Linear compressor discharge valve behavior using a rigid body valve model and a FSI valve model

Hwang, Il Sun; Park, Sang Jun; Oh, Wonsik; Lee, Young Lim

doi:10.1016/j.ijrefrig.2017.05.034

Cited by 39 publications

(5 citation statements)

References 9 publications

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“…However, the results from the FSI model can be close to the test results. Hwang et al [16] held the same point by establishing the FSI model and the rigid body model of the discharge valve. Choi et al [17] also used the FSI method to investigate the effect of the conical spring preload in a discharge valve on the dynamic behavior of valve assembly.…”

Section: Introductionmentioning

confidence: 93%

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Sun²,

Zou

et al. 2023

Sustainability

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In a linear compressor, the valve motion significantly affects the thermodynamic efficiency and the compressor’s reliability, especially in oil-free conditions. To better understand the dynamic behavior of the discharge valve, a real-time test bench was built. The piston movements and dynamic pressure in the cylinder were also observed to obtain the synchronizing characteristics among the reed valve motion, cylinder pressure, and piston motion. Observing the motion of the discharge valve visually, the discharge valve flutters due to the change in the form of the cylinder pressure, the delayed opening of the valve is caused by the inertia of the valve itself, and additional displacement fluctuations are present. This paper presents the dynamic behavior of the discharge valve under different discharge pressure/operating frequency/piston stroke/clearance length conditions. The results show that the valve flutters increase, the mean displacement of the valve increases, and the duration of the discharge increases when the discharge pressure decreases. When the operating frequency increases, the duration of the discharge decreases, while the mean displacement of the valve increases. For a high stroke or a low clearance length case, the duration of the discharge increases, while the valve flutters increase due to the pressure fluctuations in the cylinder. Through analyzing the synchronizing characteristic among the valve movements, piston movements, and cylinder pressure, it is shown that the phenomenon of the delayed opening valve is much worse for a low stroke or a high operating frequency case. In addition, the delayed closing of the valve appears for a high operating frequency case (75 Hz).

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Section: Introductionmentioning

confidence: 93%

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Sun²,

Zou

et al. 2023

Sustainability

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“…Lang 17 used a FSI methodology to study the dynamic behavior of valves in a hermetic reciprocating compressor and the overall performance were analyzed by varying suction valve parameters. Choi 18 and Hwang 19 investigated the valve dynamics in linear compressor by FSI method. Pereira 20 analyzed the variation rules of effective flow and force areas of reed-type valves in small-scale compressors by considering the effects of piston.…”

Section: Introductionmentioning

confidence: 99%

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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“…Hwang et al [21,22] established an FSI model to study the performance of the discharge valve. Moreover, the results showed that the valve lift obtained from the 3D fluid-structure interaction model was basically consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Dynamic Characteristics of the Reed Valve in Compressors Based on Fluid-Structure Interaction Method

Wang

Jin

et al. 2021

Applied Sciences

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The flow in the gap between the reed and the valve seat has a significant influence on the dynamic characteristics of the reed valve used in reciprocating compressors. The fluid–structure interaction (FSI) method is an effective method for studying reciprocating compressors. A three-dimensional FSI model of a reciprocating compressor with a reed valve is established in this paper, which has an important influence on the flow rate characteristic of reciprocating compressors. Furthermore, an experimental investigation is implemented to verify the FSI model. Based on the established FSI model, the pressure distribution on the reed valve surface is identified by varying the height of the suction valve limiter and the rotational speed of the compressor, which has an important effect on the dynamic characteristics of the reed valve. Although the low-pressure region, due to the Bernoulli effect on the surface of the reed, hinders the rapid opening of the valve to some extent, it is obviously beneficial to the timely closure of the valve and increases the volumetric efficiency of the compressor. Moreover, the optimal height of the valve limiter and the appropriate rotational speed of the compressor are obtained.

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Linear compressor discharge valve behavior using a rigid body valve model and a FSI valve model

Cited by 39 publications

References 9 publications

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System

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

Investigation on Dynamic Characteristics of the Reed Valve in Compressors Based on Fluid-Structure Interaction Method

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