Analysis and Control of an Unstable Mode in a Combustor with Tuneable End Condition. (September 2013)

• Record Type: Journal Article
• Authors: Heckl, Maria; Kosztin, Béla
• Is Part Of: International journal of spray and combustion dynamics. Volume 5:Number 3(2013)
• Page Start: 243
• Page End: 271
• Publication Date: 2013-09
• Subjects: Combustion engineering -- Periodicals; Fluid dynamics -- Periodicals; Combustion -- Periodicals; Spraying -- Periodicals; Combustion; Combustion engineering; Fluid dynamics; Spraying; Periodicals; 541.361
• DOI: 10.1260/1756-8277.5.3.243
• Languages: English
• ISSNs: 1756-8285

Abstract

A major problem in the development of low-pollution combustion systems are thermo-acoustic instabilities, i.e. large-amplitude oscillations generated by a feedback between the unsteady heat release and acoustic waves. In order to develop robust control strategies, it is necessary to have a predictive model that captures the physics of the phenomenon. The aim of this paper is to present such a model for a dump combustor with a generic heat release law, and fitted at the inlet end with a perforated plate backed by a tuneable cavity. Our model leads to a simple governing equation for one acoustic mode in the combustor, and from this equation stability predictions can be made with a minimum of numerical effort. We will use it to examine the effect of various system parameters.