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Fluid dynamic characteristics and flow distribution structure optimization of axial piston pump considering cavitation bubble evolution
Author(s): Yang Pan, Anhua Chen, Zhineng Wang
Keywords: Axial piston pump; Cavitation bubble; Flow ripple; MSPOS; Optimization
In the transition process of high and low pressure of axial piston pumps, severe cavitation occurs when the pressure of the piston chamber is lower than the air separation pressure. Cavitation bubbles expand, compress, rebound and collapse when they enter the high pressure oil drainage area. It is thus inevitable that the piston chamber oil discharge volume produces shock pulsations. This affects the outlet flow ripple as well as the pressure pulsation of the piston pump. However, the effect of cavitation bubble is ignored in the current outlet flow ripple model of axial piston pumps. In this paper, a single cavity dynamic model is established to study the bubble evolution as the piston chamber pressure changes. According to the cavitation cloud (group cavitation) characteristics of the axial piston pump, the theoretical model of the outlet flow ripple and the pressure pulsation of the piston pump are then established considering cavitation bubble characteristics. The influence of cavitation characteristics on the outlet flow ripples and pressure pulsation of the axial piston pump is analyzed and compared to the situation without cavitation. Through comparison with experimental results, it is verified that the outlet flow ripple model becomes more accurate when considering cavitation bubble characteristics. The results show that cavitation bubble has a significant influence on the design of the valve plate of piston pumps. Based on the multi-agent particle swarm optimization (MSPOS) algorithm, an optimization model of the piston pump outlet flow ripple was established considering cavitation bubble characteristics. The optimized design parameters for the flow distribution area of the axial piston pump were evaluated.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.