Abstract: As a major component of an electric scroll compressor, the performance of the oil-gas separator is an important factor affecting the volumetric and isentropic efficiency of the compressor. This paper analyzes the flow characteristics, separation efficiency and pressure loss of the oil-gas separator at different structural parameters and operating conditions by numerical calculation and experimental study. Numerical calculation result shows that the fluid flow inside the oil-gas separator consists of two fluid regions: the downward external rotating flow and the upward internal rotating flow. With the increase of the compressor speed, the separation efficiency of the oil fraction is increased, but the pressure loss is also increased. When the compressor speed is lower than 5 000 r/min, the separation efficiency is decreased by increasing the inlet geometry angle of the oil fraction, in this case, the overall performance of the separator is optimized at an inlet angle of $ 0^{\circ} $. When the compressor speed is higher than 5 000 r/min, the pressure loss of the oil fraction is decreased by increasing the inlet geometry angle of the oil fraction, in this case, the overall performance of the separator is optimized at an inlet angle of $ 10^{\circ} $. The experimental result also shows that the oil separation efficiency is increased with an increase in the compressor speed.
Keywords: scroll compressor; oil-gas separator; inlet geometry angle; flow field analysis; separation efficiency; pressure loss
合肥工业大学学报自科版