一种进气道畸变测量动态压力采集设计

The design of an air inlet distortion measure dynamic pressure acquisition

在新机型发动机科目试飞中,发动机进气道畸变特性测试至关重要,其稳定性关系到发动机能否可靠工作。传统方式中将多路进气道壁面总压进行采集,通过后期数据解析提取总压中的动态分量进行分析,此方式延迟较大且提取精度较低。因此设计了一种进气道畸变动态分量实时测量提取方案,在传感器最前端将进气道壁面总压信号中的动态分量进行分离、高增益及滤波处理后采集,与总压信号处于同步状态,保证数据实时相关性,以便评测对比,为发动机进气道畸变量测试提供新的思路。经试验与试飞测试验证,动态压力数据采集精度高达0.3%,满足试飞测试要求,目前已成功应用于某机进气道畸变试飞中。

In new aircraft engine subject test,the engine inlet distortion performance test is important,its stability is related to the engine work reliable.Traditional way,multi-channel acquisition of cylinder inlet total pressure by the late data analysis to analyze the dynamic component of the extraction of total pressure,the way large delay and the extraction precision is low.So we design a dynamic component of inlet distortion real-time measurement extraction scheme,the sensor will the front cylinder inlet total pressure.The dynamic component of signal processing,high gain and filtering after the acquisition,and the total pressure signal in synchronization state,ensure data real-time correlation,in order to measure contrast,providing a new method for the amount of engine inlet distortion test.It has been verified by test and flight test,the dynamic pressure data acquisition precision as high as 0.3%,meet the requirement of flight test,and has been successfully applied in a machine of inlet distortion test.