Simulation of a water hammer in an axial piston pump

The paper presents an approach to modeling an axial piston pump compact series with an inclined block and performed a hydrodynamic calculation. Existing models of the axial piston pump were studied, during which a jump in flow was found at the time of water hammer, but the "shock magnitude" was unknown. During modeling, assumptions related to the properties of the working fluid and the geometry of the plunger were introduced, and temperature changes were also not taken into account. Four stages were identified in the modeling process. The first stage involves the creation of a fluid volume - a fluid model from a solid model of the pump. In the second step, a mesh was created. The third stage is devoted to creating macros for the movement of the previously selected pump components. At the fourth stage, all prepared parts of the model are uploaded to Fluent 18.1 and the calculation parameters are set. The adequacy of the resulting model was assessed by comparing the simulated total pump flow with the theoretical flow calculated analytically. Upon the simulation, the amplitude of the pressure jump was calculated during the water hammer in the operating mode of the pump at the maximum discharge pressure. A method was proposed to reduce it. Changes have been made to the design of the plunger. The strength of the modified structure was calculated.