Experimental study of the flame tube temperature state of a gas turbine engine multi-nozzle combustion chamber

Аuthors

Baklanov A. V.

Kazan National Research Technical University named after A.N. Tupolev, 10, Karl Marks str., Kazan, 420111, Russia

e-mail: andreybaklanov@bk.ru

Abstract

The flame tube walls cooling is one of the important components while organizing processes in the gas turbine combustion chamber. The combustion chamber operation reliability and engine endurance as a whole depend on the effective flame tube walls cooling. Convective-film cooling is one of the most widespread cooling systems. It includes the air film forming, which does not allow the hot gas interaction with metal and drawing heat from the backside of the wall due to the convection. The article presents the results of the studies on the flame tube walls temperature determining of the gas turbine engine operating on the gaseous fuel.

The article presents the combustion chamber structure of the converted aviation gas turbine engine serving as the gas pumping unit supercharger drive. The combustion chamber walls preparation and its testing as a part of a gas turbine engine were performed. The article presents the results on the flame tube walls temperature for the two operation modes of the gas turbine installation corresponding to 16 and 18 MW. The analysis of the obtained results allowed revealing that with the gas turbine installation power increase from 16 to 18 MW the temperature state of the wall did not drastically change. The walls temperature at the considered modes does not exceed 800°С, which indicates the flame tube sufficient cooling. However, the temperature distribution in various cross-sections was not of the similar nature. In some cross-sections maximum compared to the other cross-sections temperature was observed. It can be explained by the fact that the air passed through the conduit is split upon the hole flanging forming a vortex flow. As a result, the film-cooling loses its effectiveness, and the wall temperature behind the hole increases. The film-cooling effectiveness was determined at various sections on the flame tube walls. A technique for the wall temperature computing was developed, and comparison of computational and experimental results was performed.

Keywords:

combustion chamber, walls cooling system, walls preparation

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