RU178985U1 - BENCH FOR TESTING COMBUSTION CHAMBERS OF GAS-TURBINE ENGINES - Google Patents

Abstract

The invention relates to devices for testing and adjusting the combustion chambers of gas turbine engines. A test bench for testing the combustion chambers of gas turbine engines, containing a casing with a test combustion chamber located in its cavity, connected to it and communicating with it at the inlet - an air supply pipe, at the output - a water injection manifold and a cooled exhaust duct with a control throttle installed therein. On this stand, between the casing with the test combustion chamber and the water injection manifold, an additional simulator of the blades of the turbine nozzle apparatus is additionally installed. Thus, the implementation of the proposed utility model with the above distinguishing features, together with the known features, allows the stand equipment to be protected from damage by dynamic loads during pulsating combustion , to exclude the influence of the stand on the characteristics of the test combustion chamber, to reduce the irrevocable flow of injected water due to reduce the mass of oscillating gas.

Description

The invention relates to devices for testing and tuning combustion chambers of gas turbine engines.

A known bench for testing combustion chambers (Patent SU 1040901, IPC G01M 15/00, publ. 12/23/1991), adopted as a prototype.

The specified stand for testing the combustion chambers of gas turbine engines, contains a casing with a test combustion chamber located in its cavity, connected to it and communicating with it at the inlet - an air supply pipe, at the exit - a water injection manifold and a cooled exhaust pipe with a regulating throttle installed in it mounted on the casing ripple sensor, flow regulator.

The stand works as follows.

Air and fuel are fed into the test combustion chamber, the mixture is ignited, the gas flow is regulated by a regulating throttle. In the event of vibrational combustion, the signal from the sensor through the converter is fed to the flow regulator, which ensures the supply of the required amount of water through the water injection manifold to the cooled exhaust gas channel in order to reduce pressure fluctuations to a safe value.

A disadvantage of the known stand is the presence of an acoustic connection between the cavity of the casing with the test combustion chamber and the cooled exhaust channel, leading to the mutual influence of the characteristics of the stand and the characteristics of the test combustion chamber and distortion of the latter, high irrevocable flow rate of the injected water, due to the need to affect the total mass of the vibrating gas in the cavities of the test combustion chamber and the cooled exhaust gas channel.

The technical task of the claimed utility model is to protect the equipment of the bench from damage by dynamic loads during pulsating combustion, eliminating the influence on the characteristics of the test combustion chamber, reducing the irrevocable flow rate of the injected water.

The technical result is achieved by the fact that on the test bench for the combustion chambers of gas turbine engines, containing a casing with a combustion chamber located in its cavity, connected to it and communicating with it at the inlet is an air supply pipe, at the output there is a water injection manifold and a cooled exhaust pipe with a regulating throttle installed in it, according to a utility model, between the casing with the test combustion chamber and the water injection manifold, a simulator of the blades of the turbine nozzle apparatus is installed.

The stand contains a casing 1 with a test combustion chamber 2 located in its cavity, connected to it and communicating with it at the inlet - an air supply pipe 3, at the output - a simulator of the blades of the nozzle apparatus of the turbine 7, a water injection manifold 6 and a cooled gas outlet 4 with a control throttle 5.

In the proposed utility model, in contrast to the prototype, a simulator of the blades of the turbine nozzle apparatus is installed, forming a critical passage area - Fcrit., In which a supersonic seal jump occurs, which provides acoustic decoupling of the cavities of the tested combustion chamber and gas duct.

In FIG. 1 - a diagram of the stand

The stand works as follows.

Air and fuel are supplied to the test combustion chamber 2, the mixture is ignited, the gas flow is regulated by the regulating throttle 5. If vibration (pulsation) combustion occurs in the test combustion chamber 2, gas pressure pulsations are almost completely reflected from the simulator of the blades of the nozzle apparatus of the turbine 7 and the shock wave critical section - Fcrit. A small fraction of the pulsating (acoustic) energy that has passed through the shock wave is damped by the minimum flow rate of injected water through the water injection manifold 6.

Thus, the implementation of the proposed utility model with the above distinguishing features, together with the known features, allows to protect the test bench equipment from damage by dynamic loads during pulsed combustion in the test combustion chamber, to exclude the influence of the test bench on the characteristics of the test combustion chamber, and to reduce the irrevocable flow of injected water from for reducing the mass of oscillating gases.

Claims (1)

A test bench for the combustion chambers of gas turbine engines, comprising a casing with a combustion chamber located in its cavity, connected to it and communicating with it at the inlet - an air supply pipe, at the outlet - a water injection manifold and a cooled exhaust pipe with a regulating throttle installed in it, characterized in that between the casing with the test combustion chamber and the water injection manifold, an additional simulator of the blades of the turbine nozzle apparatus is additionally installed.

Images