Paper 15: The Design of Tubular Gas Turbine Combustion Chambers for Optimum Mixing Performance

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Abstract
A method is presented for determining the ideal ratio of flame-tube diameter to air-casing diameter, and the optimum number and size of dilution holes, for the attainment of a well-mixed primary combustion zone and the most uniform distribution of exhaust gas temperature for tubular gas turbine combustion chambers. The method employs data accumulated from a series of experimental investigations carried out on the flow and mixing characteristics of cold air jets when injected into a hot gas stream. Graphs are included to facilitate the design procedure and to illustrate the relative importance to mixing performance of various factors such as overall pressure loss, airflow distribution and diffuser pressure loss coefficient.

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