Influence of crossing angle of swash plate on flow pulsation of axial flow piston pump
The flow pulsation of an axial piston pump is affected by many factors, including the crossing angle of the swash plate. The intersection angle is the angle between the swash plate and the pump axis. Here's how the intersection angle affects flow pulsation:
1. Flow displacement: The intersection angle determines the displacement of the pistons and therefore the volume of fluid displaced by each piston in one revolution. Larger crossover angles generally result in larger displacements of each piston, resulting in higher flow rates and potentially larger flow pulsations.
2. Fluctuation of flow rate: The intersection angle affects the size of the fluctuation of flow rate, which is the change of flow rate after the pump rotates one circle. Smaller crossover angles generally result in lower flow pulsations due to smoother changes in piston stroke and smoother transitions between suction and discharge phases.
3. Flow pulsation frequency: The intersection angle will affect the frequency of flow pulsation. The pulsation frequency is determined by the number of pistons and the speed of the pump. A larger crossover angle can result in a higher pulsation frequency as the piston cycles through its intake and exhaust strokes more quickly.
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4. Pressure pulsation: Flow pulsation is often accompanied by pressure pulsation in the hydraulic system. The crossover angle affects the timing and magnitude of pressure pulsations, thereby affecting the overall performance and stability of the system. Proper design considerations, such as optimizing crossover angles and other pump parameters, can help minimize pressure pulsations.
5. Vibration and noise: The flow pulsation caused by the intersection angle will cause vibration and noise of the pump and hydraulic system. Excessive flow pulsation causes mechanical stress, increased wear and noise generation. Careful design and optimization of crossover angles can help reduce vibration and noise levels.
6. Efficiency and stability: The intersection angle also affects the overall efficiency and stability of pump operation. By optimizing the crossover angle, the pump balances flow, pulsation, and system requirements for increased efficiency and smoother fluid delivery.
7. Cross-flow effect: The intersection angle of the swash plate will introduce a cross-flow effect in the pump. Cross flow is the flow of fluid within the pump from the high pressure side to the low pressure side due to the crossing angle. This cross flow causes flow pulsation and affects the overall flow characteristics of the pump.
8. Optimization of gas distribution timing: the crossing angle of the swash plate is closely related to the gas distribution timing of the pump. Valve timing determines the precise opening and closing of inlet and outlet valves, which affects flow and pressure pulsation. Optimal valve timing combined with proper crossover angle helps minimize flow pulsation and improve overall pump performance.
9. Control strategies: Control strategies can be implemented to mitigate flow pulsation caused by intersection angles. For example, variable displacement pumps allow the angle of the swash plate to be adjusted to regulate flow and reduce flow pulsation. By actively controlling the intersection angle or using advanced control algorithms, flow pulsations can be minimized, resulting in smoother pump operation.
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10. Computational Fluid Dynamics (CFD) Analysis: Computational Fluid Dynamics simulations can be used to analyze flow behavior and pulsation in axial flow piston pumps. By modeling the fluid flow and pressure distribution within the pump, CFD simulations provide insight into the effect of intersection angles on flow pulsations. This information can guide design modifications and optimization efforts.
11. Experimental testing: Experimental testing is crucial to verify theoretical analysis and simulation results. Constructing a test setup to measure flow, pressure pulsation, and other relevant parameters can provide real data on the flow pulsation characteristics of a pump. The relationship between crossing angle and flow pulsation can be further understood by carrying out experimental tests on different crossing angles.
12. Design optimization: According to the analysis and experimental data, design optimization can be carried out to minimize the flow pulsation caused by the intersection angle. This may involve adjusting crossover angles, optimizing valve timing, improving component geometry or employing damping mechanisms to reduce flow pulsations. Iterative design improvements can result in pumps with reduced flow pulsation and improved performance.
By considering these additional factors and performing a comprehensive analysis, including numerical simulations and experimental tests, a better understanding of the effect of crossing angle on flow pulsation in axial flow piston pumps can be obtained. This understanding enables design optimization and the development of control strategies for smoother and more efficient pump operation.
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