Gap Flow Simulation Methods in High Pressure Variable Displacement Axial Piston Pumps

Zawistowski, Tomasz; Kleiber, Michał

doi:10.1007/s11831-016-9180-5

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…In recent years, the numerical simulation method has become a common method for research [20][21][22][23]. In this numerical simulation, the time-averaged Navier-Stokes equation is adopted to describe flow [24,25].…”

Section: Turbulence Modelmentioning

confidence: 99%

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

Lü

Liu

et al. 2021

JMSE

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The shaft front-positioned tubular pump device has been widely used in practical engineering, but the shaft rear-positioned pump device is rarely used due to its low efficiency. To investigate the effect of the shaft position on the performance of a tubular pump device, the optimized shaft front-positioned and shaft rear-positioned pump devices were compared and studied. Both tubular pump devices adopt a TJ04-ZL-06 pump model. Three dimensional steady and unsteady numerical simulations combined with model tests were used to compare the difference of two pump devices. Meanwhile, three groups of pressure monitoring points were set at different positions of the pump device to collect pressure information and pressure pulsation was analyzed. The results show that, the highest efficiency of the shaft front and rear positioned pump device are 81.78% and 80.26%, respectively. The hydraulic performance of the two inlet passages is excellent, and the hydraulic loss is close to each other. Therefore, the hydraulic performance of the pump device depends mainly on the hydraulic performance of the outlet passage. The shaft is set in the outlet passage, which will increase the hydraulic loss and reduce efficiency. Under design conditions, the pressure pulsation amplitude at the impeller inlet is the largest, and the pressure pulsation amplitude increases from the hub to the shroud. The pressure pulsation amplitude of the shaft rear-positioned pump device is larger than that of the shaft front-positioned pump device. The pressure pulsation at the impeller inlet and outlet is greatly affected by the number of blades, and the main frequency is three times the RF. This study can provide practical and effective guidance for the design and optimization of the shaft front-positioned and rear-positioned tubular pump devices, which has theoretical value and application value.

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Section: Turbulence Modelmentioning

confidence: 99%

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

Lü

Liu

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…Zawistowski et al. 10 developed a user-defined function to calculate pressure, velocity, and evaluate the fluid flow. Kumar et al.…”

Section: Introductionmentioning

confidence: 99%

Prediction on the lubrication and leakage performance of the piston–cylinder interface for axial piston pumps

Wang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hydraulic piston pump has the advantages of high efficiency and low-pressure pulsation and has been widely used in the field of construction and agriculture machinery. However, the oil leakage problem, especially the internal leakage of the piston, seriously affects the efficiency of the pump and causes unstable state and high noise. First of all, to improve the performance of the hydraulic pump, a nonlinear mathematical model of the Reynolds equation and energy equation was established to predict the oil film thickness and pressure distribution. What's more, the influence of multiple parameters such as pressure, temperature, swash plate angle, leakage clearance, and the length of leakage flow path on the internal leakage of the piston–cylinder interface was explored. Last but not the least, a test rig was built to measure the corresponding values and to evaluate the effectiveness of the mathematic model. Simulations and experiments consider the variables such as pressure, temperature, and swash plate angle. Both results show that the nonlinear mathematical model could predict the piston pair leakage accurately, so it could be an effective way to improve the design of the piston–cylinder surface structure, gaining higher efficiency.

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“…Through numerical simulation, a precise assessment of the flow parameters can be obtained. Zawistowski and Kleiber 2 presented various approaches to analyse gap flow both in traditional axial piston pumps and novel types of hydraulic pumps. Because of the large aspect ratio between the height of the gap and the size of pump elements, for which Zawistowski presented a numerical simulation approach based on a local model to define a lubrication gap, the numerical analysis of flow in gaps of different configurations revealed the practical advantage of applying a numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Research on lubrication mechanism with fluid–solid coupling of port plate pair in swash plate axial piston pump

Wang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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When a swash plate axial piston pump operates under high-pressure conditions, the valve plate will undergo warping deformation. Based on the theory of elastic fluid dynamic lubrication, this work establishes a fluid–solid coupling model of a swash plate axial piston pump and solves the governing equations of the lubrication with respect to the port plate pair. Cylinder speed, cylinder angle, fluid viscosity, oil film thickness, seal belt width, and structural parameters are also considered to observe their influence on the valve plate warpage deformation with the swash plate axial piston pump. The results show that the deformation cloud of the valve plate on the axial piston pump is symmetrical, with the axis line of the waist groove as the axis. The deformation of the outer seal zone on the high-pressure side of the valve plate is the largest, and the deformation of the outer seal zone on the low-pressure side of the valve plate is the smallest. Under the same conditions, the material and structure of the valve plate affect the thickness and shape of the oil film. This study provides a theoretical basis for the high pressure of the swash plate axial piston pump.

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Gap Flow Simulation Methods in High Pressure Variable Displacement Axial Piston Pumps

Cited by 9 publications

References 10 publications

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

Prediction on the lubrication and leakage performance of the piston–cylinder interface for axial piston pumps

Research on lubrication mechanism with fluid–solid coupling of port plate pair in swash plate axial piston pump

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