Suction mufflers, CFD, Turbulence
The aim of this paper is to present a group of numerical experiments of the fluid flow through different suction mufflers geometries to analyse pressure and velocity behaviour in addition with acoustic pressure effect. The numerical results are oriented to compare how suction muffler geometry affects mas flow rate and compressor efficiency performance on one side and pressure pulsations, transmission losses and compressor noise on the other side (1). The CFD&HT results have been obtained by means of TermoFluids code, a new unstructured and parallel object-oriented CFD&HT code for accurate and reliable solving of industrial flows (2). In all studied cases a multi-dimensional explicit finite volume fractional-step based algorithm has been used with symmetry preserving discretization scheme. When turbulence modelling is needed, an extension of the Yoshizawa non-equilibrium fixed-parameter subgrid-scale (3) model to non-structured meshes is used. The pressure equation is solved by means of parallel Fourier Schur decomposition solver, which is an efficient direct solver for loosely coupled PC clusters (4). Different CFD analysis of compressor suction mufflers has been developed (5) mainly based on k-e RANS models. The present paper is oriented on Large Eddy Simulation (LES) models. On the other hand, boundary conditions are coupled with a modular, unstructured and object oriented tool of the numerical simulation of hermetic reciprocating compressors (6)(7). (1) W. Soedel, Mechanics, simulation and design of compressor valves, gas passages and pulsation mufflers, Purdue University, 1992. (2) O. Lehmkuhl, R. Borrell, C.D.Pérez-Segarra, M. Soria, A. Oliva, A new parallel unstructured CFD code for the simulation of turbulent industrial problems on low cost PC cluster, Parallel Computational Fluid Dynamics, Ankara, Turkey, 2007. (3) W. Rodi, DNS and LES of some engineering flows, Fluid Dynamic Research, vol. 38, pp. 145-173, 2006 (4) R. Borrell, O. Lehmkuhl, M. Soria, A. Oliva; Direct Schur method for the solution of Poisson equation with unstructured meshes; Parallel CFD Congress, Antalya, Turkey, 2007 (5) (4)K. Sar?o?lu, A. Özdemir, A. Kaya, E. O?uz, An experimental and numerical analysis of refrigerant flow inside the suction muffler ofhermetic reciprocating compressor, International Compressor Engineering Conference at Purdue, 2012. (6) R. Damle, J. Rigola, C.D. Pérez-Segarra, J. Castro, A. Oliva, “Object oriented simulation of reciprocating compressors: Numerical verification and experimental comparison”, International Journal of Refrigeration, 34 (2011) 1989-1998. (7) J. López, O. Lehmkuhl, J. Rigola, C.D. Pérez-Segarra, “ Use of Low-Mach modelo n a CFD&HT solver for the elements of an object oriented program to numerically simulate hermetic reciprocating compressors”, International Compressor Engineering Conference at Purdue, 2012.