Aviation blade profile chord length detection method and system based on secant rotation iteration

Abstract

The invention discloses an aviation blade profile chord length detection method and system based on secant rotation iteration, and belongs to the field of aviation blade profile detection, and the method comprises the steps: taking a connection line between two farthest points in a blade profile contour point set as a secant, rotating or translating the secant to enable the secant to intersect with a blade basin, and obtaining a leading edge point set and a trailing edge point set; rotating the secant in the range of the leading edge point set and the trailing edge point set to obtain tangentpoints of the secant and the leading edge and the trailing edge, and calculating the distance between the two tangent points to obtain the chord length. The chord length calculated through the methodis high in accuracy, the size of the blade can be controlled through the chord length of the blade, meanwhile, if the chord length is too short, the strength of the blade is reduced, the impact resistance and the aerodynamic performance of the blade are affected, and therefore the aerodynamic performance and safety of the blade can be guaranteed when the chord length of the blade is detected through the method.

Description

technical field [0001] The invention belongs to the field of aviation blade profile detection, and more particularly relates to a method and system for detecting the chord length of an aviation blade profile based on secant rotation iteration. Background technique [0002] Aviation blades are the core components of aero-engines. They work under the harsh conditions of high temperature, high pressure and alternating loads for a long time, and their manufacturing accuracy will directly affect the performance of aero-engines. Among them, the chord length is a key parameter of the airfoil shape of the aviation blade, and it is particularly important to calculate it accurately. [0003] When measuring the chord length directly, the efficiency of direct measurement is very low because it is difficult to determine the position of the chord line, it is difficult to ensure that the blade pot side is tangent to the leading edge and the trailing edge, and there are too many parameters ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and system for detecting the chord length of an aviation blade profile based on secant rotation iteration, thereby solving the problem of the large chord length calculation error in the prior art and thus the inability to guarantee Technical Problems of Aerodynamic Performance and Safety of Blades

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