周期性泵吸作用下液滴撞击液面过程的气泡生成、演变及其对油液可压缩性影响

多类加氢站压缩机采用液压技术传动，掌握高压/超高压增压过程中液压工质含气时的动力传递特性，是研究高效高可靠增压技术亟需解决的共性关键基础问题。本项目拟从液压油返回底部具有周期性油泵抽吸作用的油池的过程入手，跟踪飞溅油滴撞击油池产生的气泡运动轨迹，建立液滴群-衍生气泡群-泵吸捕捉气泡群时液滴与泵吸流动的无量纲参数分析模型，获得捕捉气泡时的液滴的临界无量纲数范围，确定泵吸出口含气率变化规律；分析高压/超高压增压腔内流动过程中气泡群的相互作用和形态演变特征，获得补油含气率对气液相界面演变过程特征的影响规律；研究交变压力作用下含气液压油中气泡群形态演变引起的流动流型及其可压缩性动态变化特征，揭示气泡群形态演变对驱动力传递特性规律的影响机制，为提高高压/超高压液驱传动压缩机效率和可靠性奠定理论基础。

Many types of hydrogen refueling station compressors are based on hydraulic technology, and mastering the power transmission characteristics of the hydraulic working fluid in the process of high-pressure/ultra-high-pressure compression is a key and basic problem that urgently needs to be solved before investigating high-efficiency and high-reliability compression technology. This project intends to start with the process of returning the hydraulic oil to the oil pool with periodic oil pump suction at the bottom, tracking the movement trajectory of bubbles generated by splashing oil droplets impacting the oil pool, and establishing a droplet group-derived bubble group-pumping to capture the bubbles. The non-dimensional parameter analysis model of droplet and pumping flow, obtains the critical non-dimensional number range of the droplet when trapping bubbles, determines the change law of the pump suction outlet gas content; analyzes the bubbles during the flow in the high pressure/ultra-high pressure booster cavity The interaction and morphological evolution characteristics of the air bubbles are obtained, and the influence of the air content of the oil supplement on the characteristics of the gas-liquid interface evolution process is obtained; the flow pattern and its potential caused by the evolution of the bubble group in the gas-bearing hydraulic oil under the action of alternating pressure are studied. The dynamic characteristics of compressibility reveal the influence mechanism of bubble group morphology evolution on driving force transmission characteristics and lay a theoretical foundation for improving the efficiency and reliability of high-pressure/ultra-high-pressure hydraulic drive compressors.