A Method for Determining the Limit Value of Air Flow Test Standard Parts

Abstract

The invention provides an air flow test standard component limit value determination method, which comprises the following steps: 1) testing a flow value of a standard component through an air flow test stand, the precision grade of which is higher than that of a used air flow test stand, and serving the test value as a flow true value b of the standard component; 2) according to the flow limit value of the standard component, calculating flow tolerance w of the standard component; 3) carrying out air flow value test for many times on the standard component on the used air flow test stand, and serving the tested air flow values as samples and calculating an average value a and a sample standard error s; and 4) according to the flow true value b of the standard component, the flow tolerance w of the standard component, the average value a and the sample standard error s of the standard component, calculating the limit value of the standard component. Finally, by judging whether the flow value obtained when the standard component is tested on the air flow test stand is between the upper limit value and the lower limit value of the standard component, comprehensive state of the flow test stand can be judged.

Description

technical field [0001] The invention belongs to the testing technology of an aero-engine, and in particular relates to a method for determining the limit value of an air flow test standard part. Background technique [0002] The air flow test of aero-engine parts is a complicated process, and there are many links that affect the test accuracy, such as whether there is leakage on the test bench and test tooling, whether the instruments and meters are in normal working condition, etc. If there are problems in these links, all will affect the accuracy of the test. During the air flow test of engine parts, before the formal parts test, the standard parts must be tested first, and the comprehensive state of the flow test bench should be judged according to the test results. [0003] Standard parts are only used as a single-point calibration reference for part tooling. Its role is to monitor the part air flow test system during production to ensure that its performance is within ...

AI Technical Summary

Problems solved by technology

Since the existing technology uses the correction coefficient given by the test bench to ensure that the standard flow value of the standard part meets the requirements, the comparative test method is adopted, which relies too much on the flow value of the standard part, and cannot fully reflect the flow value of the test part.

Images