This paper deals with description of the real mixture of moist air and lubricant (at elevated pressure and temperatures) which outflow from a positive displacement compressor and the main point of this paper is to describe thermodynamic formulas for calculations. Compressed air is very important medium used in industry (e. g. shops, pneumatics, transport, pharmaceutical industry, etc.). It is obtained during air compression mainly in a positive displacement compressor. The cylinder - piston assembly, the reciprocating movement and friction of piston give the main characteristic of such compressors. To reduce the friction lubricant is used. Until now in thermodynamic models and calculations air is not considered mixture with lubricant but as an ideal pure gas. In this paper authors describe mixture consisting of moist air and lubricant by means of differential equations mass conservation law, momentum conservation and energy conservation law.
展开▼
