Determination of the areas of the main operational parameters of a reciprocating hybrid power machine with regenerative heat exchange

Abstract

The thermodynamic and dynamic analysis of working processes and acting forces in single-stage reciprocating compressors and pumps has been performed. It has been established that, despite the general tendency to increase the crankshaft velocity and the discharge pressure of the compressible gas and dropping liquid in reciprocating single-stage compressors and pumps, there are their optimal values, which are determined on the basis of the maximum values of the supply coefficient, indicator, volumetric and total efficiency. It is shown that these values also have limits, bounded by the oil flash point (for reciprocating compressors) and permissible stresses in the parts and assemblies of the drive mechanism (for reciprocating compressors and pumps). It was found out that for a reciprocating hybrid power machine with regenerative heat exchange, the crankshaft velocity could be taken equal to 300...700 rounds per min-1, and the discharge pressure of the compressible gas and dropping liquid is 0.2...1.5 MPa.