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

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 adjust