Operation and performance of screw machines with high built-in volume ratio

International Conference on Compressors and their Systems 2019

Stosic, N.^1

University of London, Northampton Sq, London

EC1V 0HB, United Kingdom^1

关键词: Adiabatic efficiency;    Discharge port;    High pressure ratio;    Its efficiencies;    Machine operation;    Performance calculation;    Screw compressors;    Screw machines;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/604/1/012014/pdf
DOI  :  10.1088/1757-899X/604/1/012014

来源: IOP

【 摘 要 】

A performance calculation of a screw compressor with increased built-in volume ratio was performed in this paper to establish how increased built-in volume ratio influences its efficiency. It is known that screw compressors have limited built-in ratio which is determined by their standard discharge port size and position. However, if the discharge port is reduced beyond its cusp position, the screw machine built-in volume is increased. In such a case, influence of the oil volume in the air-oil mixture of oil-flooded compressors increases the machine built-in volume further. The performance improvement achieved if the built-in volume ratio is doubled in comparison with the standard port during the machine operation at high pressure ratio of more than 20, is up to 26% for the specific power and adiabatic efficiency. This confirms superiority of the reduced size high pressure port for compressors which operate at high pressure ratio.