CUED Publications database

Turbulent flame shape switching at conditions relevant for gas turbines

Langella, I and Heinze, J and Swaminathan, N and Behrendt, T and Voigt, L and Zeda, M Turbulent flame shape switching at conditions relevant for gas turbines. In: ASME Turbo Expo, 2019-6-17 to 2019-6-21. (Unpublished)

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A numerical investigation is conducted in this work to shed light on the reasons leading to different flame configurations in gas turbine combustion chambers of aeronautical interest. Large eddy simulations (LES) with a flamelet-based combustion closure are employed for this purpose to simulate the DLR-AT Big Optical Single Sector (BOSS) rig fitted with a Rolls-Royce developmental lean burn injector. The reacting flow field downstream this injector is sensitive to the intricate turbulent-combustion interaction and exhibits two different configurations: (i) a penetrating central jet leading to an M-shape lifted flame; or (ii) a diverging jet leading to a V-shaped flame. First, the LES results are validated using avail- able BOSS rig measurements, and comparisons show that the numerical approach used is consistent and works well. The turbulent-combustion interaction model terms and parameters are then varied systematically to assess the flame behavior. The influences observed are discussed in the paper from physical and modelling perspectives to develop physical under- standing on the flame behavior in practical combustors for both scientific and design purposes.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 18 Apr 2019 01:17
Last Modified: 02 May 2019 01:58