某型涡扇发动机进口空气流量测量参数敏感性分析  

Engine Airflow Measurement and Calculation Based on Rake Parameters

作　　者：申世才[1] 王小峰[1] 高扬[1] 马燕荣[1] Shen Shicai;Wang Xiaofeng;Gao Yang;Ma Yanrong(Engine Flight Test Technology Institute,Chinese Flight Test Establishment,Xi’an 710089,China)

机构地区：[1]中国飞行试验研究院发动机所,陕西西安710089

出　　处：《计算机测量与控制》2012年第7期1806-1808,共3页Computer Measurement &Control

摘　　要：基于某型涡扇发动机飞行台试飞,以某型涡扇发动机进口空气流量的测量为研究对象;首先建立了发动机进口空气流量计算模型以及相应的误差计算模型,其次采用辨识方法确定了测量参数的敏感系数,最后针对测量参数的无量纲敏感系数随飞行高度和发动机状态的变化进行了分析;分析结果表明:发动机进口空气对测量截面半径最为敏感,其次为主流区总压、主流区总温和主流区总静压差,对附面层位移厚度敏感性较差,且在发动机设计状态附面层对空气流量的影响为3%。In order to research the measurement of a turbofan engine inlet air flow,first,the model for calculating engine imported air flow and error was given~then the sensitive coefficient of measurement parameters were determined applying identification method;at last,the changes of dimensionless sensitivity coefficient of air flow measurement parameters changing with the pressure altitude and engine work-ing state was analysed.Results show:engine inlet air is most sensitive to the measurement of crossmsection radius,and the total pressure,total temperature and Static pressure difference are less sensitive,the boundary layer displacement thickness is not sensitive to the inlet air;and the effects of the boundary layer of engine design state on air flow is 3%.

关 键 词：发动机 空气流量 附面层位移厚度 测量参数 敏感系数 

分 类 号：TP217[自动化与计算机技术—检测技术与自动化装置]