Method for calibrating pushing force of trial run table inside engine room

Abstract

A method for calibrating pushing force of trial run table inside an engine room belongs to the technical field of aviation engines, and includes the following steps of: drawing a maximum state theoretic pushing force index tolerance zone and a full stress application state theoretic pushing force index tolerance zone at the corresponding atmospheric temperature respectively; calculating the maximum state theoretic pushing force value and the full stress application state theoretic pushing force value at the corresponding atmospheric temperature respectively through the maximum state pushing force reduction coefficient and the stress application state pushing force reduction coefficient; drawing a maximum state theoretic pushing force tolerance curve and a full stress application state theoretic pushing force tolerance curve as per the maximum state pushing force limit value tolerance and the full stress application state pushing force limit value tolerance; drawing pushing force measure values of the trial run table into the maximum state theoretic pushing force tolerance curve and the full stress application state theoretic pushing force tolerance curve respectively as per the inlet temperature of the engine, and further obtaining the variation curve of the maximum state measurement pushing force along the atmospheric temperature and the variation curve of the full stress application state measurement pushing force along the atmospheric temperature of the rack engine; and multiplying the pushing force measure values of the trial run table by the same coefficient simultaneously, enabling more than 90% measurement points to fall in the tolerance zones and enabling all the pushing force measurement points to conform to normal distribution. At the moment, the coefficient is the pushing force correction factor.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular to a method for calibrating the thrust of a test bench in an engine room. This method is mainly used in the thrust calibration technology of the military aero-engine indoor test bench. Background technique [0002] According to the requirements of our country's military standard, various types of test benches for scientific research and production must be calibrated regularly through the calibration engine to determine the correction value or correction coefficient of the test bench. For a long time, there has been a lack of open-air benchmark test benches used to form engine standard parts for calibration of indoor test benches in China, resulting in a situation where the calibration of domestic military aero-engine indoor test benches has been regulated and difficult to implement. [0003] Most of the test benches in China use the calibration engine transfer method for test ...

AI Technical Summary

Problems solved by technology

For a long time, there has been a lack of open-air benchmark test benches used to form engine standard parts for calibration of indoor test benches in China, resulting in the calibration of domestic military aero-engine indoor test benches being regulated and difficult to implement.

[0003] Most of the test benches in China use the calibration engine transfer method for test bench calibration, but most of the calibration engines are produced by foreign test benches. The first calibration engine has obvious performance instability many times during use. The test bench often has the situation that the thrust correction coefficient "fluctuates up and down". In addition, the performance of the calibration engine will gradually decay after repeated use, resulting in the calibration engine being unable to perform bench calibration.

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