Effect of the piston position on the effective flow and force areas of rolling-piston compressors.

Effective force and flow areas are widely used to estimate the mass flow rate through the reed-type valves in lumped simulation models. However, despite its effect on the flow, the distance between the piston and the discharge port is a parameter that is not commonly considered when calculating the effective areas. The increase of flow restriction caused by the reed-type valve and discharge channel geometry as the piston gets closer to the discharge port is the main effect neglected when the piston postion is not considered. This paper reports a three dimensional model to simulate the discharge process of rolling piston compressor. The model was employed to analyse the influence of the piston on the effective flow and force areas of the discharge reed-type valve of a rolling-piston compressor. Based on the numerical results, correlations are proposed for the effective flow and force areas considering the piston position. Results for the indicator diagram and discharge losses show the importance of the new approach.

有效力面积与有效流通面积被广泛用于集总仿真模型中估算簧片阀的质量流量。然而，尽管活塞与排气口的距离对流动存在影响，该参数在计算有效面积时却未被普遍考虑。当忽略活塞位置时，活塞靠近排气口过程中由簧片阀及排气通道几何结构导致的流动阻力增大是主要被忽视的效应。本文提出了一种三维模型以模拟滚动活塞压缩机的排气过程。该模型被用于分析活塞对滚动活塞压缩机排气簧片阀有效流通面积及有效力面积的影响。基于数值计算结果，本文提出了考虑活塞位置的有效流通面积与有效力面积关联式。示功图与排气损失的计算结果表明了该新方法的重要性。