LES investigation into the generation of momentum deficits in the supersonic wake of a micro-ramp

다국어 초록 (Multilingual Abstract)

Implicitly implemented large eddy simulation (LES) with a fifth-order WENO scheme was conducted in this study. Based on Navier- Stokes equations, this LES was carried out to explore the origin of momentum deficit caused by a supersonic micro-ramp at flow conditions of Ma = 2.5 and Reθ = 5760. The numerical results were validated through qualitative and quantitative comparisons with existing experimental data. After describing the aerodynamic properties of the supersonic wake, such as the deficit and the streamwise vortices, the momentum deficit was later detected to originate from the lower portion of the upstream boundary layer, while the high momentum fluid originated from close to the wall at the upper portion. Position alternation trigged by the micro-ramp was finally proposed as a revised mechanism.

참고문헌 (Reference)

1 M. Rybalko, "VGs for a normal SBLI with a downstream diffuser" AIAA

2 Z. Sun, "The three dimensional flow organization in a supersonic boundary layer"

3 S. Lee, "Supersonic boundary-layer interactions with various micro-vortex generator geometries" 113 (113): 683-697, 2009

4 C. Liu, "Study of mechansim of ring-like vortex formation in late flow transition" AIAA

5 J. C. Lin, "Review of research on low-profile vortex generators to control boundary-layer separation" 38 (38): 389-420, 2002

6 Y. Yan, "Numerical, Experimental and Theoretical studies on the mechanism of K-H instability and ring generation behind supersonic MVG" AIAA

7 Yonghua Yan, "Numerical discovery and experimental confirmation of vortex ring generation by microramp vortex generator" Elsevier BV 36 (36): 5700-5708, 2012

8 Q. Li, "Numerical and experimental studies on the separation topology of the MVG controlled flow at M=2.5" AIAA

9 S. Lee, "Normal shock boundary layer control with various vortex generator geometries" AIAA

10 C. S. Kim, "Nonlinear robust control of a hydraulic elevator" 13 (13): 789-803, 2005

11 L. Jiang, "Non-reflecting boundary conditions for DNS in curvilinear coordinates" The State University of New Jersey 1999

12 S. Lee, "Microramps upstream of an oblique-shock/boundary-layer interaction" 48 (48): 104-118, 2010

13 H. Babinsky, "Microramp control of supersonic oblique shock-wave/boundary-layer interactions" 47 (47): 668-675, 2009

14 Lu FK, "Micro vortex generators in highspeed flow" 53 : 30-45, 2012

15 S. Kalpakjian, "Manufacturing processes for engineering materials" Addison-Wesley Publishing Company 1992

16 Y. Yan, "LES study on the mechanism of vortex rings behind supersonic MVG with turbulent inflow" AIAA

17 Q. Li, "LES for supersonic ramp control flow using MVG at M=2.5 and Reθ=1440" AIAA

18 R. S. Chandel, "Effect of welding parameters and groove angle on the soundness of root beads deposited by the SAW process" 479-385, 1986

19 H. Holden, "Effect of microvortex generators on separated normal shock/boundary layer interactions" 44 (44): 170-174, 2007

20 N. A. Adams, "Direct simulation of the turbulent boundary layer along a compression ramp at M = 3 and Re = 1685" 420 : 47-83, 2000

21 Q. Li, "Declining angle effects of the trailing edge of a microramp vortex generator" 47 (47): 2086-2095, 2010

22 J. M. Oorebeek, "Comparison of bleed and micro-vortex generator effects on supersonic boundary-layers" AIAA

23 W. R. Nolan, "Characterization of the micro-vortex generators in supersonic flows" AIAA