Stabilization of a Two-Dimensional Hypersonic Boundary Layer Using a Shallow Cavity

AIAA Journal ◽  
2020 ◽  
pp. 1-9
Author(s):  
Jiaao Hao ◽  
Chih-Yung Wen
Keyword(s):  
Boundary Layer ◽  
Hypersonic Boundary Layer ◽  
Two Dimensional ◽  
Shallow Cavity

On Numerical Prediction of the Stability of Hypersonic Boundary-Layer Flow Over a Row of Microcavities

2003 ◽  
Author(s):  
Vassilios Theofilis ◽  
Michel O. Deville ◽  
Peter W. Duck ◽  
Alexander Fedorov
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Flow ◽  
Flow Instability ◽  
Viscous Sublayer ◽  
Hypersonic Boundary Layer ◽  
Two Dimensional ◽  
Flow Stabilization ◽  
Two Dimensional Flow ◽  
Dimensional Boundary ◽  
Layer Flow

This paper is concerned with the structure of steady two–dimensional flow inside the viscous sublayer in hypersonic boundary–layer flow over a flat surface in which microscopic cavities (‘microcavities’) are embedded. Such a so–called Ultra Absorptive Coating (UAC) has been predicted theoretically [1] and demonstrated experimentally [2] to stabilize passively hypersonic boundary–layer flow. In an effort to further quantify the physical mechanism leading to flow stabilization, this paper focuses on the nature of the basic flows developing in the configuration in question. Direct numerical simulations are performed, addressing firstly steady flow inside a singe microcavity, driven by a constant shear, and secondly a model of a UAC surface in which the two–dimensional boundary layer over a flat plate and a minimum nontrivial of two microcavities embedded in the wall are solved in a coupled manner. The influence of flow– and geometric parameters on the obtained solutions is illustrated. Based on the results obtained, the limitations of currently used theoretical methodologies for the description of flow instability are identified and suggestions for the improved prediction of the instability characteristics of UAC surfaces are discussed.

scholarly journals Управление течением в гиперзвуковом пограничном слое

2020 ◽  
Vol 46 (11) ◽  
pp. 47
Author(s):  
И.И. Липатов ◽  
Ван Кхьем Фам
Keyword(s):  
Boundary Layer ◽  
Flow Control ◽  
Surface Area ◽  
Propagation Velocity ◽  
Temperature Factor ◽  
Hypersonic Boundary Layer ◽  
Two Dimensional

A method of flow control in a two-dimensional hypersonic boundary layer under strong viscous-inviscid interaction is considered. The effect of blocking the process of transferring disturbances upstream due to a decrease in the propagation velocity of disturbances with a decrease in the temperature factor of the surface area is shown.

Zones of influence in a two-dimensional, unsteady, hypersonic boundary layer

1990 ◽  
Vol 431 (1881) ◽  
pp. 37-59
Keyword(s):  
Boundary Layer ◽  
High Frequency ◽  
Viscous Sublayer ◽  
Base Flow ◽  
Nonlinear Flow ◽  
Hypersonic Boundary Layer ◽  
Two Dimensional ◽  
Leading Order ◽  
Asymptotic Structure

An asymptotic structure is developed for a linear, high-frequency, unsteady disturbance superimposed upon a steady, possibly separated, nonlinear flow. The unsteady viscous sublayer is found to split into a two-region structure. The leading-order flowfield is driven primarily by the upper region, which coincides with the region of non-parallel flow in the original steady viscous sublayer. It is found that introducing a viscous-inviscid interaction into the unsteady problem drastically alters the domain of dependence of the unsteady flow throughout the entire viscous sublayer. The determination of the correct domain of dependence is found to involve a subtle interplay between the convective terms, the pressure-displacement interaction and the non-parallel base flow. Preliminary extensions to fully nonlinear unsteady interactive boundary layers are noted.

Sign in / Sign up

Export Citation Format

Share Document