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CFD numerical analysis of influence factors of seal rotordynamic characteristics

SUN Dan;WANG Shuang;AI Yan-ting;WANG Ke-ming;HU Guang-yang;LIU Ning-ning;Faculty of Aerospace Engineering,Shenyang Aerospace University;Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System;The 5thResearch Department,AVIC Shenyang Engine Design and Research Institute;  
The Moving Reference Frame technology was studied in the paper by transforming unsteady flowinto steady one using Moving Reference Frame method. The rotordynamic characteristics of labyrinth seal models were set up to evaluate the seal rotordynamic characteristics and flowfield characteristics. The seal rotordynamic characteristics and whirl coefficients under different pressure ratios,rotational speeds,and prerotation conditions were evaluated to study the influence factors of seal rotordynamic characteristics,and the influence factors of exciting force produced by seal air flowwere further analyzed on the basis of numerical calculations. The results,which are unfavorable for the stability of the rotor,showthat with the increase of the inlet pressure and rotational speed,the cross stiffness coefficient k increases,the direct damping C decreases,and the whirl coefficient increases,and the seal fluid circumferential flowis the main cause of the seal airflowexciting force.
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