Abstract
For a water-injected single-screw vapor compressor (SSVC), leakage is an important issue that affects the compressor performance. However, the leakage mechanism of an SSVC with a multicolumn envelope meshing pair (MEMP) is unclear. In this paper, leakage characteristic mathematical models of an SSVC with MEMP are established and solved, including the orifice plate model, parallel plate model covered by a water-vapor two-phase film and Laval nozzle model considering the flash evaporation process. The calculation results are compared and verified by experimental data, and the error of the exhaust temperature and leakage coefficient is within 5%. Based on the verified mathematical model, the leakage characteristics of an SSVC with MEMP and the influence of the operating parameters and structural parameters on them are analyzed and discussed. Of all leakage channels, only the path between the front side of the screw groove and wall is inward leaking. The leakage of the plate channel is mainly water, while the Laval nozzle and orifice plate channels are mainly two-phase. The volumetric efficiency of SSVC can be increased by 6.5% and 2.65% by reducing the rotational speed and evaporation pressure by 50%, respectively. This study can provide a theoretical basis for the compressor performance analysis.
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