국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Inlet Flow Control and Prediction Technologies for Embedded Propulsion Systems
저자	McMillan, Michelle L.;; Gissen, Abe;; Vukasinovic, Bojan;; Lakebrink, Matthew T.;; Glezer, Ari;; Mani, Mori;; Mace, James
Keyword	ACTIVE CONTROL;; BOUNDARY LAYERS;; CONTROL EQUIPMENT;; FAIL-SAFE SYSTEMS;; FLOW DISTRIBUTION;; FLUID DYNAMICS;; INLET FLOW;; LOW NOISE;; PREDICTION ANALYSIS TECHNIQUES;; PROPULSION SYSTEM PERFORMANCE;; TURBULENCE MODELS
URL	http://hdl.handle.net/2060/20100037209
보고서번호	NASA/CR-2010-216779
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Fail-safe inlet flow control may enable high-speed cruise efficiency, low noise signature, and reduced fuel-burn goals for hybrid wing-body aircraft. The objectives of this program are to develop flow control and prediction methodologies for boundary-layer ingesting (BLI) inlets used in these aircraft. This report covers the second of a three year program. The approach integrates experiments and numerical simulations. Both passive and active flow-control devices were tested in a small-scale wind tunnel. Hybrid actuation approaches, combining a passive microvane and active synthetic jet, were tested in various geometric arrangements. Detailed flow measurements were taken to provide insight into the flow physics. Results of the numerical simulations were correlated against experimental data. The sensitivity of results to grid resolution and turbulence models was examined. Aerodynamic benefits from microvanes and microramps were assessed when installed in an offset BLI inlet. Benefits were quantified in terms of recovery and distortion changes. Microvanes were more effective than microramps at improving recovery and distortion.