Numerical analysis of the turbulent fluid flow through valves. Geometrical aspects influence at different positions

9th International Conference on Compressors and their Systems

Rigola, J.^1 ; Aljure, D.^1 ; Lehmkuhl, O.^1,2 ; Pérez-Segarra, C.D.^1 ; Oliva, A.^1

Heat and Mass Transfer Technological Center (CTTC), Universitat Politcnica de Catalunya Barcelona Tech (UPC), C/ Colom, 11, Terrassa, Barcelona

08222, Spain^1

Termo Fluids, S.L. C/ Magf Colet, Sabadell, Barcelona

0 08204, Spain^2

关键词: Geometrical aspects;    Geometrical conditions;    Hermetic reciprocating compressor;    Industrial flows;    Numerical experiments;    Numerical results;    One-dimensional model;    Turbulent fluid flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/90/1/012026/pdf
DOI  :  10.1088/1757-899X/90/1/012026

来源: IOP

【 摘 要 】

The aim of this paper is to carry out a group of numerical experiments over the fluid flow through a valve reed, using the CFD&HT code TermoFluids, an unstructured and parallel object-oriented CFD code for accurate and reliable solving of industrial flows. Turbulent flow and its solution is a very complex problem due to there is a non-lineal interaction between viscous and inertial effects further complicated by their rotational nature, together with the three-dimensionality inherent in these types of flow and the non-steady state solutions. In this work, different meshes, geometrical conditions and LES turbulence models (WALE, VMS, QR and SIGMA) are tested and results compared. On the other hand, the fluid flow boundary conditions are obtained by means of the numerical simulation model of hermetic reciprocating compressors tool, NEST-compressor code. The numerical results presented are based on a specific geometry, where the valve gap opening percentage is 11% of hole diameter and Reynolds numbers given by the one-dimensional model is 4.22 105, with density meshes of approximately 8 million CVs. Geometrical aspects related with the orifice's shape and its influence on fluid flow behaviour and pressure drop are analysed in detail, furthermore, flow results for different valve openings are also studied.