Chemical and Petroleum Engineering, Vol. 54, Nos. 1–2, May, 2018 (Russian Original Nos. 1–2, Jan.–Feb., 2018)
Omsk State Technical University, Omsk, Russia; e-mail: Scherba_V_E@list.ru, email@example.com. Translated from Khimicheskoe i Nefte-
gazovoe Mashinostroenie, No. 2, pp. 22–26, February, 2018.
COMPRESSORS, PUMPS, AND PIPELINE FITTINGS
ANALYSIS OF THE EFFECT OF THE RATIO OF DISCHARGE
PRESSURE TO SUCTION PRESSURE ON THE CHARACTERISTICS
OF A PISTON HYBRID POWER MACHINE WITH GAS
V. E. Shcherba, V. S. Shcherbakov, N. S. Galdin, UDC 621.512
A. V. Grigor’ev, and D. A. Trukhanova
The principle of operation of a piston hybrid power machine with gas suction capacity is described. Results
of a numerical investigation and analysis of the inﬂ uence of the ratio of discharge pressure to suction
pressure on the characteristics of the studied machine are given.
Keywords: piston pump, piston compressor, hybrid power machine, parametrical analysis.
The combination of different machines into a single unit, in addition to expanding its functionality, often makes it
possible to level out the shortcomings of individual machines. This is well demonstrated on the example of volumetric action
piston hybrid machines that perform the functions of a pump and a compressor (simultaneously or alternately) and yet are free
of the main disadvantages of pumps and compressors used individually . Fig. 1 is a schematic diagram of a prospective
piston hydrid machine with gas suction capacity .
The machine works as follows. When the piston moves from the TDC to the BDC in the work space 8, the pressure
decreases, and the gas from the gas chamber 4 of the jacket space 1 enters through the valve 6 into the work space 8. The
pressure in the gas chamber 4 (the suction chamber) decreases, which causes the ﬂ uid to move from the tank 3 through the
tubing 2 to the jacket space 1. At the same time, gas enters the chamber 4 through the tubing 5. At the end of the suction pro-
cess, the valve 6 is closed and the pressure in the chamber 4 begins to rise (to atmospheric). When the piston moves from the
BDC to the TDC in the work space 8, compression and pumping through the valve 7 take place, and the ﬂ uid ﬂ ows into the
tank 3 due to gravity.
To conduct a numerical study, a mathematical model of the working processes taking place in the constant and vari-
able volume chambers of the given machine was developed . The processes of operation taking place in the spaces 4 and 8
of the compressor section were simulated using the ﬁ rst law of thermodynamics of a variable-mass body, the laws of conser-
vation of mass and motion, and the equation of state .
The movement of ﬂ uid in the pump section is the ﬂ ow of ﬂ uid in the connecting tubing 2 and in the jacket space 1, for
which the equation of conservation of the total energy can be represented as a system of two independent differential equations
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