Mitigation of shock-induced flow separation over an axisymmetric flared body using ramped vanes

被引:3
作者
Nilavarasan, T. [1 ]
Joshi, G. N. [1 ]
Misra, A. [1 ]
Manisankar, C. [2 ]
Verma, S. B. [2 ]
机构
[1] Def Inst Adv Technol, Dept Aerosp Engn, Pune 411025, India
[2] Natl Aerosp Labs, Expt Aerodynam Div, Bengaluru 560017, India
关键词
Compression corner; Shock-boundary layer interaction; Vortex generator; Flow control; Supersonic flow; BOUNDARY-LAYER INTERACTIONS; INCIPIENT SEPARATION; VORTEX GENERATORS; MICRORAMP CONTROL; PRESSURE; VORTICES; MODEL; FIN;
D O I
10.1007/s12650-023-00933-3
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
This paper brings out the ability of `ramped vane (RV)' vortex generators in attenuating a shock-induced flow separation near an axisymmetric compression corner. Investigations were performed at Mach 2 over a cone-cylinder-flare geometry, with a flow deflection angle of 24 degrees at the cylinder-flare juncture. The boundary layer thickness (delta) at the corner location was estimated to be 5 mm. A circumferential array of RVs was positioned 50 mm (10 delta) upstream of the corner and their trailing edge height (h) was 2.8 mm, which was two-third of the local boundary layer thickness (h = 0.67d(RV)). The RVs produced streamwise counter-rotating vortices that replaced the low-momentum fluid near the model surface with high-momentum fluid from the outermost parts of the boundary layer. As a result, the onset of the interaction/separation was delayed throughout the entire circumference of the model. The interaction's average upstream influence length was reduced by 36%, and the average thickness of the separation region was reduced by about 45%. The surface flow patterns also revealed that the RVs caused large-scale corrugations in the separation and reattachment lines. Furthermore, footprints of small tornado-like vortices could also be seen along the device centrelines, which were likely formed due to interactions between the streamwise vortices and the separation bubble.
引用
收藏
页码:1279 / 1297
页数:19
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