Year: 1996
Type: article
Abstract: Chiefly for improved efficiency, the trend to increasing use of gas turbine engines in stationary \npowerplants has been firmly established. The requirement for minimum NOx production has motivated \noperation as close as practically possible near the lean flammability limit, to reduce flame temperatures and \nconsequently reduce formation of nitrogen oxides via the Zeldovich thermal mechanism. However, \nexperience has shown that under these conditions, stability of the chamber is compromised, often leading \nto the presence of sustained oscillations in the combustor. That possibility raises the problem of the \ninfluence of oscillatory motions on the production of nitrogen oxides. Numerically calculating these \ninfluences for a complex geometry gas turbine combustor is too computationally expensive at this ?me. \nNonlinear analytical methods making use of these influences are a promising direction for simplei ways to \ndesign and develop operational gas turbine combustors. However, this analysis needs results on which to \nbase unsteady models of the interaction between nonlinear oscillations and species production within a gas \nturbine combustor. In this paper, two methods are explored briefly as an initial step. The first is based on \na configuration of perfectly stirred and plug flow reactors to approximate the flow in a combustion \nchamber. A complete representation of the chemical processes is accommodated, but the geometry is \nsimplified. The second is a full numerical simulation for a realistic geometry, but at this stage the \nchemistry is simplified.
Authors: G. Swenson, W. Pun, F. E. C. Culick
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W437680988