Design Parameters Impact on the Combustion Completeness of the Evaporation Combustion Chamber

Аuthors

Khaliulin R. R.

Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia

e-mail: rrkhaliulin@kai.ru

Abstract

As of today, the fuel efficiency improving of the short-life small-size gas turbine engines (SGTE) is a pressing issue, requiring consideration of design differences from long-term engines and operational features, primarily the combustion chamber. Designing a SGTE combustion chamber requires addressing a number of critical issues related to cooling, flame stabilization due to the high velocities, and residence time reducing of the working fluid. This article presents the results of theoretical and computational research on the design of an evaporative combustion chamber for a SGTE with a thrust of 600 N. The presented combustion chamber design stages (thermogasdynamic computation, one-dimensional computation and numerical computation) allow for the rapid development of a combustion chamber design. The combustion efficiency coefficient was selected as the combustion chamber efficiency criterion. The initial combustion chamber layout was obtained based on the results of the thermogasdynamic calculation. One-dimensional computations were used to study the secondary air supply optimal location and its quantity. During numerical modeling phase, the effect of the orifice area to the outlet cross-sectional area ratio of the combustion chamber was studied. These parametric studies allowed evaluating the relative area impact on the in-chamber processes during the dual-zone combustion. Variation in fuel combustion efficiency along the flame tube length was demonstrated. Good agreement between the research results and those of other authors was achieved.
The obtained results allow for practical application in the design of combustion chambers for small gas turbine engines and their components, such as the flame tube, when determining operating and design parameters with account for the application area.

Keywords:

secondary air distribution, excess air ratio, two-zone combustion, completeness of fuel combustion

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