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The Simulation and Optimum Design of Rolling Rotor Compressor with Propane

Author: LiuQiang
Tutor: HeGuoGeng
School: Huazhong University of Science and Technology
Course: Refrigeration and Cryogenic Engineering
Keywords: Propane Rotary Compressor Radial clearance Skateboard side clearance Leak Two-phase flow
CLC: TH45
Type: Master's thesis
Year: 2009
Downloads: 130
Quote: 1
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Abstract


Propane (R290) air conditioning refrigerant R22 is a very good natural alternative , smaller than R22 CHARGE , higher energy efficiency and better economics . Propane as an excellent refrigerant working fluids , is ideal for the small air-conditioned with fully enclosed rolling rotor compressor . For the use of the new refrigerant R290 compressor system , we need to optimize the design of the system based on the R290 nature , mainly to improve the compression method to reduce the volume loss , reduce the pressure loss , reduce temperature loss and reduce leakage losses in the compressor side the volumetric efficiency of the machine . Mainly through the method to reduce the volume loss and leakage losses study , optimizing the structure of the refrigerant R290 is used to do the rolling rotor compressor , and its suitable leakage gap size and suitable viscosity of the lubricant is selected . The volumetric efficiency of the compressor leakage losses , the same compressor , gap size and the use of different oil leakage losses . The text of the study focused on the the cylinder leakage losses . FLUENT simulation radial clearance and the slide plate on both sides of surface gap R290 refrigerant vapor leakage , respectively, using the rotating wall surface model and the static wall model gas two - phase when considering the gap flow is also used in FLUENT VOF Breakup model. For the model under the two different models , analysis of the difference between the velocity of the fluid , pressure, temperature and density distribution . The leakage losses , including the size of the gap size , lubricating oil viscosity, etc. in the compressor clearance leakage will affect . By comparative analysis of simulation results , selected No. 46 mineral oil as R290 Rotary Compressor system suitable lubricants and control the radial clearance of less than 25μm , skateboard sides in less than 35μm gap control , makes the gas leak controlled at 5% or less of the mass flow of the compressor . Using the higher viscosity of the lubricant , and so that the radial gap and the slide plate surface gap on both sides of the further smaller size also makes the leakage amount becomes small .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Gas compression and transportation machinery > Compressors, compressor
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