Real thrust measuring and calculating method for test run of aero-engine on indoor test bed

Abstract

The invention belongs to the technical field of aero-engines and particularly relates to a real thrust measuring and calculating method for test run of an aero-engine on an indoor test bed. The real thrust measuring and calculating method specifically comprises the steps of 1 determining the spatial position of a control body, 2 arranging a rear cross section measuring point on a lip rear cross section (2), 3 arranging front cross section measuring point on a far front cross section (1), 4 obtaining wind speed values and static pressure values on the measuring points, and 5 obtaining a real thrust value of the test run of the aero-engine on the indoor test bed. According to the real thrust measuring and calculating method, the area of air intake cross section of the engine is reasonably selected, the flow pipe surface for air flowing in a test run workshop serves as a control face, an air intake channel additional resistance correction formula is derived and real thrust is calculated by applying momentum theorem. The real thrust measuring and calculating method has the advantages of being clear in control body division, fewer in correction terms, simple and convenient to calculate and the like, and the problem of real thrust measurement and calculation during the test run of the aero-engine on the indoor test bed can be solved.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a method for measuring and calculating real thrust of an aero-engine on an indoor test bench. Background technique [0002] When an aero-engine is tested on an indoor test bench, there is air flow around the engine, and the air flow acts on the engine to generate resistance opposite to the thrust. It is precisely because of the existence of these resistances that the aeroengine thrust measured on the indoor test bench must be corrected by aerodynamic additional resistance to obtain the true thrust value. [0003] At present, the real thrust calculation of aero-engines on indoor test benches is mainly obtained through cross-testing methods on open-air platforms and indoor test benches. For a long time, my country lacks an open-air benchmark test bench for calibrating engine standard parts, which can only be purchased from abroad, so the cost of cross-testing is r...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of calculating the real thrust of the aero-engine through the correction of the aerodynamic additional resistance of the indoor test bench is that: due to the inaccurate test of the flow field distribution, the flow calculation error is relatively large, resulting in the actual thrust value of the aero-engine on the indoor test bench. big error

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