Adjustable fan-shaped plate flow field distortion simulator

Abstract

The invention belongs to the technical field of aero-turbine engines, particularly relates to an air inlet flow field distortion simulation device used for aero-turbine engine tests, and particularly relates to an adjustable fan-shaped plate flow field distortion simulator. The distortion simulator is applied to an engine air inlet distortion resistance test and an engine surge test. Compared with the exiting distortion simulator, the device has the following advantages that the adjustable distortion simulator adopts the adjustable fan-shaped plate mode according to the use requirements of a turbofan engine, and the angle of the fan-shaped plate is adjustable. The structural form is domestically used for the first time; the state of distortion simulation is changed through mechanical transmission, and the structural form and the sealing performance of the device are better than those of other forms of adjustable simulators; and the test efficiency is high, and multiple engine air inlet distribution state tests can be completed in one test so that the test cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of aero-turbine engines, in particular to an air intake flow field distortion simulation device for aero-turbine engine tests, in particular to an adjustable fan-shaped plate flow field distortion simulator. Background technique [0002] Stability is one of the important indicators of aero turbine engines, and the external destabilizing factor that has the greatest impact on engine stability is pressure distortion. At present, the plate simulation method is widely used in China to provide the pressure distortion flow field for the engine intake / engine matching test. The most common method is to install a plate simulation device upstream of the engine. The air flow passes through the plate to form a low pressure area, and the edge of the plate forms a turbulent flow. The inlet produces circumferential total pressure distortion and turbulent flow in order to simulate the flow field characteristics of the inlet...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to achieve the specified distortion index and carry out the engine wheezing test, it is often necessary to carry out multiple rounds of attempts on plates with different clogging ratios, which consumes a lot of manpower and material resources, and the work efficiency is low;

[0005] 2. The installation operation is complicated. Every time the distortion simulation state is changed, the distortion simulation board needs to be disassembled and re-sealed; since only one distortion state test can be done in one test, it takes a long time to complete all the calibration tests of a set of distortion simulators. Long, high test cost

[0007] 1. The hydraulic control system is complicated, the simulation device is bulky, and the construction cost and maintenance cost are high;

[0008] 2 The hydraulic system must be comprehensively inspected for each test, and the test preparation time is long;

[0009] 3 Transmission displacement accuracy is low

[0011] 1. The electric push rod transmission box is large in size and low in space utilization, which limits the use of the distortion simulator mold to a certain extent;

[0012] 2 It is difficult to ensure the axial direction and positioning of the simulation board in space, and the verticality of the simulation board inside the flow channel cannot be guaranteed

[0013] Whether it is the first type or the second type of movable distortion simulator, the simulation board of the core device mostly adopts the plate type, and the shape of the board is basically a meniscus or a crescent plate. The advantage of this type of simulation board is that it can produce a strong enough comprehensive Distortion, but for the engine test pipeline with small axial space, due to its strong ability to generate distortion and slow mixing of airflow behind the plate, the degree of backflow will be increased accordingly, which will adversely affect the accuracy of total pressure field measurement and affect the operation of the engine. unfavorable

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