국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	The Influence of Realistic Reynolds Numbers on Slat Noise Simulations
저자	Lockard, David P.;; Choudhari, Meelan M.
Keyword	BROADBAND;; COMPUTATIONAL FLUID DYNAMICS;; FFOWCS WILLIAMS-HAWKINGS EQUATION;; NEAR FIELDS;; REYNOLDS NUMBER;; SIMULATION;; TRENDS
URL	http://hdl.handle.net/2060/20120010347
보고서번호	NF1676L-13773
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The slat noise from the 30P/30N high-lift system has been computed using a computational fluid dynamics code in conjunction with a Ffowcs Williams-Hawkings solver. Varying the Reynolds number from 1.71 to 12.0 million based on the stowed chord resulted in slight changes in the radiated noise. Tonal features in the spectra were robust and evident for all Reynolds numbers and even when a spanwise flow was imposed. The general trends observed in near-field fluctuations were also similar for all the different Reynolds numbers. Experiments on simplified, subscale high-lift systems have exhibited noticeable dependencies on the Reynolds number and tripping, although primarily for tonal features rather than the broadband portion of the spectra. Either the 30P/30N model behaves differently, or the computational model is unable to capture these effects. Hence, the results underscore the need for more detailed measurements of the slat cove flow.