research of 500bar Ultra-high-pressure fuel injection System for Gasoline Direct injection Engine

Experimental Research of 500bar Ultra-high-pressure Fuel Inj...

引用

2021中国汽车工程学会年会暨展览会

作者： Zhang Yajun Cheng Chuanhui Xu Zheng Wang Shaoming Wang Tong Fang Liang Lou Diming SAIC Motor Technical Centre Shanghai Key Laboratory of Automobile Power-train Tongji University

The characteristics of 500 bar ultra-high-pressure fuel injection system was studied on a 1.5 L gasoline direct injection（GDI） engine,the comparison of gaseous and particulate emissions and fuel consumption under cooled and hot engine conditions was analyzed between 350 bar and 500 bar of injection pressure,including part load,full load,and mini map points that have been extracted from world light-duty test cycle（WLTC）.The results show that,the benefit of particulate decease from 500 bar will be achieved at different conditions,which could reach roughly up to 50% at part load while 30% for average at full load.Moreover,both of the nucleate and accumulative particulates show obvious improvement at all the sizes range,which will provide effective solution for meeting the challenge of particulate limit with smaller size from more stringent legislations.On the other hand,the ultra-high-pressure fuel injection almost would not produce negative effect on fuel consumption and gas emission under most conditions.

关键词： 500bar ultra-high-pressure fuel injection gasoline engine direct injection

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Conditional Generative Adversarial Networks for modelling fuel sprays

能源与人工智能(英文)

引用

能源与人工智能(英文) 2023年第2期12卷 62-75页

作者： Cihan Ates Farhad Karwan Max Okraschevski Rainer Koch Hans-Jörg Bauer Karlsruhe Institute of Technology(KIT) Institute of Thermal TurbomachineryGermany Karlsruhe Institute of Technology(KIT) Machine Intelligence in Energy SystemsGermany

In this study, the probabilistic, data driven nature of the generative adversarial neural networks (GANs)was utilized to conduct virtual spray simulations for conditions relevant to aero engine combustors. Themodel consists of two sub-modules: (i) an autoencoder converting the variable length droplet trajectories intofixed length, lower dimensional representations and (ii) a Wasserstein GAN that learns to mimic the latentrepresentations of the evaporating droplets along their lifetime. The GAN module was also conditioned withthe injection location and the diameters of the droplets to increase the generalizability of the whole framework.The training data was provided from highly resolved 3D, transient Eulerian–Lagrangian, large eddy simulationsconducted with OpenFOAM. Neural network models were created and trained within the open source machinelearning framework of PyTorch. Predictive capabilities of the proposed method was discussed with respect tospray statistics and evaporation dynamics. Results show that conditioned GAN models offer a great potentialas low order model approximations with high computational efficiency. Nonetheless, the capabilities of theautoencoder module to preserve local dependencies should be improved to realize this potential. For the currentcase study, the custom model architecture was capable of conducting the simulation in the order of secondsafter a day of training, which had taken one week on HPC with the conventional CFD approach for the samenumber of droplets (200,000 trajectories).

关键词： Generative Adversarial Networks Generative learning fuel injection Aero engines Multivariate time series

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Extracting the core indicators of pulverized coal for blast furnace injection based on principal component analysis

引用

International Journal of Minerals,Metallurgy and Materials 2013年第3期20卷 246-252页

作者： Hong-wei Guo Bu-xin Su Jian-liang Zhang Meng-yi Zhu Jian Chang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

An updated approach to refining the core indicators of pulverized coal used for blast furnace injection based on principal component analysis is proposed in view of the disadvantages of the existing performance indicator system of pulverized coal used in blast furnaces. This presented method takes into account all the performance indicators of pulverized coal injection, including calorific value, igniting point, combustibility, reactivity, flowability, grindability, etc. Four core indicators of pulverized coal injection are selected and studied by using principal component analysis, namely, comprehensive combustibility, comprehensive reactivity, comprehensive flowability, and comprehensive grindability. The newly established core index system is not only beneficial to narrowing down current evaluation indices but also effective to avoid previous overlapping problems among indicators by mutually independent index design. Furthermore, a comprehensive property indicator is introduced on the basis of the four core indicators, and the injection properties of pulverized coal can be overall evaluated.

关键词： blast furnaces pulverized coal fuel injection principal component analysis indicators

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Flight Vehicle Performance and Aerodynamic Control

引用

丛书名： AIAA Education Series

2001年

作者： Frederick O. Smetana

ISBN: (数字)9781600861857

ISBN: (纸本)9781563474637

Flight Vehicle Performance and Aerodynamic Control is designed to serve as a text for either an 11-week or a 16-week course at the sophomore level. It explains typical methods used to estimate aircraft performance, the theoretical basis of these methods, and how various parameters derived from the aircraft geometry can be used to estimate the requirements of control surfaces and the aerodynamic forces required to actuate these surfaces. This book includes time-tested computer programs that perform the analyses in a manner that reduces student error and improves result accuracy. Because the source code is given, users with a FORTRAN compiler can modify the program to suit particular needs. The major advantage of the software is that more realistic problems may be treated and the effects of parametric programs are more accurate than calculators. The programs are available as executables for Windows machines as well as in ASCII source code versions that can be readily compiled and then executed on Unix, Linux, and Macintosh machines, and on mainframes.

关键词： Aerodynamic Performance Aerodynamics Aeronautical Engineering Aeronautics Aerospace Engineering Aerospace Sciences Aircraft Carriers Aircraft Components and Structure Aircraft Conceptual Design Aircraft Design Aircraft Dynamic Modes Aircraft Engines Aircraft Instruments Aircraft Operations Aircraft Operations and Technology Aircraft Performance Aircraft Stability and Control Aircraft Stabilizer Aircraft Wing Components Aircraft Wing Design Aircrafts Airfoil Airfoil Nomenclature Airspeed Astrodynamics Astronautics Atmospheric Science Aviation Aviation Authorities and Organizations Aviation Safety Avionics Civil Aviation Combat Aircraft Combustion Chambers Compressors Energy Energy Conversion Energy Economics Energy Forms Energy Forms, Production and Conversion Energy Production Fixed-Wing Aircraft Flight Control Surfaces Flight Dynamics Flight Mechanics Flight Test Flight Training Fluid Dynamics Fluid Flow Properties Fluid Mechanics Fossil fuels fuel injection fuels Gas Turbine Guidance, Navigation, and Control Systems Heat Engines Helicopters Hydraulics Hydrodynamics Ignition Systems Jet Aircraft Liquid fuels Longitudinal Static Stability Military Airbases Military Aircraft Military Aviation Non-Renewable Energy Petroleum Power Station Propulsion and Power Reciprocating Engine Rocket Engine Rocketry Rotorcrafts Sensors Short Takeoff and Landing Takeoff and Landing Transducers Turbines Turbomachinery Unmanned Aerial Vehicle Wind Engineering Wind Tunnels Wind Turbine Wing Configurations Wing Planforms

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Lyapunov-Design of Adaptive Air-fuel Ratio Control for Gasoline Engines based on Mean-Value Model

Lyapunov-Design of Adaptive Air-Fuel Ratio Control for Gasol...

引用

第三十届中国控制会议

作者： JIAO Xiaohong~1,SHEN Tielong~2 1.Institute of Electrical Engineering,Yanshan University,Qinhuangdao 066004,P.R.China 2.Department of Mechanical Engineering,Sophia University,Tokyo 102-8554,Japan

＜正＞In order to maintain the in-cylinder air-fuel ratio（AFR） at a prescribed set point,the stoichiometric value,this paper presents an adaptive regulator of AFR control based on Lyapunov-design for the spark ignition engines.In the research,the adaptive regulator is based on the mean value model of the engine which accounts for the impingement of the injected fuel on the manifold walls and the evaporation process.Adaptive update laws are derived for estimating the uncertain parameters related to inaccuracies in air flow into the cylinders and engine torque production and the uncertain fueling parameters of the fuel injection process.The closed-loop fuel controller is realized by utilizing the information of measurable engine speed,manifold pressure and temperature,air mass flow rate through throttle and the exhaust gas oxygen（EGO） sensor at exhaust location, without knowledge of the fuel flow mass.The theoretical proof and analysis show that the closed-loop system possesses the stability and satisfactory AFR value during both steady state and transient operation.Moreover,simulation on an engine test bench demonstrates the capability of the adaptive controller to recover the performance and robustness properties of the control system in the case of uncertainty,disturbance and the intake-to-power delay and the measurement delay of the oxygen sensor.

关键词： Air-to-fuel ratio control Adaptive regulator fuel injection Spark ignition engine Mean-value model

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：