Trial Test Results on Intake Manifold Mounting Elements of the Combustion Chamber of the NK-38ST Gas Turbine Engine

Providing error-free performance is a pertinent issue to engine developers. The main parameters and application of the NK-38ST gas turbine engine are described in this article. A case of fuel pipe rupture in the intake manifold mounting system of the combustion chamber of the NK-38ST engine when conducting user acceptance testing is examined. The design of the combustion chamber with the existing intake manifold mounting system is presented. Using the strain-gage testing data, areas of increased mechanical stresses are identified. It is established that the reason for the occurrence of increased stresses in the fuel pipes can be excessive rigidity of the mounting structure that secures the intake manifold to the combustion chamber housing. This structure does not allow equilibrizing thermal expansion of the core engine. A new design for the intake manifold mounting system is proposed that comprises brackets with collapsible rods. Test results of the new system are presented. The results confirm the efficiency of the new system and demonstrate a decrease in the level of mechanical stresses in the fuel pipes by 1.6–13 times.

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