Benefits of integrating displacement pumps and compressors

Shcherba, V. Е.; Bolshtyanskii, A. P.; Kaigorodov, S. Yu.; Kuzeeva, D. A.

doi:10.3103/s1068798x1603014x

Cited by 22 publications

(5 citation statements)

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“…The left side of the equation includes local and convective acceleration, and the right side includes the forces of pressure and viscous friction, respectively grad(p) and Div(τ). Thermodynamic pressure p is determined as p = 1 3 σ xx + σ yy + σ zz , and the stress tensor τ is determined on the basis of the generalized Newton's law of friction:…”

Section: Turbulent Fluid Flowmentioning

confidence: 99%

“…friction forces in the cylinder-piston group decreases; due to leakage of liquid into the working cavity of the pump section from the gap in the piston seal, the cavitation reserve increases [1].…”

Section: Introductionmentioning

confidence: 99%

“…One of the main ways to increase dramatically the efficiency and economy of gas compression is to combine a piston compressor with a piston pump and to obtain a piston hybrid power machine (PHPM) in which gas and liquid are compressed and moved by changing the volume of the working chambers (see Figure 1). Due to the intensive cooling of the suction and compressed gas and the elimination of leaks and leakage losses, the indicator efficiency increases and work is reduced; by eliminating dead space in the compressor section by filling it with fluid, the feed coefficient and productivity of the compressor section are increased; due to the fluid in the gap seal, the work of friction forces in the cylinder-piston group decreases; due to leakage of liquid into the working cavity of the pump section from the gap in the piston seal, the cavitation reserve increases [1].…”

Section: Introductionmentioning

confidence: 99%

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Calculation of the Incompressible Viscous Fluid Flow in Piston Seals of Piston Hybrid Power Machines

et al. 2020

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The article considers the calculation of the flow of a viscous incompressible fluid in piston seals of piston hybrid power machines. The most widely used and effective seals are considered: a smooth gap seal and a step-type gap seal, and—based on the references analyses—the initial boundary conditions for their calculation are determined. The laminar and turbulent flows in gap seals are calculated based on the well-known analytical relationships, experimental studies and flow models, including the k-ε, Menter’s Shear StressTransport (SST) and Reynolds Stress (RSM) turbulence models. The effectiveness of using each model to determine average velocities, flow rates, and velocity plots in the cross section of a gap seal, as well as the adequacy of the description of known physical laws, is estimated. The results proved that the RSM turbulence model is better for the gap seals of different types under different modes of motion.

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Section: Turbulent Fluid Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calculation of the Incompressible Viscous Fluid Flow in Piston Seals of Piston Hybrid Power Machines

et al. 2020

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“…Combining with a compressor is useful for a pump. When combined, the suction cavitation margin increased due to the flow of liquid from the gap in the cylinder-piston group; the work supplied in the cycle decreases due to the utilization of the compressed gas heat [12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Thermophysical Properties of a Droplet Liquid on the Work Processes of a Two-Stage Piston Hybrid Power Machine

et al. 2022

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The article considers the influence of the main thermophysical properties of the power liquid on the working processes and energy characteristics of a new highly efficient two-stage piston hybrid power machine designed to compress gas to medium and high pressures. Mathematical model of the working processes of the machine under study with a pro-filed working chamber of stage 2 has been developed. To verify the developed mathematical model of working processes, a prototype and a stand for its study were created. The visualization of the movement of the liquid piston, measurement of the instant pressure in the working chamber of the machine, energy and consumption characteristics verified the developed mathematical model. As a result of a numerical experiment, we determined that there is an optimal value of the dynamic viscosity of the power liquid, which depends on the angular velocity of the crankshaft and is in the range from 0.005 to 0.02 Pa∙s, with large values referring to large values of the angular velocity. With a decrease in the density of the power liquid, the work of friction forces decreases and the total indicator efficiency increases. The findings of the research can be used when choosing coolants in reciprocating compressors with a liquid piston.

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“…Such a unit is called the hybrid positive-displacement machine [1,2]. Conducted theoretical [3,4] and experimental studies [5,6] showed the result of their combination: • improved the compressed gas cooling; • eliminated compressed gas leakage in the cylinder-piston seal; • improved cylinder-piston group lubrication and the friction work; • eliminated dead space in the compressor [7]; • the positive suction head increased; • the number of moving parts is reduced.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Liquid Piston Compressibility in the Two-Stage Hybrid Positive-Displacement Machine

2021

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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.

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Benefits of integrating displacement pumps and compressors

Cited by 22 publications

References 0 publications

Calculation of the Incompressible Viscous Fluid Flow in Piston Seals of Piston Hybrid Power Machines

Calculation of the Incompressible Viscous Fluid Flow in Piston Seals of Piston Hybrid Power Machines

Analysis of the Influence of Thermophysical Properties of a Droplet Liquid on the Work Processes of a Two-Stage Piston Hybrid Power Machine

Analysis of Liquid Piston Compressibility in the Two-Stage Hybrid Positive-Displacement Machine

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