In order to bring the gas compression process closer to isothermal in a single-cylinder piston hybrid power machine, a new piston design is proposed. The design comprises a rigid mechanical piston (whose speed is determined by the drive mechanism) and a liquid piston (whose speed is determined by the flow of liquid through the channel in the piston into the pump cavity). A method is developed for determining the decrease in the height of the liquid piston (the speed of the liquid piston) by the angle of rotation of the crankshaft to permit an isothermal compression process. A numerical experiment was carried out to establish the influence of the ratio of the initial liquid level to the full stroke (Sw0/Sh) on the value of the final pressure during isothermal compression and the diameter of the channel made in the piston. It is shown that, with a ratio of Sw0/Sh = 0.1, the most rational value provides a degree of pressure increase in the cylinder equal to 2, while the hole diameter should be 17% of the piston diameter.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 57, No. 10, pp. 23–27, October, 2021.
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Shcherba, V.E. Improving the Efficiency of the Compression Process in a Positive Displacement Hybrid Reciprocating Power Machine. Chem Petrol Eng 57, 847–854 (2022). https://doi.org/10.1007/s10556-022-01016-0
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DOI: https://doi.org/10.1007/s10556-022-01016-0