3-D Transient CFD Model For A Rolling Piston Compressor With A Dynamic Reed Valve

In this paper, a full 3D transient computational fluid dynamics (CFD) model for a rolling piston compressor with reed valve is described in detail. In the proposed model, a moving/deforming mesh algorithm was developed for the fluid pockets of the compressor. The bending of the reed valve is modeled as a rotational structure with a moving/deforming mesh for the affected fluid volume. The motion of the valve is solved using a one dimensional rotational ordinary differential equation (ODE). Important parameters of the rotational dynamics, such as the torsion constant, are derived from bending cantilever beam theory. The meshing and re-meshing algorithms for the fluid volumes of rolling piston and the rotational valve were implemented in a CFD package PumpLinx. The test simulation of a generic rolling compressor with a discharger reed valve demonstrates that the algorithms and the implementations are robust, fast and user friendly, and can be readily applied to rolling piston compressor systems.

[1]  Raimund Almbauer,et al.  Valve Lift Measurement for the Validation of a Compressor Simulation Model , 2008 .

[2]  Subhrajit Dey,et al.  A Valve Design Methodology For Improved Reciprocating Compressor Performance , 2012 .

[3]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[4]  Christopher S. Lynch,et al.  Mechanics of Materials and Mechanics of Materials , 1996 .

[5]  Koji Morinishi,et al.  Study of CFD Considering Valve Behavior in Reciprocating Compressor , 2010 .

[6]  Daniel Nagy,et al.  Influence of the Main Parameters of the Suction Valve on the Overall Performance of a Small Hermetic Reciprocating Compressor , 2008 .

[7]  Cesar J. Deschamps,et al.  A Procedure to Optimize Reed Type Valves Considering Efficiency and Bending Fatigue , 2012 .

[8]  J. R. Lenz,et al.  Application of Computational Fluid Dynamics to Compressor Efficiency Improvement , 1994 .

[9]  B. G. Shiva Prasad.  CFD for Positive Displacement Compressors , 2004 .

[10]  Haiyang Gao.  Numerical Simulation of Unsteady Flow in a Scroll Compressor , 2014 .

[11]  T. Daxner,et al.  A Universal Simulation Tool for Reed Valve Dynamics , 2004 .

[12]  Ahmed Kovacevic,et al.  Influence of approaches in CFD Solvers on Performance Prediction in Screw Compressors , 2014 .

[13]  Yusheng Hu,et al.  Investigation of Refrigerant Flow Simulation and Experiment of Rolling Piston , 2010 .

[14]  Wei Geng,et al.  THE PERFORMANCE OPTIMIZATION OF ROLLING PISTON COMPRESSORS BASED ON CFD SIMULATION , 2004 .