Abstract
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.
Highlights
Received: 2 March 2021Accepted: 16 April 2021Published: 27 April 2021Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.In industry, reciprocating compressors are widely used [1], for instance, in refrigeration [2], air compression [3,4], petrochemical industry [5], and liquefied natural gas [6].During the working process of the reed valve, the reed valve will deform and move under the action of the pressure difference on both sides of the reed
With the development of methods and techniques to study fluid–structure interaction [15,16,17] and the great improvement in computing ability, the fluid– structure interaction (FSI) method [18], which can reveal the physical essence of the coupling between the valve gap flow and the dynamic characteristics of the valve, had been gradually applied to the study of reciprocating compressors [19,20]
This study investigated the Bernoulli effect in the valve gap and its impact on the dynamics of the suction valve in reciprocating compressors
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The quasi-dimensional model can accurately simulate the volumetric efficiency, adiabatic efficiency, and valve movement of the compressor from a macro level It cannot analyze the flow process of the compressor in more detail, such as temperature distribution [13], the coupling characteristics of the valve gap flow, and the valve dynamics. With the development of methods and techniques to study fluid–structure interaction [15,16,17] and the great improvement in computing ability, the FSI method [18], which can reveal the physical essence of the coupling between the valve gap flow and the dynamic characteristics of the valve, had been gradually applied to the study of reciprocating compressors [19,20]. The influence of the surface pressure distribution of the reed valve on the dynamic characteristics of the compressor is identified based on the FSI model. Sci. 2021, 11, 3946 new perspective to reveal the key factors affecting the dynamic characteristics of the valve and improve the performance of reciprocating compressors
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