국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Effects of Nose Bluntness on Hypersonic Boundary-Layer Receptivity and Stability Over Cones
저자	Kara, Kursat;; Balakumar, Ponnampalam;; Kandil, Osama A.
Keyword	BOUNDARY LAYER STABILITY;; BOUNDARY LAYER TRANSITION;; ENTROPY;; FLOW DISTRIBUTION;; FREE FLOW;; FREQUENCY STABILITY;; HYPERSONIC BOUNDARY LAYER;; INVISCID FLOW;; MACH NUMBER;; SHOCK WAVE INTERACTION;; SOUND WAVES;; UPSTREAM
URL	http://hdl.handle.net/2060/20110023840
보고서번호	AIAA Paper 2007-4492
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The receptivity to freestream acoustic disturbances and the stability properties of hypersonic boundary layers are numerically investigated for boundary-layer flows over a 5 straight cone at a freestream Mach number of 6.0. To compute the shock and the interaction of the shock with the instability waves, the Navier-Stokes equations in axisymmetric coordinates were solved. In the governing equations, inviscid and viscous flux vectors are discretized using a fifth-order accurate weighted-essentially-non-oscillatory scheme. A third-order accurate total-variation-diminishing Runge-Kutta scheme is employed for time integration. After the mean flow field is computed, disturbances are introduced at the upstream end of the computational domain. The appearance of instability waves near the nose region and the receptivity of the boundary layer with respect to slow mode acoustic waves are investigated. Computations confirm the stabilizing effect of nose bluntness and the role of the entropy layer in the delay of boundary-layer transition. The current solutions, compared with experimental observations and other computational results, exhibit good agreement.