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Venturi nozzle air flow calibration method for overall test of aero-engine

A Venturi nozzle and aero-engine technology, used in engine testing, jet engine testing, gas turbine engine testing, etc., can solve the problem of high requirements for accurate measurement of air flow, and meet calibration requirements, strong applicability, and high calibration accuracy. Effect

Active Publication Date: 2019-03-22
AECC SICHUAN GAS TURBINE RES INST
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Problems solved by technology

[0005] Aiming at the problem that the high-altitude simulation test of the engine has high requirements for the accurate measurement of the air flow, this patent proposes a method for calibrating the air flow of the Venturi nozzle for the whole machine test of the aero-engine

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  • Venturi nozzle air flow calibration method for overall test of aero-engine

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Embodiment Construction

[0015] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] Because the large bypass is larger than the general structural size of the turbofan engine, during the high-altitude bench test, the air flow measurement process pipeline is connected to the engine inlet, and the structural size is also larger. For the calibration of the air flow measurement process duct of the engine inlet of the high-altitude platform that is larger than 1 meter, or even close to 3 meters, there is no laboratory condition for independent calibration at home and abroad. For this reason, the present invention aims to rely on the high-altitude test capability, and for the first time proposes the scheme of on-site calibration on the high-altitude platform, and can realize the air flow calibration of the altitude velocity characteristic within the full envelope of the engine. calibration within the range.

[0017] In th...

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Abstract

The invention discloses a Venturi nozzle air flow calibration method for an overall test of an aero-engine. Critical flow Venturi nozzle set calibration devices are installed in a high-altitude platform air inlet pressure stabilizing chamber in a parallel connection mode, nozzle sets are composed of multiple Venturi nozzle with the equal throat area, clapboards are uniformly embedded in the circumferential direction, and the number of the nozzles is determined according to the gas supply source capability of a high-altitude platform and throttling characteristics of the main tested engine; anoverall calibration device is connected with the pressure stabilizing chamber through a flange structure, the calibration device is provided with rectification grids front and back, and air flow testlayout is conducted according to the standard requirement of each critical flow Venturi nozzle; under a given pressure condition, according to the size of actual calibration air flow, a remote controlmode is adopted for adjusting the number of opened and closed nozzles, and during adjustment, the nozzles are put to the periphery at first and then put to the middle; the same calibration air flow is calibrated through two modes of adjusting the number of the nozzles and the upstream-and-downstream pressure ratio of the nozzles, and the standard air flow of each calibration point is the sum of measured air flow of the opened nozzles.

Description

Technical field: [0001] This patent relates to the technical field of aero-engine testing and testing, in particular to a method for calibrating the air flow of a Venturi nozzle in an aero-engine machine test. Background technique [0002] Air flow measurement is one of the main performance measurement parameters in the whole machine test of aero-engine. The current machine test bench measurement method mainly adopts pressure difference-area straight pipe device and critical flow Venturi nozzle combination device. Among them, the air flow measurement method of pressure difference-area straight pipe device has the disadvantages of low air flow measurement accuracy at low speed and high requirements for pressure measurement accuracy. The air flow measurement method of critical flow Venturi nozzle combination has high measurement accuracy, which is better than 0.5%. [0003] For large-caliber (especially diameter > 1 meter) imported engines, there is no corresponding calibra...

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Application Information

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IPC IPC(8): G01F25/00G01M15/14G01M15/02
CPCG01M15/02G01M15/14G01F25/15
Inventor 苏金友袁世辉田金虎侯鑫正陈廷千李康仇钎
Owner AECC SICHUAN GAS TURBINE RES INST
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