Modeling method for non-axisymmetric end wall of axial flow impeller

Abstract

The invention provides a modeling method for a non-axisymmetric end wall of an axial flow impeller, which comprises the following steps: for end wall molded surfaces with different concavities and convexity, firstly, dividing a configuration area, and flexibly constructing various complex end wall structures on the basis of applying fewer variables by adopting a circumferential three-order Fourierseries curve; and then reading a three-order Fourier series curve in the circumferential direction of the blade, enabling spline curves to subjected to smooth connection in the axial direction, and forming a non-axisymmetric end wall model. A three-order Fourier series curve mode is adopted in the circumferential direction to accord with the distribution rule of a blade channel pressure field, the axial section area of a flow channel can be kept almost unchanged, the total loss near the end wall is reduced, flowing separation of airflow is reduced, the outlet flow field and the airflow angleare more uniform, and the performance of a fan and a compressor blade is improved.

Description

technical field [0001] The invention belongs to the technical field of aero-engine design, and in particular relates to a molding method for a non-axisymmetric end wall of an axial-flow impeller, and is especially suitable for modeling the non-axisymmetric end wall of impellers such as fans and compressors. By adopting the circumferential third-order Fourier series curve, various complex end wall structures can be flexibly constructed, and then spline curves are used to connect the third-order Fourier series curves at different axial positions in turn to form non-axisymmetric End wall molding. Background technique [0002] With the rapid development of modern aviation technology, fans and compressors are required to have higher adiabatic efficiency and stall margin. Reducing flow separation and aerodynamic loss of fan and compressor blades is an important means to improve compressor efficiency and stall margin. Among them, the vicinity of the end wall of the fan and compre...

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Problems solved by technology

[0005] In view of the fact that the existing non-axisymmetric end wall modeling methods of axial flow impellers cannot flexibly construct complex end wall structures, and cannot play the role of non-axisymmetric end walls in reducing the aerodynamic loss and flow separation of axial flow impellers such as fans and compressors, the present invention proposes Modeling method of non-axisymmetric end wall of axial flow impeller based on Fourier series curve

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