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

Qian, Dexing; Liao, Ridong; Xiang, Jianhua; Sun, Baigang; Wang, Shangyong

doi:10.1177/1350650116679266

Cited by 20 publications

(11 citation statements)

References 7 publications

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“…Li and Jiao (2006) used energy conservation theory to establish a coupled lubrication model, providing a detailed analysis of heat transfer within the structure. Qian et al (2017) developed a lubrication model for the lubrication gap, considering the interaction between thermal fluid and structure, as well as the variation of lubricant properties with temperature and pressure. However, their investigation assumed a smooth surface.…”

Section: Introductionmentioning

confidence: 99%

Lubricating characteristics and sealing performance of mixed TEHD analysis of piston-cylinder interface in the piston pump

Yan

Huang

2023

ILT

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Purpose In high-pressure pumps, due to the interaction of asperities on the upper and lower surfaces, the piston–cylinder interface suffers severe lubrication and sealing problems during mixed lubrication. This study aims to establish a mixed thermo-elastohydrodynamic (EHD) model for the lubrication gap to determine how working conditions affect the lubricating characteristics and sealing performance of the interface. Design/methodology/approach A mixed thermo-EHD lubrication model is established to investigate the lubricating characteristics and sealing performance of the interface between the piston and cylinder. The model considers piston tilting, thermal effect, surface roughness and bushing deformation. The interface lubricating characteristics and sealing performance under different working conditions are calculated by the proposed numerical model. Findings A higher inlet pressure contributes to an increase in the minimum film thickness. Increased shaft speed can significantly reduce the minimum film thickness, resulting in severe wear. Compared to roughness, the impact of the thermal effect on the interface sealing performance is more significant. Originality/value The proposed lubrication model in this study offers a theoretical framework to evaluate the lubricating characteristics and sealing performance at the lubrication gap. Furthermore, the results provide references for properly selecting piston-cylinder surface processing parameters. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2023-0072/

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Section: Introductionmentioning

confidence: 99%

Lubricating characteristics and sealing performance of mixed TEHD analysis of piston-cylinder interface in the piston pump

Yan

Huang

2023

ILT

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“…10 As the physical properties of fuel are effected by the temperature and pressure of fuel, it is more accurate method to take them into account for the leakage study of the plunger pair. 11,12 Qian et al 13 and Qi 9 considered a nonisothermal fluid-solid coupling model in the leakage study of plunger pair through CFD numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Study on the leakage of plunger pair under static condition in high-pressure common rail injector considering deformation effect

Gao

Yong

Wang

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Plunger pair is the key component of high pressure common rail injector and its sealing performance is very important. Therefore, it is of great significance to study the leakage mechanism of plunger pair. Under static condition, the high-pressure fuel flow in the gap of the plunger pair caused the deformation of the plunger pair structure and the temperature rise of fuel. For a more comprehensive and accurate study, the effect of deformation, including elastic deformation and thermal expansion, the physical properties of fuel, including density, viscosity and specific heat capacity, as well as the influence of plunger posture in the plunger sleeve, including concentric, eccentric, and inclination condition, are considered in this paper. Firstly, the mathematical models including Reynolds equation, film thickness equation, non-isothermal flow equation, parametric equation of fuel physical property, and section velocity equation are established. The numerical analysis based on finite difference method for the solution of these models is given, which can simultaneously solve for the fuel film pressure distribution, temperature distribution, thickness distribution, distribution of fuel physical properties, and leakage rate. The models are validated by comparing the calculated leakage rates with the measurements. The effects under different posture of plunger are discussed too. Some of the conclusions provided good guidance for the design of high-pressure common rail injector.

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“…The efficiency of gear pumps decreases to unacceptable levels at high pressures and temperatures, which are routine operating conditions for modern advanced aeroengines [3]. For axial piston pumps, lubrication of the friction couples, such as cylinder end-to-valve plate, slipper-toswash plate, and piston-to-cylinder, is expected to deteriorate while leakage increases at high pressures and temperatures [4]. Moreover, the axial piston pump bears the disadvantage of heavy weight, when applying in aero-engines.…”

Section: Introductionmentioning

confidence: 99%

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

Shentu

Ruan

Qian

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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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.

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

Cited by 20 publications

References 7 publications

Lubricating characteristics and sealing performance of mixed TEHD analysis of piston-cylinder interface in the piston pump

Lubricating characteristics and sealing performance of mixed TEHD analysis of piston-cylinder interface in the piston pump

Study on the leakage of plunger pair under static condition in high-pressure common rail injector considering deformation effect

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

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