Experimental Study of the Influence of the Crankshaft Rotational Speed on the Working Processes of a Piston-Type Positive Displacement Hybrid Power Machine with Two Suction Valves

Experimental studies of the heat stress of the parts of the cylinder-piston group, the flow rate of the coolant, and the feed rate of a piston-type hybrid power machine with two suction valves were performed with a change in the crankshaft rotational speed and the discharge pressure of compressible gas. The analysis established the general patterns of change in these response functions depending on the crankshaft rotational speed. The highest coolant flow rate, and therefore, the best cooling of gas and parts of the cylinder-piston group of the compressor, is achieved at a crankshaft rotational speed of 1,200 min-1. The nature of the dependence of the feed rate on the rotational speed is affected by the discharge pressure. At a discharge pressure (p) of 0.4 MPa, the maximum value of the feed rate ranges from 1,100 min-1 to 1,300 min-1.