Leakage clearance plays an important role in guaranteeing high efficiency of scroll compressors. In view
of the shortcomings of the existing leakage models of axial clearance of scroll compressors, a modified Fano flow
model and a turbulence model are presented based on the flow characteristics of fluid in the leakage passage under
actual working conditions. Firstly, according to the Fano flow energy equation and the turbulence theory, two kinds
of leakage models, Fano flow model and turbulence model, of axial clearance are established. Then, the established
models are verified through an experimental platform established to measure the axial clearance leakage in the
working process of a scroll compressor, and the measured values are compared with the values obtained from the
two theoretical models. Finally, the effect of such factors as pressure difference, clearance amount, spindle speed
on the axial clearance leakage is analyzed. Results show that the two established models can precisely reflect the
variation law of axial clearance leakage of scroll compressor under different working conditions. In particular, the
Fano flow model is more suitable for predicting the clearance leakage when the spindle speed is low (less than
3 500 r/min) and the clearance is small (less than 0.025 mm), whereas the turbulence model is suitable for high
spindle speed (more than 3 500 r/min) and large clearance (more than 0.025 mm).
WANG Jianji, LIU Tao
. Leakage Model of Axial Clearance and Test of Scroll Compressors[J]. Journal of Shanghai Jiaotong University(Science), 2020
, 25(4)
: 531
-537
.
DOI: 10.1007/s12204-020-2163-6
[1] ISHII N, BIRD K, SANO K, et al. Refrigerant leakage flow evaluation for scroll compressors[C]//International Compressor Engineering Conference.West Lafayette, IN, USA: Purdue e-Pubs, 1996:633-638.
[2] YOUN Y, KIM Y, MIN M. Characteristics of flank and tip seal leakage in a scroll compressor for airconditioners[J]. Korean Journal of Air-Conditioning and Refrigeration Engineering, 2001, 13(2): 134-143(in Korean).
[3] BELL I H, GROLL E A, BRAUN J E, et al. A computationally efficient hybrid leakage model for positive displacement compressors and expanders [J]. International Journal of Refrigeration, 2013, 36(7): 1965-1973.
[4] LIU X W, TIAN Y H, LIU Z Q, et al. Investigation on the leak under the state of laminar flow in axial via of scroll compressor [J]. Fluid Machinery, 2004, 32(7):9-11 (in Chinese).
[5] LIU XW, ZHAO M, LI C, et al. Research on the radial labyrinth of scroll compressor [J]. Journal of Mechanical Engineering, 2012, 48(21): 97-104 (in Chinese).
[6] LIU X W, ZHANG G Z, LI C, et al. Research on gas leakage pneumatic thermodynamic behavior in the radial labyrinth of scroll compressor [J]. Journal of Mechanical Engineering, 2015, 51(20): 201-207 (in Chinese).
[7] ZHA H B, SONG Y X WANG J, et al. A gas leakage model in the leakage clearance of scroll compressor [J].Journal of Engineering Thermophysics, 2016, 37(7):1438-1443 (in Chinese).
[8] WU K. Analysis of the internal flow mechanism and leakage flow characteristic of a scroll refrigeration compressor[D]. Xi’an, China: Xi’an University of Technology,2018 (in Chinese).
[9] LI C, XIE W J, ZHAO M. Finite element analysis of the influence of different loads and structures on the stress of the scroll wrap [J]. Journal of Mechanical Engineering,2015, 51(6): 189-197.
[10] HOU C S, LIU T. Law governing the change in the thickness of a variable cross-section scroll tooth based on Frenet frame [J]. Journal of Harbin Engineering University, 2019, 40(6): 1169-1174 (in Chinese).
[11] LI L S. Scroll compressor [M]. Beijing, China: Machinery Industry Press, 1997: 27-42 (in Chinese).
[12] CHEN R, WANG W. Discussion on leaking characters in meso-scroll compressor [J]. International Journal of Refrigeration, 2009, 32: 1433-1441.
[13] TAO L, CHEN J H. Analysis of the leakage of the clearance seal in the regenerator of Stirling refrigerator[J]. Cryogenics and Superconductivity, 2010, 38(7): 26-28.
