Abstract
The supersonic mixing layer is a typical flow structure in an aircraft’s optical seeker. The free incoming flow and cooling jet form a mixing layer through shearing. In most cases, the flow has become a fully developed turbulent due to complex factors during flight. This paper mainly focuses on the influence of the inlet Reynolds number on the development of the supersonic mixing layer. The rescaling/recycle method is used to generate turbulence at the inlet of the mixing layer. The results show that when the turbulence of the high-speed flow is strong, the transition position of the mixing layer will be advanced and the mixedness will be enhanced. The mixing efficiency is high at the position corresponding to the vortex in the mixing layer. Finally, the Lagrangian coherent structure and particle tracking methods are used to analyze different mixing processes, and the entrainment characteristics of the vortex are studied.
Highlights
The optical window of a high-speed aircraft generally is prepared for optical detection
The free incoming flow above the optical window interacts with the cooling jet, and the formation of a complex supersonic mixing layer will lead to serious aero-optical effects
Monkewitz and Huerre4 proved that the Kelvin–Helmholtz instability played a leading role in the complex flow structure in the mixing layer, causing the fluid to develop into a large-scale vortex structure along the flow field
Summary
The optical window of a high-speed aircraft generally is prepared for optical detection This supersonic mixing layer is a common flow structure of a high-speed aircraft. The research on the mixing layer flow field mainly focuses on observing and describing the evolution of the vortex structure. Monkewitz and Huerre proved that the Kelvin–Helmholtz instability played a leading role in the complex flow structure in the mixing layer, causing the fluid to develop into a large-scale vortex structure along the flow field. Guo et al. used the large eddy simulation (LES) method to study the vortex structure evolution mechanism of the mixing layer based on flow control. By analyzing the changes in vortex structure and particle trajectory under different turbulence intensities, the influence of inlet Reynolds numbers on the supersonic mixing layer is initially revealed
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