Threedimensional inverse design and fluid flow numerical simulation for centrifugal impeller
YANG Wei, WANG Fu-Jun, WANG Hong
(1.College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)
In order to solve the problems of traditional design methods, which are mainly rely on experience of a designer and the design cycle is often too long, a threedimensional (3D) inverse design method was used to design the impeller according to given flow field conditions. The method has a better control ability of design outcomes during the design procedure. Based on the inviscid and potential flow assumption, a 3D velocity field in centrifugal impeller is decomposed into an averaged circumferential flow and a periodic one; subsequently they are solved numerically in the twodimensional meridional plane and the bladetoblade surface to approximately obtain the 3D fluid flow field. 3D geometry of a blade is established according to the slip boundary condition on the surface of the blade, the flow field in the designed impeller is obtainable simultaneously as well. A centrifugal impeller was designed by a 3D inverse design code developed by the authors, also a 3D steady, turbulent fluid flow in the impeller was simulated by using a CFD code to examine the flow field and evaluate the impeller performance. The viscous fluid flow simulated and inviscid one obtained in the design are in qualitative agreement, confirming the validity of the 3D inverse design method. The results indicate that combination of the inverse design method and the turbulent flow simulation technique can shorten design cycle and improve design quality effectively. This design strategy may be applicable to impeller design of the rest type of fluid machine.
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