Test results of washing-out of coked atomizers of NK family combustion chambers by mixture of kerosene with technical detergent

Thermal engines, electric propulsion and power plants for flying vehicles


Аuthors

Markushin A. N.1, Baklanov A. V.2*

1. Kazan Motor Production Association, 1, Dementyeva str., Kazan, 420036, Russia
2. Kazan National Research Technical University named after A.N. Tupolev, KNRTU-KAI, 10, Karl Marks str., Kazan, 420111, Russia

*e-mail: andreybaklanov@bk.ru

Abstract

Ensuring reliable and failure-free performance of a gas turbine is the most foreground task for aeronautical engineering manufacturer. The combustion chamber is the most thermo-stressed part of the gas turbine with a great number of complicated gas-dynamic and thermodynamic process. Thus, the reliability of a gas turbine in many respects depends on a combustion chamber reliability. While aviation gas turbine with a multi-atomizer combustion chamber operation the combustion chamber fuel supply lines are subjected to coking due to low thermal stability of the supplied the fuel. It leads to premature engine removal. For this reason, the article presents the results of works on washing-out the partially coked atomizer by various of kerosene-technical detergent mixtures to define the more efficient of this mixture composition. The method of washing have been chosen due to the addition an antioxidant additive to fuel, or periodical combustion chamber washing-out by kerosene in mixture with active agents allowing decompose a carbon formation and a resinous depositing, as well as remove them together with fuel. The article describes the structure of the test bench and single-atomizer combustion chamber section, which was employed for testing eight partially coked nozzles. The article presents also the tests operation modes.

The results of the study revealed that the fuel mixture with technical detergent effectively removes deposits of thermal fuel decomposition from the coked atomizers. The maximum efficiency of carbon removing was obtained with the mixture of kerosene with 10-15% of technical detergent.

It follows, that this method is effective for realizing an atomizer channels cleaning channels, and may be recommended for application while the routine maintenance of gas turbine operating on liquid hydrocarbon fuel such as kerosene or diesel oil.

Keywords:

combustion chamber, experiment, atomizer, gas-turbine engine, coking, washing-out, technical detergent

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