Accession Number:

ADA413925

Title:

Enhancement of Transonic Airfoil Performance Using Pulsed Jets for Separation Control

Descriptive Note:

Conference paper

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE

Personal Author(s):

Report Date:

2001-01-01

Pagination or Media Count:

14.0

Abstract:

Selected active and passive flow control devices have been investigated for their possible improvements to transonic airfoil performance. These investigations are part of co-operative effort between the U.S.s Air Force Research Laboratory AFRL and the UKs Defense Evaluation and Research Agency DERA to explore flow control concepts. In particular, this manuscript reports on an experimental demonstration of pulsed vortex generator jets PVGJs conducted in DERAs High Speed Tunnel in Bedford. The primary goal of this test was to demonstrate the effectiveness of using PVGJs to suppress shock-induced separation of a transonic airfoil. It had yet to be demonstrated that this control technique would result in a net performance improvement. The influence of pulsing frequency on performance was evaluated over a range of lift conditions. The experiments were conducted at Mach numbers from 0.67 to 0.71, yielding chord Reynolds numbers of about 19 million.

Subject Categories:

  • Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE