Novel Method for Supersonic Inlet Buzz Measurement in Wind Tunnel

摘要

The feasibility of inlet buzz frequency measurement method using pressure measurement on the wind-tunnel wall is studied experimentally for an axisymmetric mixed-compression inlet. The measured pressure signals on the tunnel wall are compared with the measured pressure on the inlet model surface. The value of buzz frequencies measured by the wind-tunnel wall sensors, for different mass flow ratios, are exactly the same as those measured by the model sensors. Also, the model can measure buzz onset effectively, and the amplitude of measured buzz is lower in comparison with the value measured by the model sensor. The reason was shown to be due to reduction of the inlet shock wave strength near the wall and acoustic attenuation along the tunnel test section. It is better to locate the sensor near the mean shock wall impingement point to measure the buzz more effectively. The proposed methodology can be easily implemented to perform low-cost and rapid inlet stability measurement. It further can be used to rapidly investigate the effect of different flow control methods or geometry changes on the inlet stability.