Numerical Investigations on the Leakage Flow and Rotordynamic Characteristics of Labyrinth Seal
Rotordynamic coefficients and leakage flow characteristics of the experimental labyrinth seal were numerically predicted using the multi-frequency, elliptical whirling orbit model and transient threedimensional Reynolds-Averaged Navier-Stokes (RANS) solutions. By conducting the multi-frequency, periodic elliptical whirling orbit for rotor center as the excitation signal, the transient RANS solutions combined with mesh deformation method were utilized to calculate the transient response forces (correlating with the assigned rotor periodic motion) on the labyrinth seal rotor surface. The frequencydependent rotordynamic coefficients of the labyrinth seal were determined by transforming the dynamic monitoring data of response forces and rotor motions to the frequency domain using the Fast Fourier Transform (FFT). Numerical computations were conducted at three pressure ratios of 0. 14, 0. 29 and 0. 45, three rotational speeds of 7,000, 15,000, and 20,000r/min and thirteen frequencies 20-260Hz. The obtained numerical results of rotordynamic coefficients of the labyrinth seal are found to be in good agreement with the experimental data. The accuracy and availability of the proposed numerical method was demonstrated. The effects of pressure ratio, rotational speed, and vibration frequency on the rotordynamic coefficients and leakage flow rates of the experimental labyrinth seal were investigated. The labyrinth seal possesses negative and frequencydependent direct stiffness coefficients, and positive and frequency-independent direct damping coefficients. Compared to the pressure ratio, the rotational speed has more significant influence on the rotordynamic coefficients of the labyrinth seal, especially for the cross-coupling stiffness and damping coefficients.
Labyrinth Seal Leakage Flow Rotordynamics Numerical Simulation
LI Zhi-gang LI Jun FENG Zheit-ping
Institute of Turbomachinery, Xian Jiaotong University, Xian, China
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
36-45
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）