Efficiency evaluation of a miniature multi-stage compressor under insufficient inter-stage cooling conditions

Liu, Yinshui; Miao, Na; Deng, Yipan; Wu, Defa

doi:10.1016/j.ijrefrig.2018.09.009

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…The mass conservation equation for the in-cylinder gas can be expressed by followingWhere dmi/dθ and dmo/dθ are the mass flow rate through valve ports and they are expressed as following 2 Where symbol “sign(pi−pc)” is the flow direction parameter: +1 for pi>pc while −1 for pi<pc. Also, sign(pc−po) means: +1 for pc>po while −1 for pc<po.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…In MHPC with swash-plate structure, the instantaneous piston position can be given by following when considering the top dead center as the starting point 2 Where R0 is distribution circle radius of cylinder holes while γ is swash plate angle.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…Miniature high pressure compressor (MHPC), which can compress gas to a high pressure (over 30 MPa), is key component of continuous gas supply system in aircraft. 1,2 Miniature oil-free high-pressure compressor with wobble-plate or swash-plate structure are attracting the attention of some researches and they current focus on the cooling efficiency of intercooler or the fatigue failure of core motion mechanism. [3][4][5] Compared with traditional high pressure compressor, the in-cylinder volume of miniature high pressure compressor are relatively smaller, especially for high-pressure stage.…”

Section: Introductionmentioning

confidence: 99%

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Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Deng

Jiang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Miniature high pressure compressor (MHPC) is key component of continuous gas supply system in aircraft for missile launching and infrared cooling. Valve design makes a crucial role in reciprocating compressors and traditional valves in high-pressure reciprocating compressors usually occupy a large space, have relative larger clearance volume and spring stiffness, which are incompetent to be applied to MHPC. In this study, integrated reed valves with four cantilevers on a steel plate are proposed to serve as the suction valves and discharge valves in MHPC. By this method, the number of valve parts and the axial dimension can be greatly reduced. Theoretical research has been carried out to reveal the dynamic characteristics of the proposed integrated valves. Numerical methods based on equivalent model of cantilever valve are proposed to improve the calculating efficiency compared to traditional CFD method. The equivalent stiffness and equivalent mass for valve motion equations have been calculated and plugged into the whole mathematical models. Based on the optimized valve parameters, experimental investigation on MHPC has been carried out.

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Section: Mathematical Modellingmentioning

confidence: 99%

Section: Mathematical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Deng

Jiang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

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show abstract

“…However, due to the complex and overlapping valve runners of the reciprocating pumps, implementing the visualization experiment of the multiphase flow in the pump cavity and valve clearance is very complicated. On the other hand, mature theoretical models such as the twophase flow model for the pipeline (Henau & Raithby, 1995;Inada et al, 2004;Liapidevskii & Tikhonov, 2019) and the performance prediction model for the reciprocating compressor (Liu et al, 2019;Roskosch et al, 2017;Xiao et al, 2018) are not fully applicable in describing the actual work of the reciprocating multiphase pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Zhang

2020

Engineering Applications of Computational Fluid Mechanics

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Instantaneous gas-liquid flow and distribution have an important influence on the performance of a multiphase pump, especially under the high gas content conditions. How to accurately simulate the complete working cycle of a multiphase pump and reflect the transient oil-gas flow inside the pump cavity are the main difficulties of the study. A three-dimensional whole-cycle numerical simulation has been conducted to predict the void fraction waves of the reciprocating multiphase pumps under the high gas rates and to evaluate the effects of multi-case parameters on its pulsation characteristics. The instantaneous two-phase distribution and fluctuation characteristic accompanying the movement of the piston and the valves during each process of the multiphase pump are innovatively obtained under the high gas rates. Five different ideal gas model and real gas models used in this simulation are compared and optimized first, and then validated by the experimental results. Void fraction wave signals in the time and frequency domains are obtained from multiple working cycles of the multiphase pump, and the pulsation rates, propagation speeds, amplitudes, and power spectral densities are analyzed in great detail under different inlet gas contents, pressure ratios, crank speeds, and stroke lengths.

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“…Reciprocating compressor is often applied in many high-pressure fields such as aerospace, natural gas and energy storage [1]- [3]. But it can produce a lot of heat as a positive displacement compressor [4].…”

Section: Introductionmentioning

confidence: 99%

Energetic Macroscopic Representation of Self-Air-Cooling Reciprocating Compressor’s Cooling System

Liu

2020

IEEE Access

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The self-air-cooling system, as an important part of reciprocating compressor, can continuously cool the cylinder without any auxiliary equipment, which is key to energy saving and efficiency increasing especially for high-pressure micro-compressor. Since it is a complex thermodynamic system with compressible fluid transmission and heat exchange between multiple different subsystems, establishing an accurate mathematical model is very difficult. The thermodynamic models of subsystem are respectively established based on the energetic macroscopic representation (EMR). The EMR model of cooling system is achieved by connecting them based on its working principles, which makes the solving process clear and improves the readability. It is verified by good curve-fitting performance between simulation and experiment in different conditions, which provides foundation for parameters characteristic analysis and structure optimization design. INDEX TERMS Energetic macroscopic representation, self-air-cooling, compressor.

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Efficiency evaluation of a miniature multi-stage compressor under insufficient inter-stage cooling conditions

Cited by 18 publications

References 25 publications

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Energetic Macroscopic Representation of Self-Air-Cooling Reciprocating Compressor’s Cooling System

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