Diffuser with rectifying plate and application thereof

Abstract

The invention discloses a diffuser with a rectifying plate and application of the diffuser, and belongs to the field of combustion chambers of gas turbines. The diffuser sequentially comprises a front diffuser body, a rectifying plate, a sudden expansion diffusion section, a flame tube, an inner ring cavity and an outer ring cavity in the axial direction, wherein the rectifying plate is located in the sudden expansion diffusion section, opposite to an outlet of the front diffuser body 1, perpendicular to the axial direction of the combustion chamber, and comprises a flow guide hole and a flow guide plate; a plurality of flow guide holes are arranged in one-to-one correspondence with flame tube heads on a combustion chamber, and comprise a circular hole in the center, a fan-shaped hole, a small cooling hole and a flow guide plate; the guide plate comprises an upper plate and a lower plate which are symmetrically arranged at the upper end and the lower end of the rectifying plate, and the inclination angle is alpha. The total pressure loss in the diffuser can be effectively reduced, useless loss in a combustion chamber is reduced, the fuel consumption rate is reduced, and the total pressure loss is also within the bearable range when the inlet Mach number is high; and meanwhile, the airflow flows into all downstream parts after being reasonably and accurately distributed, so that the pneumatic needs of an advanced combustion chamber are further met.

Description

technical field [0001] The invention belongs to the field of combustion chambers of gas turbines, and in particular relates to a diffuser with a rectifying plate and its application. Background technique [0002] Compressor, combustor and turbine are the three core components of an aero-engine. In the thermodynamic cycle of the engine, the combustion chamber completes the constant pressure heating process. Its main function is to release the chemical energy in the fuel and convert it into heat energy, so as to increase the total enthalpy of the gas and increase the work done by the expansion of the gas in the turbine and tail nozzle. Ability. From this point of view, the quality of the combustion chamber directly affects the work and performance of the engine, so the performance of the combustion chamber directly determines the quality of the engine. [0003] Most of the aero-engine compressor outlet airflow velocity is 170m / s or higher, and it is impossible to burn stably...

AI Technical Summary

Problems solved by technology

[0004] In the last century, the United States NACA Report 949 proposed a method to solve the flow separation problem of a large expansion angle conical diffuser, that is, to place a flow baffle somewhere in the diffuser, and the baffle has the same size and uniform Arranged holes, this baffle is equivalent to a turbulence generator, which can increase the turbulence of the downstream flow, thereby inhibiting the separation in the diffuser with a large cone angle and improving the performance of the diffuser; however, this structure cannot affect the flow. Distribution, can only solve the flow separation of large cone angle diffusers, not applicable to other advanced combustion chambers

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