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Research Papers: Hydrodynamic Lubrication

# A Nonisothermal Fluid-Structure Interaction Analysis on the Piston/Cylinder Interface Leakage of High-Pressure Fuel Pump

[+] Author and Article Information
Dexing Qian

School of Mechanical Engineering,
Beijing Institute of Technology,
5 South Zhongguancun Street,
Haidian District,
Beijing 100081, China
e-mail: dexing.qian@gmail.com

Ridong Liao

School of Mechanical Engineering,
Beijing Institute of Technology,
5 South Zhongguancun Street,
Haidian District,
Beijing 100081, China
e-mail: liaord@bit.edu.cn

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 18, 2013; final manuscript received January 7, 2014; published online February 19, 2014. Assoc. Editor: Luis San Andres.

J. Tribol 136(2), 021704 (Feb 19, 2014) (8 pages) Paper No: TRIB-13-1085; doi: 10.1115/1.4026501 History: Received April 18, 2013; Revised January 07, 2014

## Abstract

In this paper, a nonisothermal fluid-structure interaction mathematical model for the piston/cylinder interface leakage is presented. Full account is taken of the piston eccentricity, elastic deformations of the piston pair, the nonisothermal flow in the interface, and the physical properties of the fluid such as the pressure-viscosity and temperature-viscosity effects. The numerical method for the solution of the model is given, which can simultaneously solve for the fluid pressure distribution and leakage rate in the interface. The model is validated by comparing the calculated leakage rates with the measurements. Results show the good accuracy of the model. The impacts of parameters such as the piston diameter, the initial clearance between the piston pair, and the piston velocity on the leakage rate are discussed. Some of the conclusions provide good guidance for the design of high-pressure fuel pumps.

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## References

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## Figures

Fig. 1

Fig. 2

Schematic of the piston/cylinder interface

Fig. 3

Piston position in the cylinder

Fig. 4

Flow chart of the solution steps

Fig. 5

Piston lift and velocity versus camshaft angle

Fig. 6

Calculated and measured piston/cylinder interface leakage rates versus sealing length

Fig. 7

Piston/cylinder interface fluid pressure distributions in the axial direction (L = 25 mm)

Fig. 8

Leakage rate versus piston diameter (L = 25 mm)

Fig. 9

Leakage rate versus initial clearance (L = 25 mm)

Fig. 10

Leakage rate versus sealing length at different camshaft speeds (nonisothermal FSI model)

## Errata

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