Pneumatic method for uniform air-fuel mixture preparation in GTE combustor

Аuthors

Siluyanova M. V.^1*, Chelebyan O. G.^2**

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Central Institute of Aviation Motors, CIAM, 2, Aviamotornaya St., Moscow, 111116, Russia

*e-mail: dc2mati@yandex.ru
**e-mail: oganes441@gmail.com

Abstract

The main objective of the research, aimed at developing combustors for civil aviation, consists in ensuring competitive level of engines emission characteristics. The presented work is dedicated to the development of technology for uniform air-fuel mixture preparation in the flame tube head with respect to aircraft combustion chamber.

Gas turbine engine aggregate characteristic guarantee, such as reliable start-up, wide range of stable operation, fuel combustion efficiency and low noxious emission depend in particular on combustor reliable operation. The researches in this field for the most part are agreed herein that achieving high-level of the above said characteristics in the combustor is stipulated, not after all the others, by liquid fuel crushing process quality and its preliminary mixing with air in the flame tube head. It is known that combustion of previously prepared homogeneous air-fuel mixture in model heat generators allows obtain low outlet noxious emission. However, real GTE combustor has no place or the time for such preparation. It stands to reason, that it is necessary the employ the available space and the residence time maximally to direct the air-fuel mixture characteristics drift towards a homogeneous composition.

This work presents the results of the designed flame tube head with liquid fuel pneumatic atomizer for low-emission combustor. The paper describes the air-fuel uniform mixture preparation technique in the flame tube head with fine-dispersed spray in swirl flow conditions.

Autonomous tests of the developed the flame tube head have been conducted. In the course of these tests the main characteristics of the air-fuel spray formed after burner by a non-contact laser diagnostics method in open space conditions were studied. According to the results of cold tests, the average Zauter diameter of the fuel droplets in the idle mode is about 23 microns. The wide and intense backflow zone is formed near the device axis. To test the developed device and method of air -fuel mixture preparation, fire tests in the model three-burner compartment under high-pressure environment were carried out. The ignition and blowout points under earth conditions have been obtained as the result of tests conducted. The efficiency of lean air-fuel mixture combustion technology has been confirmed.

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Keywords:

front module, pneumatic method, air-fuel mixture, atomizer, crushing, spray

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