A method for testing and evaluating surface quality of an internal flow channel based on pressure loss

Abstract

A kind of test and evaluation method of internal flow channel surface quality based on pressure loss, different roughness, corner standard internal flow channel sample is manufactured using the way of additive manufacturing;Then the design and manufacture of internal flow channel surface quality evaluation device are carried out;Again, the coefficient calibration of modified head loss formula is carried out;In the evaluation device, the error equation coefficient between the theoretical head loss value and the experimental head loss value is calibrated using the standard internal flow channel roughness sample with different roughness;The local resistance coefficient in the modified head loss formula is calibrated using the standard internal flow channel corner sample with different corners;Finally, the internal flow channel surface quality test and evaluation of complex parts are carried out;The present application fully considers the influence of roughness in head loss formula and the subsequent use of parts, can realize the nondestructive testing of internal flow channel surface quality of complex parts, is conducive to guarantee the machining quality of internal flow channel of complex parts and perfect internal flow channel surface quality evaluation system.

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