CN112964473A

CN112964473A - Exhaust restrictor for planar cascade flow simulation device

Info

Publication number: CN112964473A
Application number: CN202110306075.2A
Authority: CN
Inventors: 任思源; 魏巍; 马护生; 时培杰; 陈�峰; 宗有海; 李学臣; 黄康; 李聪; 叶敏; 谭锡容; 江辉
Original assignee: Institute of Aerospace Technology of China Aerodynamics Research and Development Center
Current assignee: Institute of Aerospace Technology of China Aerodynamics Research and Development Center
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-06-15

Abstract

The invention discloses an exhaust throttle for a planar cascade flow simulation device. The exhaust restrictor sequentially comprises an exhaust collector, a square turning circle, an expansion joint and an exhaust pressure regulating valve from front to back along the airflow direction, the front end of the exhaust collector is clamped on a plane blade grid test chamber, outlet airflow of the plane blade grid test chamber is collected, the outlet airflow is rectified by the exhaust collector and then guided into a subsequent exhaust system, and the ratio of the area of the maximum cross section of an inlet of the exhaust collector to the area of the outlet is (4-10): 1. the exhaust restrictor is simple in structure, can achieve airflow rectification at the outlet of various plane cascade tests, reduces exhaust resistance, reduces exhaust noise, prevents interference of exhaust to the forward flow field of the test cascade, can assist in adjusting test back pressure of a test section in a plane cascade test cabin, and achieves the purpose of changing the test Reynolds number.

Description

Exhaust restrictor for planar cascade flow simulation device

Technical Field

The invention belongs to the field of basic research and test equipment of aero-engines, and particularly relates to an exhaust restrictor for a plane cascade flow simulation device.

Background

The aerodynamic profile of the rotor/stator blades determines the aerodynamic performance of the aircraft turbine (including fan/compressor and turbine) and the gas turbine, which are key components for maintaining the thermodynamic cycle and generating thrust. In order to design high-performance aero jet engines and gas turbines, the design method and flow characteristics of the turbine need to be studied on the cascade (two-dimensional blade profile) level. In order to carry out the test research on the flow aerodynamic characteristics of the cascade channels under the real flight condition on the ground, ground equipment capable of simulating parameters such as the flow Mach number, the Reynolds number and the like of the cascade channels in the actual flight must be built so as to ensure that a large amount of aerodynamic performance test research and technical verification can be carried out under the condition close to the actual working state, so that the flow mechanism, characteristics and rules in the cascade channels can be analyzed and researched, and a new design scheme is verified.

The exhaust restrictor is one of important components of the plane cascade flow simulation device and plays roles in collecting cascade outlet airflow, rectifying, reducing noise and assisting in adjusting test section backpressure. At present, exhaust collecting components used for a plane cascade flow simulation device at home and abroad have the following defects: 1. the large scale adopts a bell mouth type opening exhaust collecting device, and the noise reduction effect is limited; 2. the requirements of large outlet airflow angle exhaust collection of a turbine blade cascade test are met, the size of a bell mouth is expanded violently, the manufacturing cost is increased greatly, otherwise, the exhaust collection of all the blade cascade tests is difficult to cover, and the exhaust collection effect is not ideal; 3. the bell-mouthed exhaust collecting device can also cause the reflection of exhaust to the forward flow under certain conditions, so that the forward flow field of the test cascade is influenced, and the test error is increased; 4. the opening exhaust collecting device cannot be additionally provided with a back pressure regulating valve, and the auxiliary regulation of the back pressure of the test section cannot be realized.

At present, the closed exhaust throttle device used for the plane cascade flow simulation device and connected with the test section in a sealing mode needs to be developed urgently, exhaust rectification, noise reduction and auxiliary regulation of test backpressure of the test section in the cascade test are achieved, the purpose of auxiliary regulation of the Reynolds number of the test is achieved, and the requirements of basic research and technical verification of advanced aero-engine turbine and gas turbine cascade high-altitude flow simulation aerodynamic performance tests are met.

Disclosure of Invention

The invention aims to provide an exhaust throttle for a plane cascade flow simulation device.

The invention relates to an exhaust restrictor for a plane cascade flow simulation device, which is characterized in that the exhaust restrictor sequentially comprises an exhaust collector, a square rotating circle, an expansion joint and an exhaust pressure regulating valve from front to back along the airflow direction; the front end of the exhaust collector is clamped on the plane blade grid test chamber, the outlet airflow of the plane blade grid test chamber is collected, the outlet airflow is guided into a subsequent exhaust system through the rear end of the exhaust collector after being rectified, and the surface of the exhaust collector is reinforced by rib plates.

Further, the inlet section of the exhaust throttle is in an L-shaped right-angle square shape, the outlet section of the exhaust throttle is in a square shape, and the ratio of the area of the maximum inlet cross section to the area of the outlet is (4-10): 1, the upper profile is a two-dimensional polar curve.

Furthermore, the exhaust collector, the square rotary ring, the expansion joint and the exhaust pressure regulating valve are connected through flanges and are sealed by adopting a metal winding gasket.

Furthermore, the exhaust pressure regulating valve is an annular slit valve.

The exhaust throttle for the plane cascade flow simulation device has the functions of exhaust collection, rectification and noise reduction. During the cascade test, the exhaust restrictor collects the airflow at the outlet of the test chamber, rectifies the disordered airflow at the outlet and guides the rectified airflow into a subsequent exhaust system, so as to prevent the reflection of the airflow at the outlet from interfering with the flow field in front of the cascade of the test cascade; the annular gap valve of the exhaust restrictor also has a throttling function, and can assist in adjusting test back pressure of a test section in the plane cascade test cabin, so that the purpose of changing the test Reynolds number is realized.

The exhaust restrictor for the plane cascade flow simulation device is simple in structure, wide in applicable range of the airflow angle of the outlet of the cascade, high in exhaust efficiency and obvious in noise reduction effect, and can assist in adjusting test back pressure of a test section in a plane cascade test cabin to achieve the purpose of changing the test Reynolds number.

Drawings

Fig. 1 is a perspective view of an exhaust restrictor for a planar cascade flow simulator in accordance with the present invention.

In the figure, 1 is an exhaust collector 2, a square rotating circle 3, an expansion joint 4 and an exhaust pressure regulating valve.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 1, the exhaust restrictor for a planar cascade flow simulator of the present invention sequentially comprises an exhaust collector 1, a square rotation circle 2, an expansion joint 3 and an exhaust pressure regulating valve 4 from front to back along the streamwise direction; the front end of the exhaust collector 1 is clamped on the plane blade grid test chamber, outlet airflow of the plane blade grid test chamber is collected, the outlet airflow is guided into a subsequent exhaust system through the rear end of the exhaust collector 1 after being rectified, and the surface of the exhaust collector 1 is reinforced by rib plates.

Furthermore, the exhaust collector 1, the square rotary ring 2, the expansion joint 3 and the exhaust pressure regulating valve 4 are connected through flanges and sealed by adopting a metal winding gasket.

Further, the exhaust pressure regulating valve 4 is an annular slit valve.

Example 1

The transverse length of the inlet section of the exhaust restrictor is 2284mm, the height is 1903mm, the width is 800mm, the height of the outlet section is 850mm, the width is 800mm, and the ratio of the area of the maximum inlet cross section to the area of the outlet is 4.9: 1; the drift diameter of the expansion joint 3 is 800, the drift diameter of the exhaust pressure regulating valve pipe 4 is 800mm, and the total length of the exhaust restrictor is 12430 mm.

Although embodiments of the present invention have been disclosed above and described in considerable detail, this is not to be understood as a limitation of the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims

1. An exhaust restrictor for a planar cascade flow simulation device is characterized by comprising an exhaust collector (1), a square rotating circle (2), an expansion joint (3) and an exhaust pressure regulating valve (4) from front to back in sequence along the airflow direction; the front end of the exhaust collector (1) is clamped on the plane blade grid test chamber, outlet airflow of the plane blade grid test chamber is collected, the outlet airflow is guided into a subsequent exhaust system through the rear end of the exhaust collector (1) after rectification, and the surface of the exhaust collector (1) is reinforced by rib plates.

2. The exhaust restrictor for a planar cascade flow simulation device according to claim 1, wherein the inlet section of the exhaust restrictor is an L-shaped right-angled square, the outlet section of the exhaust restrictor is a square, and the ratio of the area of the maximum inlet cross section to the area of the outlet is (4-10): 1, the upper profile is a two-dimensional polar curve.

3. The exhaust restrictor for a planar cascade flow simulator according to claim 1, wherein the exhaust collector (1), the square-turn round (2), the expansion joint (3) and the exhaust pressure regulating valve (4) are connected by flanges and sealed by a metal wound gasket.

4. The exhaust restrictor for a planar cascade flow simulator according to claim 1, characterized in that the exhaust pressure regulating valve (4) is an annular slit valve.