Title of Paper:An improved steady inverse method for turbomachinery aerodynamic design

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Date of Publication:2017-05-04

Journal:INVERSE PROBLEMS IN SCIENCE AND ENGINEERING

Included Journals:SCIE、EI

Volume:25

Issue:5

Page Number:633-651

ISSN No.:1741-5977

Key Words:Inverse method; turbomachinery; design; pressure loading; computational fluid dynamics

Abstract:An improved inverse method for turbomachinery design is developed in this paper. A strict 'no-slip' boundary condition is imposed during the flow time marching process, and a virtual movement velocity is computed based on characteristics boundary conditions according to the difference of specified and calculated pressure loading, then the camber line of the blade is moved accordingly. A new 'inverse' time step calculation method is proposed to make the value of the 'inverse' time step case-independent, and a coupled non-uniform rational B-spline (NURBS) smoothing technique is used to improve the robustness of the solver, also guarantee the manufacturability of the obtained blade. Two-dimensional test cases, including compressor and turbine cascades, are adopted to validate the method. Then, the method is extended to three dimensions, and a high-loaded rotor of a fan stage is redesigned by the method in a stage environment. The final results indicate a fairly large performance gain, which demonstrates the effectiveness of the improved method.