Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (12): 2778-2787.doi: 10.13229/j.cnki.jdxbgxb20210465

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Internal thermodynamic characteristics and performance test of new oil⁃free scroll compressor

Jian SUN(),Bin PENG(),Bing-guo ZHU   

  1. School of Electrical and Mechanical Engineering,Lanzhou University of Technology,Lanzhou 730050,China
  • Received:2021-05-24 Online:2022-12-01 Published:2022-12-08
  • Contact: Bin PENG E-mail:lutpb_sj_2016@163.com;pengb2000@163.com

Abstract:

A thermodynamic model for the scroll compressor's working process is developed based on the thermodynamics of the variable mass system and the control volume method. The unsteady numerical simulation of the compressor's internal flow field was performed using the CFD (Computational Fluid Dynamics) method. The temperature, pressure, velocity, and mass flow of the fluid in the working chamber change were obtained. The test platform is built to test the inlet and outlet volume flow, discharge temperature, driving motor temperature and body vibration value of the prototype change trend. The results show that the thermodynamic model of leakage and heat transfer is more in line with the actual working process of scroll compressor. Because of the mass exchange between adjacent working chambers, the temperature and velocity distribution in the working chamber will be uneven. Under scroll compressor different discharge pressures, the maximum difference between the inlet and outlet volume flow of the scroll compressor is 0.15 m3/min, and the maximum temperature difference between the discharge temperature of the scroll compressor is 19 ℃.

Key words: scroll compressor, thermodynamic model, internal leakage and heat transfer, computational fluid dynamics, numerical simulation

CLC Number: 

  • TH455

Table 1

Geometric parameters of scroll compressor"

参数数值
基圆半径rb/mm3.676
渐开线发生角α/rad0.680
偏心距ror/mm7.150
涡旋齿齿高h/mm25.000
渐开线终端展角φe/rad26.627

Fig.1

Scroll profile and fixed scroll"

Fig.2

Schematic diagram of fluid domain grid"

Fig.3

Verification of grid independence"

Table 2

Number of meshes in fluid domain"

流体域名称总单元数总结点数
总计3 079 8291 380 590
进气管16 74414 525
工作腔3 049 5611 350 640
排气管13 52415 425

Fig.4

Working chamber volume change with different spindle angle"

Fig.5

Pressure and temperature change with different spindle angle"

Fig.6

Mass change with different spindle angle"

Fig.7

Gas force and moment change with different spindle angle"

Fig.8

Mass flow and velocity of inlet and outlet change with different spindle angle"

Fig.9

Working chamber contour distribution"

Fig.10

Experimental test system"

Fig.11

Volume flow change with exhaust pressure and rotate speed"

Fig.12

Volumetric efficiency"

Fig.13

Discharge and motor temperature change with pressure"

Fig.14

Vibration value of each part of scroll compressor with different exhaust pressure"

Fig.15

Drive motor current and power change with exhaust pressure"

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