Abstract
The effect of liquid compressibility in the two-stage piston hybrid positive-displacement machine with a liquid piston was considered. Based on the volume conservation equation, we developed a calculus methodology for the liquid compressibility during gas compression in the second stage of the compressor section. A numerical experiment made it possible to establish that some parameters have the greatest effect on the relative decrease in the height and velocity of the liquid layer. These parameters are the degree of pressure ratio; pipeline length; the polytropic index of the compression; the number of crankshaft revolutions. We found that the relative decrease in the liquid layer height is within 1 %, and the relative decrease in the liquid piston velocity is within 5 %. The paper analyses the liquid piston compressibility influence on the thermodynamic efficiency of the compression process and compressor performance.
Highlights
One of the cardinal ways to improve the efficiency and weight-size parameters of compressors and positive-displacement pumps is to combine them into a single unit
We calculate the liquid compressibility during compression of the two-stage piston hybrid positive-displacement machine with the following initial parameters:
We have developed a methodology for calculating liquid compressibility in the working processes of the two-stage piston hybrid positive-displacement machine
Summary
One of the cardinal ways to improve the efficiency and weight-size parameters of compressors and positive-displacement pumps is to combine them into a single unit. Improving the compressed gas cooling and eliminating compressed gas leakage in the cylinder-piston seal leads to an increase in indicator efficiency [8]. The elimination of dead space in the compressor and gas leakage in the cylinder-piston seal leads to an increase in the compressor delivery rate. The liquid is supplied to compress gas from the first stage of the pump section to the second stage of the compressor section through the connecting pipe. The operation of such a unit is possible due to the fact that the supply of gas and liquid passes in anti-phase in the first stage of the hybrid machine
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