基于IIR型滤波进气动态畸变飞行试验研究  

Research in Inlet Time-Varant Distortion in Flight Test Based on IIR Filter

作　　者：张晓飞[1] 姜健[1] 符小刚[1] 

机构地区：[1]中国飞行试验研究院发动机所,西安710089

出　　处：《科学技术与工程》2016年第1期255-261,共7页Science Technology and Engineering

摘　　要：开发集IIR型数字滤波器设计、滤波、紊流度计算为一体进气动态畸变数据处理工具,成功地应用于进气道/发动机相容性飞行试验中评定进气动态畸变。研究表明：1基于幅频特性考虑,采用巴特沃斯法对进气道动态压力滤波,紊流度计算结果比较准确;2滤波器阶数越高,平均紊流度计算结果越准确,建议选择4~6阶;截止频率越高,平均紊流度计算结果越大,截止频率过大或过小均不适宜,应根据实际采样率、发动机扰动频率等综合考虑选取;3飞行速度增大或发动机状态增大,导致进气道出口马赫数和紊流度增大,进气动态畸变程度严重,且呈现出一定的规律性。当飞行速度与发动机状态不匹配时,进气动态畸变会突增。Dynamic pressure distortion data processing tool integrated with IIR filter design,filtering,and turbulence calculating was developing for processing of inlet-engine compatibility flight test to assessment inlet dynamic distortion,The result shows that： 1 considering in the Amplitude-Frequency Characteristic,it＇s suggest to filter inlet dynamic pressure data with Butterworth method,the calculated turbulence will be more accurate; 2 while the filter order is greater,calculating turbulence is more accurate,4 ~ 6 order is suggested to choice; and while cutoff frequency increasing,calculating turbulence is greater,therefore,cutoff frequency choosing should according to sampling frequency and disturbing frequency,neither greater nor lower is suitable; 3 Increasing of flight speed or engine regime will lead increasing of Mach number of inlet exit and turbulence increases,the level of inlet time-variant distortion is exacerbation and shows some regularity. When flight speed and engine regime is unmatched,inlet time-variant distortion increases suddenly.

关 键 词：IIR滤波器 巴特沃斯法 进气动态畸变 紊流度 飞行试验 

分 类 号：V217.39[航空宇航科学与技术—航空宇航推进理论与工程]