Empirical Predication of Fluctuating Pressure Environments Around a Rocket Fairing

Abstract

When transonic flow passes the fairing shoulder, it gets separated and interacted with shock waves, resulting in a server fluctuation-pressure level and lower frequency vibration. The flow structures generating the buffet environment are found unsteady and interacted with each other through large-eddy simulation method. The space-correlation corrections are then introduced into the classical empirical functions with predication accuracy largely improved. Also, the entropy function is employed to denote the boundarylayer region, in order to accurately identify the input parameters at the layer edge. Finally, a standard workflow of empirical prediction of fluctuating pressure environment is recommended.