CN-121994662-A - Device for testing particle deposition of radial pre-rotation system

CN121994662ACN 121994662 ACN121994662 ACN 121994662ACN-121994662-A

Abstract

The invention discloses a device for testing particle deposition of a radial pre-rotation system, which solves the problems of uneven air flow distribution, unstable particle introduction and environmental pollution in the prior art. The device comprises a rotating system, a gas collecting system, an air inlet section system, a radial pre-rotating system and an air outlet section collecting system. The rotation system provides a rotating frame for the device. The gas collecting system collects gas and distributes gas flow uniformly in a preliminary step, so that the same side inlet and outlet of the gas flow are realized. The air inlet section is provided with an annular tapered flow passage, the air flow is guided to be transited to the inlet of the pre-rotation nozzle, and the longer air inlet section is favorable for uniform particle introduction. The radial pre-rotation system is the primary test area for particle deposition. The air outlet section is in a funnel shape and is used for discharging air flow and collecting separated particles so as to prevent dust particles from scattering and polluting experimental environment.

Inventors

PENG JIALIN
WANG FEILONG
CHEN WENBIN
HE YIHONG
MAO JUNKUI
ZENG JIAWEI
WANG YUBIN
ZHANG YELIAN
ZHU SHUIHUA

Assignees

南京航空航天大学

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (8)

1. An apparatus for testing radial pre-rotation system particle deposition, comprising: A rotating system forming a basic rotating frame of the test device; the gas collecting system is used for receiving the gas and conveying the gas to the gas inlet section system; the air inlet section system is connected with the gas collecting system and is used for primarily guiding air flow and introducing particles; the radial pre-rotation system is connected with the air inlet section system and is used for pre-rotating the air flow and forming radial flow; And the gas outlet section collecting system is arranged at the outlet of the radial pre-rotation system and is used for collecting the outflow gas and deposited particles.
2. An apparatus for testing particle deposition of a radial pre-rotation system as defined in claim 1, wherein said rotation system comprises: A motor (10) fixedly arranged on the test bed base (12) and outputting a rotary driving force through the rotary shaft (8); a rotation shaft (8) connected to the motor (10); A coupling (9) connecting the motor (10) and the rotating shaft (8) to transmit a rotational moment; the gas collecting system, the gas inlet section system and the gas outlet section collecting system are respectively supported by using a bracket (11).
3. A device for testing particle deposition of a radial pre-rotation system according to claim 1, characterized in that the gas collecting system comprises a gas collecting cavity (2), a plurality of discrete gas inlet holes (1) are arranged on the gas collecting cavity (2), a gas collecting cavity flow channel (21) is arranged inside the gas collecting cavity (2), the discrete gas inlet holes (1) are used for introducing external gas flow into the gas collecting cavity (2), and the flow direction change is realized in the gas collecting cavity (2), so that the gas flow can enter and exit from the same side, and meanwhile, the gas flow is converted into annular gas flow distribution from the discrete gas inlet flow.
4. A device for testing particle deposition in a radial pre-spinning system according to claim 3, characterized in that the air inlet section system comprises an air inlet section (3), the air inlet section (3) comprises an annular tapered flow passage (31) and a pre-spinning nozzle inlet flow passage (344), the annular tapered flow passage (31) starts from a large cross-sectional area from an air collecting cavity flow passage (21) and gradually transits to a small cross-sectional area at the pre-spinning nozzle inlet flow passage (344), particles are fully dispersed before entering the radial pre-spinning system, the pre-spinning nozzle inlet flow passage (344) achieves the effect of air flow pre-spinning, and a sand supply hole (7) is formed on the wall surface of the air inlet section (3) and connected with a dust pipeline for supplying sand grains.
5. Device for testing particle deposition of a radial pre-rotation system according to claim 2, characterized in that the radial pre-rotation system is composed of a back cover plate (4) and a rotor disc (5), a pre-rotation cavity (41) is arranged between the back cover plate (4) and the air inlet section (3), two sides of the pre-rotation cavity (41) are sealed by a comb tooth (43) on the back cover plate (4), the back cover plate (4) and the rotor disc (5) are connected at the inner radius (53) of the rotor disc through a snap interference fit, and simultaneously through bolts are used at the outer radius (52) of the rotor disc, and a rotating shaft (8) is connected with the back cover plate (4) and the rotor disc (5) through keys (42) at the same time so as to keep the concentricity of rotation of the two parts.
6. A device for testing particle deposition of a radial pre-rotation system according to claim 1, characterized in that the gas outlet collection system comprises a gas outlet (6) for drainage, the gas outlet (6) being of funnel-like configuration.
7. An apparatus for testing particle deposition of a radial pre-rotation system according to claim 5, characterized in that the rotor disc (5) and the back cover plate (4) are made of transparent wear resistant material.
8. An apparatus for testing particle deposition of a radial pre-rotation system according to claim 5, characterized in that the rotor disc (5) and the back cover plate (4) are made of an aluminium alloy material.

Description

Device for testing particle deposition of radial pre-rotation system Technical Field The invention belongs to the technical field of engineering thermophysics, and particularly relates to a device for testing particle deposition of a radial pre-rotation system. Background In a turboshaft aeroengine, a secondary air system is an important component for ensuring the normal operation of the engine, wherein a radial pre-rotation system is one of key flow paths. During the running process of the engine, smaller particles easily enter the radial pre-rotation flow channel along with the air flow and enter the disc cavity, deposit on the wall surface of the disc cavity, and long-term accumulation can cause flow path blockage, performance attenuation and even influence the stability of the engine. Therefore, systematic experimental research is carried out on the particle deposition characteristics of the radial pre-rotation system, and the method has important significance for evaluating design rationality, optimizing structural parameters and improving the reliability of the engine. However, the number of the existing radial pre-rotation system test devices is small, and the problem of insufficient design exists generally. Existing test devices typically employ a single-sided inlet air flow pattern, exhaust air from the other side, and collect particles at the outlet through a screen. The structural design ensures that the outflow carries particles to be discharged to the side of the motor, so that the laboratory environment can be polluted, particle erosion and abrasion can be caused to the motor and a related transmission device, and the running stability of equipment and the validity of test data can be influenced. Therefore, how to develop a radial pre-rotation system particle deposition testing device capable of realizing the air flow in and out on the same side, effectively collecting particles and avoiding polluting equipment and environment becomes a key technical problem to be solved at present. Disclosure of Invention The invention aims to provide a device for testing particle deposition of a radial pre-rotation system, so as to explore the particle deposition condition in the radial pre-rotation system in a rotating state and solve the technical problems in the background art. An apparatus for testing radial pre-rotation system particle deposition, comprising: The rotating system forms a basic rotating frame of the test device and provides a rotating motion foundation for the whole system; the gas collecting system is used for receiving the gas and conveying the gas to the gas inlet section system; the air inlet section system is connected with the gas collecting system and is used for primarily guiding air flow and introducing particles; the radial pre-rotation system is connected with the air inlet section system and is used for pre-rotating the air flow and forming radial flow; And the gas outlet section collecting system is arranged at the outlet of the radial pre-rotation system and is used for collecting the outflow gas and deposited particles. Further, the rotation system includes: the test bed base is positioned at the bottom of the device for testing the particle deposition of the radial pre-rotation system and is used for providing fixed support and reducing rotation vibration; the motor is fixedly arranged on the test bed base and outputs rotary driving force through the rotary shaft; the rotating shaft is connected with the motor and used for driving the rear cover plate and the rotor disc to rotate, so that the radial pre-rotation system is rotated; the coupler is connected with the motor and the rotating shaft so as to transmit the rotating moment; the support is responsible for providing the supporting role, and the gas collecting system, the inlet section system and the outlet section collecting system are respectively supported by using the support. The gas collecting system comprises a gas collecting cavity, wherein a plurality of discrete gas inlet holes are formed in the gas collecting cavity, a gas collecting cavity runner is arranged in the gas collecting cavity, the discrete gas inlet holes are used for introducing external gas flow into the gas collecting cavity, and the gas collecting cavity is internally provided with a flow direction change, so that the gas flow can enter and exit from the same side, the influence of sand dust on a rotating system is avoided, and meanwhile, the gas flow is changed into annular gas flow distribution from the discrete gas inlet flow, so that the gas flow is distributed more uniformly in the gas collecting system. Further, the air inlet section system comprises an air inlet section, the air inlet section comprises an annular convergent channel and a pre-spinning nozzle inlet channel, the annular convergent channel starts from a large cross section area through an air collecting cavity channel and gradually transits to a small cross section area at