Hail absorption test method of civil aviation turbofan engine under open-air test bed

Abstract

The invention discloses a hail absorption test method of a civil aviation turbofan engine under an open-air test bed. The hail absorption test method comprises engine hail absorption test point confirmation, hail speed and hail quantity confirmation methods, hail speed measurement, hail impact position accuracy measurement and confirmation methods, engine hail absorption test processes and conformance criteria. The hail absorption test method is suitable for a hail absorption test of a civil turbofan engine open-air test bed. The hail absorption test is divided into a single hail absorption test and a continuous hail absorption test. The single hail absorption test is a demonstration and verification test for the engine to inhale a single large hail, and the continuous hail absorption testis a demonstration and verification test for the engine to inhale a large number of small-size hails continuously. By adopting the hail absorption test method, the requirements of airworthiness evidence collection (qualified approval) hail absorption tests can be met, and the test method is safe, reliable and comprehensive in engine state assessment, and meets the requirements of CCAR33.

Description

technical field [0001] The invention relates to but not limited to the technical field of engine environment swallowing, in particular to a hail absorption test method of a civil aviation turbofan engine under an open-air test bench. Background technique [0002] During the actual flight, the aircraft will inevitably encounter severe weather in the hail environment. If the aircraft encounters such a harsh environment, its equipped engine will definitely inhale large-sized hailstones or a large number of small-sized hailstones. Large-sized hailstones enter the engine and hit the fan blades, which will affect the structural strength of the blades. Hereinafter, they are referred to as single hailstones. After the continuous small-sized hail enters the engine, it will affect the thermal cycle stability of the engine, cause the engine to work unstable, and even cause accidents such as engine surge and flameout, which will affect the safety of flight, hereinafter referred to as co...

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Problems solved by technology

[0003] The change of the working characteristics of the engine after inhaling hail is extremely complicated. Therefore, it is difficult to show the compliance of its airworthiness clauses only by means of simulation and theoretical analysis. Therefore, it is necessary to test and evaluate the performance

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