Numerical Simulation and Experimental Verification of Flow Pulsation and Outlet Pressure of Roller Piston Pump

doi:10.3969/j.issn.1004-132X.2026.02.006

Abstract

Abstract:

In order to study the flow pulsation and outlet pressure characteristics of the roller piston pump， a CFD numerical simulation model was established based on the motion law and structure of the pump， and its internal flow field and pressure field were analyzed in detail through CFD numerical simulation. The results show that the pressure and flow changes inside the plunger working chamber indicate that there is no structural flow pulsation in the pump， but when the suction and discharge chambers and the distribution window were switched， flow backflow occurs due to the pressure difference. Theoretical analysis show that under the conditions of 3000 r/min and 5 MPa， the flow pulsation and pressure pulsation are as 23.4% and 9.8% respectively. Finally， the outlet pressure of the roller piston pump was tested by building a special test bench for outlet pressure testing. Experimental data show that the pressure pulsation value of the pump under this working condition is as 11.25%， and the CFD simulation result is as 9.8%. The experimental results were consistent with the CFD numerical simulation results， which verified the accuracy of the CFD numerical simulation and provided guidance for the subsequent reduction of pulsation.

Key words: roller piston pump, flow pulsation, outlet pressure, computational fluid dynamics（CFD）, numerical simulation

摘要：

为研究滚子柱塞泵的流量脉动及出口压力特性，基于泵的运动规律和结构建立了计算流体动力学（CFD）数值模拟模型，并通过CFD数值模拟对其内部流场和压力场进行了详细分析。柱塞工作腔内部的压力和流量变化表明该泵不存在结构性流量脉动，但在吸排油腔与配流窗口切换时，由于压力差会发生流量倒灌。理论分析结果表明，在转速为3000 r/min、压力为5 MPa的条件下，流量脉动和压力脉动分别为23.4%和9.8%。最后，通过搭建出口压力测试专用实验台对滚子柱塞泵的出口压力进行了测试，实验数据显示该工况下泵的压力脉动值为11.25%，CFD模拟结果为9.8%。实验结果与CFD数值模拟结果吻合较好，验证了CFD数值模拟的准确性，并为后续减小流量脉动提供了参考。

关键词: 滚子柱塞泵, 流量脉动, 出口压力, 计算流体动力学, 数值模拟

CLC Number:

TH137.52

ZHANG Chenchen, RUAN Jian, LI Sheng. Numerical Simulation and Experimental Verification of Flow Pulsation and Outlet Pressure of Roller Piston Pump[J]. China Mechanical Engineering, 2026, 37(2): 304-314.

张晨晨, 阮健, 李胜. 滚子柱塞泵的流量脉动与出口压力的数值模拟及实验验证[J]. 中国机械工程, 2026, 37(2): 304-314.

Figures/Tables 22

Fig.1 Structure schematic diagram of the roller piston pump

Fig.2 Piston A

Fig.3 Movement law of piston A

Fig.4 Output flow of piston A and piston B

Fig.5 Simulation model of roller piston pump

Fig.6 Mesh model of the roller piston pump fluid domain

Fig.7 Grid settings for oil pipelines

Fig.8 Piston cavity unit mesh boundary settings

Fig.9 Overall mesh model of roller piston pump

Tab.1 Simulation parameters

设置	参数名	类型	数值
物理性质	油液	密度/（kg·m $- 3$ ）	840
		动力黏度/（kg·m $- 3$ ·s $- 1$ ）	0.011
		弹性模量/Pa	10⁹
边界条件	压力进口	Pressure-inlet/MPa	0.4
边界条件	压力出口	Pressure-outlet/MPa	5
计算模型	湍流模型	RNG k-ε模型

Tab.1 Simulation parameters

设置	参数名	类型	数值
物理性质	油液	密度/（kg·m $- 3$ ）	840
		动力黏度/（kg·m $- 3$ ·s $- 1$ ）	0.011
		弹性模量/Pa	10⁹
边界条件	压力进口	Pressure-inlet/MPa	0.4
边界条件	压力出口	Pressure-outlet/MPa	5
计算模型	湍流模型	RNG k-ε模型

Fig.10 Boundary condition settings for two pump units

Fig.11 Speed vector diagram of roller piston pump at different rotation angles

Fig.12 Pressure changes in the left chamber of piston A

Fig.13 Flow changes in the left chamber of piston A

Fig.14 Pressure changes in the working chambers of pistons A and B and the pump

Fig.15 Pressure distribution of roller piston pump at different rotation angles

Fig.16 Working chambers of pistons A and B and pressure changes after superposition

Fig.17 Pressure and flow curve of roller piston pump at 3000 r/min， 5 MPa

Fig.18 Experimental prototype

Fig.19 Outlet pressure test bench

Fig.20 Original signal and filtered signal

Fig.21 Pressure fluctuation curve of roller piston pump at 3000 r/min， 5 MPa

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