This paper first introduces the structure and working principle of a 2D piston pump invented by the research team that the authors are involved with. Afterward, the mechanism of the churning losses caused by the pump’s moving parts, which are rotating in oil, is carefully studied by building up mathematical models and using CFD simulations. A test rig is set up to estimate the churning losses of the moving parts by monitoring the torque at different rotational speeds. The analytical results indicated that the torque of the churning losses increased with the increase of the rotational speed. In addition, the experimental data of the churning losses were consistent with the solutions from both the conducted mathematical models and CFD simulations before the rotational speed reached 8000 rpm. However, when the rotational speed exceeded 8000 rpm, the experimental data showed an apparent difference from the calculated ones. Based on the changes in the oil temperature and noise, this difference might be due to cavitation or turbulence. As a result, the churning losses that took place in the 2D high-speed piston pump need to be further studied, especially when the pump is driven by a high-speed motor.

本文首先介绍了研究团队发明的二维活塞泵的结构和工作原理。之后，通过建立数学模型并使用CFD模拟，仔细研究了由泵在油中旋转的运动部件引起的搅拌损失的机理。设立了一个试验台，通过监测不同转速下的扭矩来估算运动部件的搅拌损失。分析结果表明，搅拌损耗的转矩随转速的增加而增大。另外，在转速达到8000 rpm之前，搅拌损失的实验数据与所进行的数学模型和CFD模拟得出的结果一致。但是，当转速超过8000 rpm时，实验数据表明与计算值有明显差异。根据机油温度和噪音的变化，这种差异可能是由于气蚀或湍流引起的。因此，需要进一步研究2D高速活塞泵中发生的搅动损失，尤其是当泵由高速电机驱动时。