基于五孔探针的大S弯进气道总压畸变测量与评估

进气道总压畸变的测量与评定是进气道/发动机一体化的重要内容。大S弯进气道具备出色的隐身性能，但其出口流场非常复杂，传统总压测量方法造成的误差显著增大，进而引起总压畸变评估误差，阻碍进/发一体化设计。为了提高大S弯进气道的总压畸变测量与评估的准确性，本文提出了一套基于五孔探针的测量方法。分析测量结果表明:分区拟合方法更能适应大S弯进气道强旋流场的总压数据处理；随着马赫数从0.2增加到0.6，周向总压畸变指数从0.005左右递增到0.09左右，径向总压畸变指数最大不超过0.055，马赫数越大，总压畸变越剧烈，周向总压畸变占据主导；出口截面主要总压畸变区的总压恢复系数最低不到0.85；相比数值计算、总压耙测量，五孔探针测得结果更加全面、合理。

Assessment and measurement of total pressure distortion based on five-hole-probe for S-shaped inlet

The assessment and measurement of total pressure distortion of the inlet is significant in the assessment of the integration of the inlet and engine. S-shaped inlet possesses great stealth performance, but the complex fluid field in the outlet contributes to error in the measurement and assessment, which impedes the integration of the inlet and engine. The experimental results show that the sector fitting is suitable for data processing of total pressure in the S-shaped inlet. The circumferential total pressure distortion index increases from 0.005 to 0.09 while the maximum radial index not exceeding 0.055 with the increase of Mach number from 0.2 to 0.6. The higher Mach number is, the severer total pressure distortion is. Total pressure recovery index of the main area of total pressure distortion in outlet is below 0.85. In total, compared with numerical computation and the rake measurement, the results of five-hole-probe measurement are more comprehensive and rational.