53
Views
25
CrossRef citations to date
0
Altmetric
Original Articles

Active Combustion Control in a Ramjet Using Large-eddy Simulations

Pages 51-79 | Received 26 Feb 1991, Accepted 04 Sep 1991, Published online: 06 Apr 2007
 

Abstract

A large-eddy simulation model has been developed to study combustion instability in a ramjet combustor. A thin-flame model for premixed combustion is employed in the numerical scheme, which explicitly uses the local turbulent flame speed in the governing equation. Combustion instability in the ramjet has been numerically simulated. Two types of instability arc observed: a small-amplitude, high-frequency instability and a large-amplitude, low-frequency instability. Both such instabilities have been experimentally observed, and various computed flow features are in good qualitative agreement with experimental observations. The information obtained from these simulations has been used to develop an active control strategy to suppress the instability. Control of both types of combustion instability was successfully achieved using the acoustic feedback technique, and the control could be used to turn the instability on and off. The control is effective over a range of time delays, and the pressure fluctuation levels in the combustor are significantly reduced when active control is used.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.