Method for preliminary estimation of the crankshaft rotational speed of a reciprocating hybrid power machine with regenerative heat exchange when operating in compressor and pump modes

Abstract

The determination of the crankshaft rotational speed of a reciprocating hybrid power machine with regenerative heat exchange when operating in the pump mode at a known angular velocity of the crankshaft and when operating in the compressor mode is considered. Based on the analysis of the working processes of injection and suction and assuming equal maximum pressure losses in these processes, the analytical expressions for determining the angular velocity of the crankshaft when operating in the pump mode with a known angular velocity of the crankshaft when operating in the compressor mode are obtained. In addition, based on the equality of work losses in the processes of injection and suction when operating in the compressor and pump modes, the angular velocity of the crankshaft in the pump mode is determined with a known angular velocity of the crankshaft when operating in the compressor mode. Based on the numerical analysis for the air-water working bodies, the dependences of the rotational speed of the crankshaft when operating in the pump mode on the rotational speed of the crankshaft when operating in the compressor mode and on the discharge pressure were obtained. It is shown that the rotational speed of the crankshaft is 100150 min–1 at the rotational speed of the crankshaft in the compressor mode from 2000 to 3000 min–1. Keywords: reciprocating hybrid power machine, regenerative heat exchange, reciprocating compressor, reciprocating pump, crankshaft rotational speed, discharge pressure. Scherba_V_E@list.ru