Study on aerodynamic performance in turbomachines based on fluid-structure coupling method

Abstract

With the development of the modern turbomachinery design technology, the effects of fluid-structure coupling on aerodynamic performance and structural dynamic characteristics cannot be ignored. Therefore, the structural dynamic characteristics and aerodynamic performance is numerically simulated and studied by using the computational fluid dynamics and computational structural dynamics methods in present work. The aerodynamic data and deformation displacement data are transferred between CFD and CSD by linear interpolation and Constant-Volume Tetrahedron transformation respectively. Through comparing the aerodynamic force contour and displacement contour level on aerodynamic grids and structural grids, the data transfer approach is verified. Then, the fluid-structure coupling characteristics in a fan rotor are analyzed. The results show that, the stress, deformation displacement is affected by fluid-structure interaction, but vibration frequency is changed slightly under the action of aerodynamic force; the mass flow, total pressure ratio and adiabatic efficiency at design rotation speed are affected by fluid-structure interaction remarkably. More interesting, the choking flow rate of coupling computation is greater than that obtained by uncoupled analysis, but it will be slightly decrease with the total pressure ratio decreasing. Moreover, as the rotate speed decreasing, the coupling effect on mass flow, total pressure ratio and adiabatic efficiency are reduced.