基于微型涡流发生器的横向射流被动控制研究

Research on Passive Control of Jet in Supersonic Crossflow

关键词:  微型涡流发生器  横向射流  穿透深度  横向扩散

Key words:  Micro-vortex generator  Jet in supersonic crossflow  Penetration  Lateral diffusion

摘要:

微型涡流发生器放置于喷孔上游，采用纳米粒子平面激光散射(Nano-particle Planer Laser Scattering，NPLS)对微型涡流发生器诱导下的超声速横向射流进行了层析观测，并采用粒子图像测速(Particle Image Velocimetry，PIV)方法计算了观测区域速度分布。对不同流向位置的穿透边界和横向扩散进行提取和统计平均，发现引入涡流发生器后射流穿透边界比未引入时提高了27%左右，而横向扩散最高提高了12.6%。分析涡流发生器尾迹速度场发现，尾迹在射流穿透方向上的诱导速度对射流穿透深度有重要作用，尾迹与射流在近场区域的相互作用是影响射流穿透深度和横向扩散的关键因素。

Abstract:

Micro-vortex generator (MVG) is fixed on the upstream of jet orifice. Nano-particle Planer Laser Scattering (NPLS) technology is employed for flow field planar observation of jet in supersonic crossflow on condition of passive control. Velocity distribution of observing area is obtained by means of Particle Image Velocimetry (PIV) methods. Penetration and lateral diffusion border is extracted from experimental images parallel to yoz plane，and statistical methods are used to deal with the results. It is revealed that penetration boarder is about 27% higher by comparing jet with MVG and without MVG. The most enhancement of lateral diffusion is 12.6%. According to MVG wake velocity distribution analysis，induced velocity along jet direction plays an important role in penetration enhancement. Interaction between wake flow and jet flow in near field mixing region is a critical factor in jet penetration and lateral diffusion.