Numerical Study on Flow Structures of a Hollow Cone Spray in Crossflow
Numerical Study on Flow Structures of a Hollow Cone Spray in Crossflow
复制标题
空心锥喷雾横流流动结构的数值研究
DOI：
10.1080/01457632.2021.1905315
复制
发表时间：
2021
影响因子：
2.3
通讯作者：
Bofeng Bai
中科院分区：
文献类型：
--
作者：
Haibin Zhang;Hao Zhang;Bofeng Bai
本文对空心锥喷雾横向喷入受限横流的流场结构进行了数值研究。采用尺度自适应模拟方法对非定常湍流流动进行了预测，采用线性不稳定性分析和泰勒破碎理论对喷雾雾化进行了预测。模拟了常温常压下矩形通道（95 mm × 95 mm）内空心锥喷雾（80°和40°两种喷雾角）与横流的相互作用。结果表明，在混合流场中存在6种大尺度涡结构，即对转涡对、马蹄涡、剪切层涡、发夹涡、尾涡和直立涡。分析了这些涡的形成机理。CVP涡和发夹涡分别在展向和流向上对液滴的分散起主导作用。喷雾角对CVP涡量的影响较小，但喷雾角越小，喷雾和CVP的深度越大，两个CVP核之间的距离越小。
In this paper, numerical investigation on the flow field structure of a hollow cone spray injected transversely into a confined crossflow is presented. The unsteady turbulent flow is predicted by adopting the Scale-Adaptive Simulation approach and the atomization of the spray is predicted by using the linear instability analysis and Taylor analogy breakup theory. The interactions between the hollow cone sprays (with two different spray angles of 80° and 40°) and the crossflow inside a rectangular duct (95 mm × 95 mm in cross-section) at ambient temperature and pressure are simulated. The results show that there exist six large-scale vortex structures in the mixing flow field, namely the Counter-rotating Vortex Pair (CVP), the horseshoe vortex, the shear layer vortex, the hairpin vortex, the wake vortex, and the upright vortex. The formation mechanisms of these vortices are analyzed. The CVP and the hairpin vortex dominate the flow field and exert significant influences on droplet dispersion in span-wise and stream-wise directions respectively. The influence of the spray angle on the vorticity of the CVP is small, but a smaller spray angle can lead to larger depths of the spray and the CVP and a smaller distance between both CVP cores.