CFD analysis of linear compressors considering load conditions

10th International Conference on Compressors and their Systems

Bae, Sanghyun^1 ; Oh, Wonsik^1

Department of Refrigerator Compressor, LandA Research Centre, LG Electronics, 51 Gasan digital 1-ro, Geumcheon-gu, Seoul, Korea, Republic of^1

关键词: Computational fluid dynamics analysis;    Electrical equations;    Input voltages;    Linear compressors;    Mechanical equations;    Pressure differences;    Separate analysis;    User-defined functions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012070/pdf
DOI  :  10.1088/1757-899X/232/1/012070

来源: IOP

【 摘 要 】

This paper is a study on computational fluid dynamics (CFD) analysis of linear compressor considering load conditions. In the conventional CFD analysis of the linear compressor, the load condition was not considered in the behaviour of the piston. In some papers, behaviour of piston is assumed as sinusoidal motion provided by user defined function (UDF). In the reciprocating type compressor, the stroke of the piston is restrained by the rod, while the stroke of the linear compressor is not restrained, and the stroke changes depending on the load condition. The greater the pressure difference between the discharge refrigerant and the suction refrigerant, the more the centre point of the stroke is pushed backward. And the behaviour of the piston is not a complete sine wave. For this reason, when the load condition changes in the CFD analysis of the linear compressor, it may happen that the ANSYS code is changed or unfortunately the modelling is changed. In addition, a separate analysis or calculation is required to find a stroke that meets the load condition, which may contain errors. In this study, the coupled mechanical equations and electrical equations are solved using the UDF, and the behaviour of the piston is solved considering the pressure difference across the piston. Using the above method, the stroke of the piston with respect to the motor specification of the analytical model can be calculated according to the input voltage, and the piston behaviour can be realized considering the thrust amount due to the pressure difference.