The aim of this study is to provide further insight into the flow process during startup for oil supply system of a variable speed rotary compressor. The oil climbing process during startup is usually too short to be captured experimentally. With the help of a high speed camera, a novel experimental test rig has been designed and built to perform the measurements of oil climbing time, which is defined as the amount of time needed for an oil particle to travel from the oil sump to the radial oil feeding holes. The proposed flow visualization methodology is capable of acquiring instantaneous state of oil flow inside the oil pump and also provides qualitative information about the flow features at different operating conditions. Significant design parameters associated with the oil climbing time such as oil viscosity, oil level height as well as the rotational speed have been studied. Experimental results indicate that the oil supply system may even fail when the rotational speed is too low and changes of oil viscosity, oil level height and the rotational speed have a pronounced influence on the oil climbing time. The visualization technique in this study could offer valuable insight to enhance the understanding of startup characteristics for oil supply system of a variable speed rotary compressor.

这项研究的目的是为变速旋转式压缩机的供油系统启动期间的流动过程提供进一步的见解。启动期间的爬油过程通常太短，无法通过实验捕获。在高速相机的帮助下，设计并建造了一种新型的实验测试装置来执行爬油时间的测量，爬油时间的定义是油粒从油底壳移动到径向的时间。供油孔。所提出的流量可视化方法不仅能够获取油泵内油流的瞬时状态，而且还可以提供有关在不同工况下的流量特征的定性信息。与爬油时间相关的重要设计参数，例如油粘度，研究了油位高度以及转速。实验结果表明，当转速太低时，供油系统甚至可能失效，并且油粘度，油位高度和转速的变化对爬油时间有显着影响。这项研究中的可视化技术可以提供宝贵的见识，以增进对变速旋转压缩机供油系统启动特性的理解。