Modification of turbulent boundary layer model based on wall fluctuations measurement

Abstract

A modified turbulent boundary layer (TBL) model based the measurement performed in wind tunnel is proposed to investigate the turbulent boundary layer excitation which usually causes serious vibration of the aircraft structure. The Corcos model is the widely used and classical TBL model to simulate the fluctuating pressure excitation over the aircraft structure. However, the assumption of the non-pressure gradient in boundary layer limits its application in a high-speed flow. To extend the classical model to satisfy the high-speed flow, a modified model based on the measurement in wind tunnel is used to modify the Corcos model. To show the superiority of the modified model developed in this study, different TBL models are used to describe theoretical results and experimental results, respectively. The research results demonstrated that the modified model of TBL excitation could make a better agreement with the test results in wind tunnel than that of the classical Corcos model. Meanwhile, such simpler expression of the modified model shows its great convenience to resolve the engineering problems.