Combustion Rumble Prediction with Integrated Computational-Fluid-Dynamics/Low-Order-Model Methods
| Autor: | Zhaopu Yao, K. N. C. Bray, Min Zhu, Yuan Gao, Ann P. Dowling |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Engineering
business.industry Oscillation Mechanical Engineering Aerospace Engineering Mechanical engineering Mechanics Acoustic wave Computational fluid dynamics Combustion Physics::Fluid Dynamics Acoustic theory Fuel Technology Space and Planetary Science Combustor Combustion chamber business Reynolds-averaged Navier–Stokes equations |
| Zdroj: | Journal of Propulsion and Power. 28:1015-1025 |
| ISSN: | 1533-3876 0748-4658 |
| DOI: | 10.2514/1.b34469 |
| Popis: | The pressure oscillation within combustion chambers of aeroengines and industrial gas turbines is a major technical challenge to the development of high-performance and low-emission propulsion systems. In this paper, an approach integrating computational fluid dynamics and one-dimensional linear stability analysis is developed to predict the modes of oscillation in a combustor and their frequencies and growth rates. Linear acoustic theory was used to describe the acoustic waves propagating upstream and downstream of the combustion zone, which enables the computational fluid dynamics calculation to be efficiently concentrated on the combustion zone. A combustion oscillation was found to occur with its predicted frequency in agreement with experimental measurements. Furthermore, results from the computational fluid dynamics calculation provide the flame transfer function to describe unsteady heat release rate. Departures from ideal one-dimensional flows are described by shape factors. Combined with this information, low-order models can work out the possible oscillation modes and their initial growth rates. The approach developed here can be used in more general situations for the analysis of combustion oscillations. Copyright © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|