Exhaust throttler for plane cascade flow simulation device

Abstract

The invention discloses an exhaust throttler for a plane cascade flow simulation device. The exhaust throttler sequentially comprises an exhaust collector, a square-to-round part, an expansion joint and an exhaust pressure regulating valve from front to back in the airflow direction; the front end of the exhaust collector is clamped on the plane cascade test chamber to collect outlet airflow of the plane cascade test chamber, the outlet airflow is rectified through the exhaust collector and then guided into a subsequent exhaust system, and the ratio of the area of the maximum cross section of the inlet of the exhaust collector to the area of an outlet is (4-10):1. The exhaust throttler is simple in structure, not only can realize outlet airflow rectification, exhaust resistance reduction and exhaust noise reduction of various plane cascade tests and prevent the interference of incoming flow reflection of exhaust to a flow field in front of a test cascade, but also can assist in adjusting the test back pressure of a test section in a plane cascade test cabin and fulfill the aim of changing the test Reynolds number.

Description

technical field [0001] The invention belongs to the field of aero-engine basic research test equipment, and in particular relates to an exhaust restrictor used for a planar cascade flow simulation device. Background technique [0002] Aviation turbines (including fans / compressors and turbines) and gas turbines are key components for maintaining thermal cycles and generating thrust, and the aerodynamic shape of their rotor / stator blades determines the aerodynamic performance of aviation turbines and gas turbines. In order to design high-performance aerojet engines and gas turbines, it is necessary to study the design method and flow characteristics of the turbine at the cascade (two-dimensional airfoil) level. In order to conduct experimental research on the aerodynamic characteristics of cascade passage flow under real flight conditions on the ground, it is necessary to build ground equipment that can simulate parameters such as the Mach number and Reynolds number of the cas...

AI Technical Summary

Problems solved by technology

At present, the exhaust gas collection components used in the plane cascade flow simulation device at home and abroad have the following disadvantages: 1. Most of them use bell-shaped opening exhaust gas collection devices, and the noise reduction effect is limited; 2. To meet the large outlet airflow angle of the turbine cascade test Exhaust collection, the size of the bell mouth expands drastically, and the manufacturing cost will increase. Otherwise, it will be difficult to cover the exhaust collection of all cascade tests, and the exhaust collection effect is not ideal; 3. The bell mouth exhaust collection device is in some cases It may also cause the reflection of the exhaust to the incoming flow, thereby affecting the flow field in front of the test cascade, resulting in an increase in the test error; 4. The opening exhaust collection device cannot be equipped with a back pressure regulating valve, nor can it realize the auxiliary adjustment of the back pressure of the test section

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