Numerical analysis of seat impact of reed type valves

Lajús, Francisco C.; Deschamps, César J.; Alves, Marcı́lio

doi:10.1533/9781782421702.10.555

Cited by 7 publications

(5 citation statements)

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“…The dynamic pressure in the cylinder and in the discharge duct downstream of the discharge valve was measured using a pair of optomechanical pressure sensors (Fig. 2, AutoPSI D82294-Q, Optrand, USA) (2). All three signals were synchronized with the crankshaft position sensed by an incremental encoder (Fig.…”

Section: Measurement Setupmentioning

confidence: 99%

“…This approach, however, does not reflect all effects present during realworld operation of the compressor. Another approach is a numerical solution of the problem using Computational Fluid Dynamics and Finite Elements Method (CFD/FEM) [2,3]. However, given the substantial complexity of the computations and quantity of the input data the interaction of a compressible fluid (gas) and a non-rigid body (valve) is greatly simplified, leading to less accurate results.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of reed valve kinematics

Fenkl

Dvořák

Vít

2016

EPJ Web of Conferences

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Abstract. The measurement of key kinematic parameters of a reed valve movement is necessary for the further development of the reed valve system. These parameters are dependent on the geometry and material properties of the valve. As they directly affect the quantity of air flowing around the valve, a simple and easy to implement measurement of various valve configuration based on the air flow has been devised and is described in this paper, along with its technical parameters and drawbacks when evaluating reed valves used in reciprocating air compressors. Results are presented for a specimen of a compressor under examination. All kinematic parameters, and timing of the opening and closing of the valve, obtained from the measurement are presented and discussed.

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Section: Measurement Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of reed valve kinematics

Fenkl

Dvořák

Vít

2016

EPJ Web of Conferences

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“…For investigating the transient flow conditions and valve motions in reciprocating compressor, CFD methods were applied to analyze the in-cylinder thermodynamic process and valve dynamic characteristics. Matos 15,16 carried out a numerical methodology to analyze the dynamic characteristics of reed type valve of refrigerating compressors and the transient force and flow were obtained and revealed. 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.…”

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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“…There are different studies where impact stresses are analyzed, in some works the principal stresses [4,8] are analyzed while in others equivalent stresses such as that of Von Mises [9] are taken into consideration. In some cases commercial software are used [4,8,10], while in others in-house codes are developed [11,9]. Generally, in these works it is also of interest to obtain the valve displacements as well as the impact velocity [12].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Fluid-Structure Interaction and Impact Force on a Reed Valve

Castrillo¹,

Schillaci²,

Rigola³

2021

14th WCCM-ECCOMAS Congress

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The cyclic impact force between a reed valve and the seat plate is the main reason of the valve failure in many thermo-technical devices as compressors, engines, etc. According to experimental observations the latter is due to fatigue and usually occurs in the leading part of the valve 'neck'. In this work, a complex numerical analysis is presented aimed to studying the external forces and internal stresses suffered by the valve. In particular, the impact force between the valve and the seat is studied.The numerical analysis relies on the coupled synergy of two different simulation concepts. In order to do so, two codes are used: (1) first, the in-house Computational Fluid Dynamics (CFD) code presented in [1] is employed to simulate the Fluid-Structure Interaction (FSI) between gas and valve, extracting reference data for valve displacement and external gas pressures; (2) second, the analysis of the internal structure stresses, together with the impact forces with the plate is implemented in a Computational Solid Dynamics (CSD) code developed in FreeFEM++ [2].The impact force representation is based on the formulation presented in [3] where a conserving algorithm for frictionless dynamic contact/impact is developed. Due to the importance of obtaining an adequate impact force, an exhaustive study is carried out on its characterization in terms of numerical parameters, such as the penalty stiffness. Under this framework, the valve displacement and impact velocities are verified. Hence, impact forces are analysed in different scenarios, obtaining interesting observations about stresses distribution, with a particular focus on the points where failure is experienced.

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Numerical analysis of seat impact of reed type valves

Cited by 7 publications

References 0 publications

Measurement of reed valve kinematics

Measurement of reed valve kinematics

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

Simulation of Fluid-Structure Interaction and Impact Force on a Reed Valve

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