Testing stand for dynamic airflow response in single/double duct mode switching process

Abstract

The invention discloses a testing stand for the dynamic airflow response in the single / double duct mode switching process. The testing stand mainly comprises a large-power centrifugal blower fan, an expansion segment, a stabilization segment, a contraction segment and a test segment, the centrifugal blower fan serves as an air source and provides continuous and stable airflow for the test segment, the airflow flown out of the centrifugal blower fan is expanded by the expansion segment, flows into the stabilization segment, is contracted by the contraction segment, flows into the test segment and is discharged finally. According to the method, the dynamic airflow response rule in the mode switching process can be researched in the design phase of a variable cycle engine, and the dynamic change rule of the airflow parameters can be obtained in the engine mode switching process.

Description

technical field [0001] The invention relates to a test bench and a test method suitable for studying the dynamic response of air flow during the single / double duct mode conversion process of a variable cycle gas turbine engine, and belongs to the technical field of aeroengine and fluid parameter measurement. Background technique [0002] In recent years, the variable cycle engine, which combines the advantages of turbofan engine and turbojet engine, has gradually shown its superiority and potential, and has become a key technology that all countries in the world are committed to research in the new round of aero engine competition. The working mode of the single / double duct variable cycle engine is directly determined by the opening degree of its mode selection valve. In the dynamic process of mode selection valve opening changes, the inner and outer bypass flow rates and bypass ratios change in a very short period of time, which in turn causes changes in the operating point...

AI Technical Summary

Problems solved by technology

[0005] (1) High risk: Carrying out this kind of research directly on the engine has huge risks. If the dynamic response law of the airflow is not grasped, it may lead to improper setting of the mode conversion law, which will lead to engine panting during the test. vibration and other unstable phenomena, thus seriously threatening the safety of engine test pieces, test benches and test personnel

[0006] (2) High cost: Engine testing requires a lot of manpower and material resources. If all similar problems can only be studied through engine testing, it must be unaffordable for engine development

[0007] (3) Long research cycle: If you want to study such problems through engine tests, you must wait until the engine design and processing are completed, which will inevitably lead to a long research cycle

[0008] (4) The measurement data is not rich: Due to the structural limitations of the engine itself, it is impossible to install enough probes and sensors on the engine, so the obtained data cannot be very rich

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