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Numerical simulation and analysis of temperature and flow field of high-speed axial piston motor pump
Author(s): Dianrong Gao, Zongyi Zhang, Yanan Sun, Senhao Xu, Jingcheng Liu, Yan Zhang
Source: The Journal of Engineering, Volume 2019, Issue 13, 2019 , p. 127 - 131
Type: Article
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Based on the theories of heat transfer and the method of computational fluid dynamics, a liquid–solid mathematical model of heat transfer of an axial piston hydraulic motor pump is constructed in this study. Through the finite volume method, the model with different cooling runners has been solved. Meanwhile, the oil flow regularity of runner and temperature distribution of the motor pump and oil duct has been obtained. On the basis of the model of long-strip runner, the influence of ambient temperature on the motor pump's temperature rise has been analysed. The result shows that the cooling channels on the housing of the hydraulic motor pump effectively reduce the temperature rise, and a long-strip channel is for optimum cooling. The average temperature rise of the motor pump increases linearly with the increase of ambient temperature.

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Analysis on anti-wear mechanism of bionic non-smooth surface based on discrete phase model
Author(s): Dianrong Gao, Jingcheng Liu, Xuehan Xu, Zongyi Zhang
Source: The Journal of Engineering, Volume 2019, Issue 13, 2019 , p. 32 - 36
Type: Article
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In order to study the lubrication and anti-wear mechanism of the pit-type bionic non-smooth surface used in the low-speed and high-torque seawater hydraulic motor valve plate pair, the discrete phase models of the four pits are simulated under different working conditions. In this study, the trajectories of different diameters particles in the hemispherical pits are analysed, which can reflect the movement of different sizes and masses wear debris in the pits. The discrete phase concentration distributions of the four-kind pits, hemispherical pits, cylindrical pits, four-prism pits and tri-prism pits, are simulation under the same working conditions, which reflects the effect of pit geometry on the movement of wear debris. The discrete phase concentration distributions of four pits moving at different rotation speeds and different rotation radii are calculated, which indicates that the rotation speed of the motor and the distribution of pits on the valve plate will affect the ability of the pit to store wear debris.

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