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

Qian, Dexing; Liao, Ridong

doi:10.1115/1.4026501

Cited by 20 publications

(10 citation statements)

References 7 publications

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“…The unified model for the properties of the fuel (ISO 4113 Oil) proposed in the previous research would be used here. 2 …”

Section: Materials and Modelsmentioning

confidence: 99%

“…The complex phenomena that take place at the interface were described in a previous study. 2 Most conventional leakage models 2–6 are based on the one-dimensional elastohydrodynamic lubrication (EHL) theory, which draws from the simplified Navier–Stokes equations, and linear elastic equations. However, the one-dimensional model cannot simulate the complex structure of the piston/cylinder well.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal fluid–structure interaction analysis on the piston/cylinder interface leakage of a high-pressure fuel pump for diesel engines

Qian

Liao

Xiang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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Leakage at the piston/cylinder interface of a high-pressure fuel pump for diesel engines becomes more severe due to the increase in delivery pressure. Therefore, a thermal fluid–structure interaction model that can simulate the complex phenomena that take place at the interface is presented in this paper. In the model, the nonisothermal flow, the physical properties of the fluid such as dynamic viscosity and density versus pressure and temperature relationships, the coupled heat transfer between the fluid and structure as well as thermal and pressure-induced elastic deformations of the structure are considered. The calculated leakage rates from the model show good agreement with the experimental results. The impacts of pressure-induced and thermal elastic deformations of the structure on the leakage are discussed. A new direction for reducing the interface leakage is proposed.

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“…The unified model for the properties of the fuel (ISO 4113 Oil) proposed in the previous research would be used here. 2 …”

Section: Materials and Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal fluid–structure interaction analysis on the piston/cylinder interface leakage of a high-pressure fuel pump for diesel engines

Qian

Liao

Xiang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, it is crucial to investigate the fuel injector nozzle effect and the mechanism of spray characteristics with different types of fuel. Furthermore, the fuel injector experiences energy loss and leakage under extreme high injection pressure [3]. In another preliminary study, Hussain et al [4] proposed that the elliptic jets of different aspect ratios changed the entrainment and other turbulence phenomena, which is useful in increasing the diesel engine performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Nozzle Flow and Spray Characteristics from Different Nozzles Using Diesel and Biofuel Blends

et al. 2019

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In this paper, the discrete phase model (DPM) was introduced to study the fuel injector cavitations process and the macro spray characteristic of three different types of nozzle spray shape with diesel and hybrid biofuel blend for several injection pressures and backpressures. The three types of nozzle spray shapes used were circle, elliptical A type, and elliptical B type. The cavitations’ flows inside the injector nozzles were simulated with Computer Fluid Dynamics (CFD) simulations using the cavitations mixture approach. The effect of nozzle spray shape towards the spray characteristic of hybrid biofuel blends is analyzed and compared with the standard diesel. Furthermore, a verification and validation from both the experimental results and numerical results are also presented. The nozzle flow simulation results indicated that the fuel type did not affect the cavitation area vastly, but were more dependent on the nozzle spray shape. In addition, the spray width of the elliptical nozzle shape was higher as compared to the circular spray. Moreover, as the backpressure increased, the spray width downstream increased as well. The spray tip penetration for the elliptical nozzle shape was shorter than the circular nozzle shape due to circular nozzles having smaller nozzle widths and lesser spray cone angles. Thus, this resulted in smaller aerodynamic drag.

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“…14 presented a new method for determination of the clearance surface temperature distribution in an axial piston machine and developed a thermal model to consider the energy dissipation in the lubricating clearance. Qian and co-workers 15–17 developed a fluid–structure–thermal model with consideration of changes in temperature for the piston/cylinder interface leakage of a high-pressure fuel pump; however, analysis and comparisons of the effects of different structural parameters on the fuel leakage were not performed.…”

Section: Introductionmentioning

confidence: 99%

The fluid–structure–thermal coupled characteristics of the leakage rate of piston couples interface for common-rail injector

Yue

Zhao

Wei

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this article, a mathematical fluid–structure–thermal model for fuel leakage of piston couples was developed, with consideration of the physical properties of fuel, elastic deformation, and temperature distribution along the seal length. The calculated results were compared with experimental static fuel leakage data. Based on this model, the effects of various factors on the fuel leakage were investigated. The results showed, at pressures under 100 MPa, the most dominant influence on the fuel leakage of a piston couple was the initial clearance; however, as the pressure increased from 100 to 200 MPa, the influence of the initial clearance gradually weakened, while the effects of the piston diameter, elastic modulus, and diameter of the piston sleeve increased and became more significant; in this case, the piston diameter replaced the initial clearance as the most dominant factor. At a pressure range of 200–300 MPa, the effects of the elastic modulus exceeded the effects of the initial clearance and became the second most important factor. Therefore, simply adjusting the initial clearance is not an effective method to reduce fuel leakage. An increase in the seal length significantly influences the fuel leakage only under relatively low-pressure conditions, as the effect weakens with increasing pressure. As a result, under high-pressure conditions, it is necessary to consider both the diameter of the piston and the elastic modulus to reduce the fuel leakage.

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

Cited by 20 publications

References 7 publications

Thermal fluid–structure interaction analysis on the piston/cylinder interface leakage of a high-pressure fuel pump for diesel engines

Thermal fluid–structure interaction analysis on the piston/cylinder interface leakage of a high-pressure fuel pump for diesel engines

Numerical Analysis of Nozzle Flow and Spray Characteristics from Different Nozzles Using Diesel and Biofuel Blends

The fluid–structure–thermal coupled characteristics of the leakage rate of piston couples interface for common-rail injector

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