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Session: Poster session
Session starts: Tuesday 13 October, 13:30

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Guoqiang Li ()
Yuting Wu ()
Ruiping Zhi ()
Yeqiang Zhang ()
Chongfang Ma ()

Abstract:
Single-screw expander can be used in small scale ORC power system in which the output power is from 1 to 500 kW. There are many advantages of single screw expander, such as long working life, balanced loading of the screw, high volumetric efficiency, low noise, low leakage, low vibration and simple configuration. However, reliable seal is required at the high-pressure side of the screw for single screw expander. Labyrinth seal is a widely used seal method in the scope of industry. It is characterized by simple structure, well-adapted, great stabilization, long lifetime and convenient maintenance. It is widely used to seal compressors, steam turbines, gas turbines and blowing plants. Therefore it is very promising that single screw expander adopts labyrinth seal to get well sealing at high-pressure side of the screw. In this paper, several models were built, and then numerical simulation was conducted. Sequentially, the operating principles of labyrinth seal were analysed according to the simulation results. In addition, the influences of the labyrinth seal parameters, such as types of organic working fluids, pressures at inlet and outlet, size of clearance (length & width), tooth width, tooth height, tooth distance, number of teeth, and angle of inclination, were studied.