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research-article

NUMERICAL INVESTIGATION ON THE LEAKAGE AND ROTORDYNAMIC CHARACTERISTICS FOR THREE TYPES OF ANNULAR GAS SEALS IN WET GAS CONDITIONS

[+] Author and Article Information
Zhigang LI

Institute of Turbomachinery, School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
zhigangli@mail.xjtu.edu.cn

Zhi FANG

Institute of Turbomachinery, School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
fangzhi566@stu.xjtu.edu.cn

Jun LI

Institute of Turbomachinery, School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
junli@mail.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041313 History: Received July 31, 2018; Revised August 16, 2018

Abstract

In order to better understand the leakage and rotordynamic characteristics of the annular gas seal in wet gas conditions, a 3D transient CFD-based perturbation method was proposed for computations of leakage flow rates and rotordynamic force coefficients of annular gas seals with liquid phase in main gas phase, based on inhomogeneous Eulerian-Eulerian multiphase flow model, mesh deformation technique and the multi-frequency rotor whirling orbit model. Numerical results of frequency-dependent rotordynamic force coefficients and leakage flow rates were presented and compared for three types of non-contact annular gas seals, which include a smooth plain annular seal (SPAS), a labyrinth seal (LABY) and a fully-partitioned pocket damper seal (FPDS). These three seals were designed to have the identical rotor diameter, sealing clearance and axial length. The accuracy and availability of the present transient CFD numerical method were demonstrated with the experiment data of leakage flow rates and frequency-dependent rotordynamic force coefficients of the smooth plain seal with four inlet liquid volume fractions (LVF) of 0%, 2%, 5% and 8%. Steady and transient numerical simulations were conducted at inlet air pressure of 62.1 bar, pressure ratio of 0.5, rotational speed of 15 000 rpm and inlet preswirl ratio of 0.3 for four inlet LVFs varying from 0% to 8% and fourteen subsynchronous and synchronous whirling frequencies up to 280 Hz.

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