국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators
저자	Zaman, K. B. M. Q.;; Hirt, S. M.;; Bencic, T. J.
Keyword	BOUNDARY LAYER SEPARATION;; DOWNWASH;; FLOW DISTRIBUTION;; LOW SPEED;; TURBULENT BOUNDARY LAYER;; UPSTREAM;; VELOCITY MEASUREMENT;; VORTEX GENERATORS;; VORTICITY;; WIND TUNNEL TESTS
URL	http://hdl.handle.net/2060/20120008642
보고서번호	NASA/TM-2012-217437
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control.