Gas introducing device before gas turbine

Abstract

The invention provides a gas introducing device before a gas turbine. The gas introducing device before the gas turbine comprises a volute and a bypass gas introducing slot part; the volute comprises junction surfaces and a gas introducing opening; the bypass gas introducing slot part is located at the upper part of a turbine flow passage section along an axial direction, is connected with the turbine flow passage section and is circumferentially connected with the junction surfaces of the volute; a part, within a connection position of the junction surfaces of the volute, of the outer peripheral face of the bypass gas introducing slot part and the volute together form a drainage flow passage circumferentially encircling the bypass gas introducing slot part; gas introducing slot openings which are arranged along a circumferential direction and penetrate through the bypass gas introducing slot part are formed in the part of the outer peripheral face of the bypass gas introducing slot part; the gas introducing slot openings, the drainage flow passage and an inner cavity of the turbine flow passage section communicate. According to the gas introducing device before the gas turbine, provided by the invention, gas discharged from an engine is evenly introduced into the volute, so that flow losses are avoided, power of the gas turbine is increased, an overall expansion ratio of a two-stage turbine is increased, and moreover, influence of gas introducing inlet pressure and gas introducing mixing on performance of the gas turbine and a power turbine is reduced.

Description

technical field

[0001] The invention relates to the technical fields of aviation, navigation and land vehicle equipment, in particular to a gas turbine vortex pre-bleed air device. Background technique

[0002] The turbo piston engine is an engine that works in a combined cycle of a diesel engine and a gas turbine. It combines the advantages of low fuel consumption of a diesel engine and high power density of a gas turbine, and is one of the important trends in the development of high power density engines. When the turbo piston engine works in the combined mode of diesel engine and gas turbine, it is necessary to introduce the exhaust gas of the diesel engine into the turbine system of the gas turbine to recover the exhaust energy of the diesel engine and improve the fuel economy of the combined cycle engine. The bleed air directly affects the outlet pressure of the combustion chamber of the gas turbine and the exhaust back pressure of the diesel engine, and has an importan...

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