Session: 31-08 Compressor Prediction Methodology

Paper Number: 125677

125677 - An Efficient and Robust Rotor-Stator Interfacing Method Capable of Handling Reverse Flows and Variable Specific Heat Within Multistage Turbomachines 

This paper presents the study of an efficient, robust, conservative and nonreflective rotor-stator interfacing method for steady aerodynamic analysis of multistage turbomachines. This novel rotor-stator method first makes use of the arithmetic average of the circumferential area-averaged flow variables at both upstream and downstream of an interrow interface to compute the coefficient matrix. Then the flow variable difference is computed according to the flux difference and the computed coefficient matrix. To avoid numerical reflection, the one-dimensional nonreflective boundary condition is used for data exchange at the bladerow interface. To showcase the advantage of the newly developed method over the mixing plane method proposed by Giles, two multistage test cases including the NASA Stage 35 with reverse flow at the casing and the E3 high-pressure turbine operating are adopted. The turbine case necessitates the use of variable specific heat due to the big variation of temperature in the flow field. The results show that the proposed method is robust and capable of handling reverse flow while the Giles’ method suffers from numerical instability. Furthermore, the new method presents a unified approach for both constant and variable specific heats. It is more efficient than the Giles’ method especially for ideal gas of variable specific heat, since there is no need to use the Newton-Raphson method to compute the mixed-out flow variables from the circumferential area-averaged flux.

Presenting Author: Hangkong Wu School of Power and Energy, Northwestern Polytechnical University

Presenting Author Biography: I am a PhD student in Northwestern Polytechnical University. I major in Turbomachinery aerodynamic analysis, design optimization using the adjoint method, and aeroelastic analysis.

Authors:

Hangkong Wu School of Power and Energy, Northwestern Polytechnical University
Xiaopei Tian Aeroengine Academy of China
Hao Qin School of Power and Energy, Northwestern Polytechnical University
Xiuquan Huang School of Power and Energy, Northwestern Polytechnical University
Dingxi Wang School of Power and Energy, Northwestern Polytechnical University