Study of flow ripple characteristics in an innovative two-dimensional fuel piston pump

  • Shengnan Shentu
  • Jian RuanEmail author
  • Jiayuan Qian
  • Bin Meng
  • Lingfeng Wang
  • Shuaishuai Guo
Technical Paper


To meet the requirements of fuel pumps with high efficiency, high power density, and low flow ripple for modern advanced aircraft, we hereby propose a two-dimensional piston pump (called 2D pump). A single piston with both rotary and linear motions is used to combine the flow distributing and volumetric varying functions together. The leakage spots are reduced to the clearance between the piston and the cylinder. As the radial force of the piston is balanced, a small piston clearance is selected to reduce leakage. Furthermore, a 2D tandem pump formed by two 2D pump units connected in series was introduced to eliminate the geometric flow ripple. The flow ripple characteristics were studied through analytical techniques, CFD numerical methods, and experiments. The results show that the flow ripple of 2D pump obtained by the measured pressure wave is 6.3%, while the pump has a high volumetric efficiency of up to 96% within a speed range of 1000–8000 r/min, indicating that reducing the leakage increases the average actual flow and reduces the flow ripple. Therefore, the proposed 2D pump is suitable for modern advanced aircraft.


Two-dimensional pump Fuel piston pump Computational fluid dynamics (CFD) Flow ripple characteristics Volumetric efficiency 

List of symbols


Flow area of the discharge port


Flow area of the leakage flow through distributing window


Flow area of the outlet port in the pump


Flow area of the throttle valve


Width of sealing belt


Flow coefficient of the discharge port


Flow coefficient of the throttle valve


Flow coefficient of leakage flow through distributing window


Flow coefficient of the outlet port in pump


Diameter of the piston


Diameter of the piston rod


Hydraulic diameter


Hydrostatic force of the piston


Stroke of the piston


Instantaneous displacement of the piston


Bulk modulus


Axial length of the piston


Thickness of the concentric ring


Axial clearance between the two piston chambers


Axial length of the distributing window


Rotational speed of the pump


Pressure of the fluid


Ambient pressure


Pressure in the piston chamber


Pressure in the discharge port


Pressure of the tank


Differential pressure between the two piston chambers


Differential pressure between the left and right sides of the outlet port


Variation of flow


Actual flow


Leakage flow


Leakage flow through the gap between the concentric ring and the piston


Leakage flow through the gap between the cylinder and the piston


Leakage flow through the distributing window


Discharge flow of the pump unit i


Discharge flow of the pump


Reynolds number


Radius of the piston


Cross-sectional area of the piston




Time when the flow rate changes


Displacement of the 2D pump


Instantaneous volume of the piston chamber


Instantaneous volume of the discharge chamber

υ1, υ11, υ12

Axial speed of the piston


Gap between the cylinder and the piston


Fluid viscosity



This work was supported by the National Natural Science Foundation of China (51675482).

Author contributions

All authors designed and performed the analysis, numerical simulations, and experiments. The manuscript was written through contributions from all authors. All authors have given approval for the final version of the manuscript.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.


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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.R&D Center of Two-dimensional Hydraulic Components and Systems, College of Mechanical EngineeringZhejiang University of TechnologyHangzhouChina
  2. 2.Beijing Aerospace Technology InstituteBeijingChina

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