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Augmentation of turbulence and mixing in gas turbine combustors by introducing unsteady effects

Mohd. Jaafar, Mohammad Nazri and Y. A., Eldrainy and H. S., Aly and K. M., Saqr (2010) Augmentation of turbulence and mixing in gas turbine combustors by introducing unsteady effects. In: Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies, MIMT 2010, 2010, Sanya, China.

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Official URL: http://dx.doi.org/10.1115/1.859544.paper78

Abstract

Turbulence production and mixing are crucial for flame stability in gas turbine combustors. Designers have relied on fixed geometry swirlers to introduce a tangential component to the inlet air flow in order to sustain a central recirculation zone able to enhance the mixing process and stabilize the flame. In this paper we propose a novel swirler for gas turbine combustors. The new swirler concept is composed of a conventional vane swirler and a rotating element which interrupts the swirling flow. Such unsteady interruption enhances the turbulence and mixing characteristics of the swirling flow. The novel concept is assessed by performing four numerical simulations at four different angular velocities for the rotating element which are 0, 240, 480, and 960 rpm. A trend of increasing turbulence kinetic energy with the rotating element angular velocity was observed.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:CFD, turbulence, swirling flow, combustors, unsteady effects
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:27121
Deposited By: Liza Porijo
Deposited On:27 Jul 2012 07:26
Last Modified:27 Jul 2012 07:26

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