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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
  • 53 Downloads

Abstract

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.

Keywords

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

List of symbols

Ad

Flow area of the discharge port

Al3

Flow area of the leakage flow through distributing window

Ap

Flow area of the outlet port in the pump

Ar

Flow area of the throttle valve

B

Width of sealing belt

Cd

Flow coefficient of the discharge port

Cr

Flow coefficient of the throttle valve

Cl3

Flow coefficient of leakage flow through distributing window

Cp

Flow coefficient of the outlet port in pump

D

Diameter of the piston

d

Diameter of the piston rod

dH

Hydraulic diameter

Fh

Hydrostatic force of the piston

h

Stroke of the piston

hq

Instantaneous displacement of the piston

Ke

Bulk modulus

L

Axial length of the piston

L0

Thickness of the concentric ring

L1

Axial clearance between the two piston chambers

L2

Axial length of the distributing window

n

Rotational speed of the pump

P

Pressure of the fluid

p0

Ambient pressure

pq

Pressure in the piston chamber

ph

Pressure in the discharge port

pt

Pressure of the tank

p

Differential pressure between the two piston chambers

p1

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

Σq

Variation of flow

qd

Actual flow

ql

Leakage flow

ql1

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

ql2

Leakage flow through the gap between the cylinder and the piston

ql3

Leakage flow through the distributing window

qi

Discharge flow of the pump unit i

Qp

Discharge flow of the pump

Re

Reynolds number

R

Radius of the piston

S

Cross-sectional area of the piston

t

Time

t0

Time when the flow rate changes

V

Displacement of the 2D pump

Vq

Instantaneous volume of the piston chamber

Vt

Instantaneous volume of the discharge chamber

υ1, υ11, υ12

Axial speed of the piston

δ

Gap between the cylinder and the piston

μ

Fluid viscosity

Notes

Acknowledgements

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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