Icing wind tunnel hot gas anti-icing test high-precision simulation method and device

Abstract

The present invention discloses an icing wind tunnel hot gas anti-icing test high-precision simulation method and device. The device comprises a gas source, a pressure reduction device, a filter, an air heater, a multistage electric heating device and a test section in order from a gas input direction to a gas output direction. The gas path behind the pressure reduction device is divided into two paths, one path is heated and then is subjected to flow mixing with the other unheated path, a pneumatic switching valve in an icing wind tunnel plenum chamber is configured to divide the gas path into two paths, gas of one path enters a test section and flows out after passing through a test model to perform flow measurement, gas of the other path is flown through from the external portion of the test section and performs flow measurement, and gas of a model main path and gas of a simulation bypass path are combined into one path after passing through the wind tunnel test section and are exhausted through a flowmeter and a silencer; a cold and hot gas mixing mode is employed to rapidly reduce the high-pressure hot gas behind the air heater so as to reach the effect of rapid temperature adjustment; and the multistage electric heating device is employed to perform high-precision temperature regulation and control so as to perform high-precision temperature adjustment of high-pressure hot gas prior to the high-pressure hot gas entering a test model step by step.

Description

Technical field [0001] The invention relates to the field of wind tunnel testing, in particular to a method and device for conducting icing detection on various objects that are prone to icing under high-altitude icing weather conditions. Background technique [0002] Icing is a widespread physical phenomenon in flight practice and one of the main hidden dangers that cause flight safety accidents. When the aircraft is flying under the icy weather conditions where the ambient temperature is lower than the freezing point or near the freezing point, the super-cooled water droplets in the atmosphere hit the surface of the aircraft, and the icing phenomenon is easily on the wing, tail, rotor, intake duct, etc. Windshield, radome, instrument sensors and other parts of the surface. The icing of the aircraft not only increases the weight of the aircraft, but also destroys the aerodynamic shape of the surface of the aircraft, changes the flow field around the flow, and destroys the aerod...

AI Technical Summary

Problems solved by technology

The icing of the aircraft not only increases the weight of the aircraft, but also destroys the aerodynamic shape of the aircraft surface, changes the surrounding flow field, and destroys the aerodynamic performance, resulting in a decrease in the maximum lift of the aircraft, an increase in flight resistance, a decrease in operability, and a decrease in stability. Flight safety poses a great threat. Flight accidents caused by icing are common, and severe icing can even lead to aircraft crashes and fatalities.

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