Prof. Rui Zhao

Beijing Institute of Technology, China

E-mail: zr@bit.edu.cn

Bio

Professor of School of Aerospace Engineering, Beijing Institute of Technology National Young Talent, Director of the Chinese Society of Aerodynamics, Member of the Hypersonic Professional Committee, Advanced Individual for China’s First Mars Exploration Mission His main research interests cover hypersonic multi-physics coupled flow, aerodynamic heating and thermal protection technologies, flow transition and turbulence, fluctuating pressure environments, as well as the development of CFD software.To date, he has published more than 50 papers in top domestic and international aerospace journals such as Journal of Fluid Mechanics and AIAA Journal. He is the author of the monograph Numerical Simulation Methods for Turbulence and Transition. He also serves as a youth editorial board member for Aerodynamic Research and Experiment, Aerospace Technology, and Space Science & Technology

Title

Advances in Hypersonic Transition Models for Complex Ablation Surfaces

Abstract

For flight vehicles equipped with thermal protection systems made of ablative composite materials, prolonged aerodynamic heating leads to surface roughness caused by ablation and erosion, as well as injection of pyrolysis gas. These factors jointly induce premature boundary layer transition. This workr first presents the hypersonic adaptability modifications to the γ-Reθ transition model developed by our research group in recent years, including corrections for local correlation, compressibility and crossflow. Then, the development methodologies of the roughness-induced transition model and injection-induced transition model, together with corresponding numerical validations, are elaborated in detail. The modeling approach for transition triggered by isolated cavities under extreme erosion conditions is also proposed. Finally, potential research directions for transition models considering ablation effects are outlined.