Experimental research of fluctuating pressure on surface for a certain missile configuration

The characteristics of fluctuating pressure for a certain missile configuration are studied. The Mach number is M∞=0.8,0.84 , 0.86, 0.96, 1.0,1.15, 2.0, 2.5, and the angle of attack is α=-5°、-3°、0°、3°、5°, there were 14 testing holes on the surface along the axes of this missile configuration.Dtailed information for fluctuating pressure coefficient, power spectrum density and spatial correlation has been acquired.The results of the experiment indicate that the fluctuating pressure coefficient reduced with the Mach number increasing.The fluctuating pres-sure has the similar axial cross correlation for any two of the testing points along the axes of this missile configuration at different Mach number.The aixal cross correlation for different testing points along the axes of this missile configuration at zero angle of attack can be neglected.In the range of angle of attack, different angle of attack has little influence over the fluctuating pressure coefficient in the region of small curvature changes.The fluctuating pressure coefficient varies obviously under different angle of attack in the region of remarkable curvature changes.The pow-er spectrum density shows that the character frequency is obvious low at supersonic, and the character frequency increases with the Mach number increasing, and the maximum power spec-trum density located at the location of character frequency.