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Mechanistic force analysis of single-screw compressor with 6-11 geometry configuration.

Number: 1580

Author(s) : LIU H., DHUNPUT A., MIYAMURA H., YOUNG T., LAFFORD D., GROLL E. A., ZIVIANI D.

Summary

In commercial and industrial Heating, Ventilating, Air Conditioning & Refrigeration (HVAC&R) applications, single-screw compressors have been widely used and proven to be efficient, reliable and economical in various operating conditions and capacity ranges. The efficiency of single-screw compressor depends on several factors, including the pressure ratio, volume ratio, and leakage flows as well as frictional, heat and mechanical losses. Thus, estimating forces and moments play an important role with respect to reducing mechanical losses. It is also critical to the reliability and safe operation of the machine. In this paper, a detailed mechanistic model of a 6-11 configuration single-screw compressor is described. The model is used to investigate the impact of design changes on compressor performance. The governing equations of conservation of mass and energy across the multi chambers of the compressor as well as the overall energy balance is developed to solve the thermodynamic model to capture the pressure and volume variation at different crank angles. The energy efficiency, mass flow rate and other compressor performance indices are also calculated. The simulation results are validated using experimental data obtained with a 6-11 screw compressor with R134a as the working fluid under several different operating conditions. The mechanistic model is achieved by implementation force and momentum balances on both the main rotor and starwheels to analyze the bearing forces, friction forces and rotor forces. The mechanistic model is integrated with the thermodynamic model and implemented in the Python programming language in the open source simulation package PDSim.

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Pages: 12

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Details

  • Original title: Mechanistic force analysis of single-screw compressor with 6-11 geometry configuration.
  • Record ID : 30028393
  • Languages: English
  • Subject: Technology
  • Source: 2021 Purdue Conferences. 25th International Compressor Engineering Conference at Purdue.
  • Publication date: 2021/05
  • Document available for consultation in the library of the IIR headquarters only.

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