Characteristics of Large-Scale Structures in Supersonic Planar Mixing Layer with Finite Thickness

Hailong Zhang,Weidong Liu,Jian Chen,Jiping Wu

doi:10.1155/2014/878679

Hailong Zhang, Weidong Liu + Show 2 more

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https://doi.org/10.1155/2014/878679

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Abstract

Nanoparticle-based planar laser scattering (NPLS) experiments and large eddy simulation (LES) were launched to get the fine structure of the supersonic planar mixing layer with finite thickness in the present study. Different from the turbulent development of supersonic planar mixing layer with thin thickness, the development of supersonic planar mixing layer with finite thickness is rapidly. The large-scale structures of mixing layer that possess the characters of quick movement and slow changes transmit to downriver at invariable speed. The transverse results show that the mixing layer is strip of right and dim and possess 3D characteristics. Meanwhile the vortices roll up from two sides to the center. Results indicate that the higher the pressure of the high speed side is, the thicker the mixing layer is. The development of mixing layer is restrained when the pressure of lower speed side is higher. The momentum thickness goes higher with the increase of the clapboard thickness. Through increasing the temperature to change the compression can affect the development of the vortices. The present study can make a contribution to the mixing enhancement and provide initial data for the later investigations.

Highlights

Scramjet is prosperously investigated by all around the world because of its great performance in hypersonic flight condition
The structure is very simple, it contains almost all of the problems that relate to the chemistry and fluent
Supersonic reacting mixing layer is absolutely mixed by fuel and air; so studying on the supersonic turbulent mixing is worthy

Summary

Introduction

Scramjet is prosperously investigated by all around the world because of its great performance in hypersonic flight condition. Supersonic reacting mixing layer is the typical flow structure in Scramjet. The structure is very simple, it contains almost all of the problems that relate to the chemistry and fluent. As this reason, it is very important to understand the inner mechanism. Supersonic reacting mixing layer is absolutely mixed by fuel and air; so studying on the supersonic turbulent mixing is worthy. Two airstreams at different velocity flow through a strut which is one of the typical flow structures [1]. This flow structure can produce vortices because of K-H instability. Among all the models, the thickness of the strut is very small and the instability of the recirculating flow is not intensity

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