Analysis of Diesel Engine Main Bearing Lubrication Under Single-Cylinder Misfiring Situation

Liu, Na; Zheng, zhongcai; Li, Guoxiang

doi:10.18280/ijht.330411

Cited by 5 publications

(3 citation statements)

References 13 publications

(13 reference statements)

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“…The journal bearing with axial grooves is extensively used in high-performance diesel engine, gas turbine shafting and fuel pump. In order to improve the performance and service life of the engines, more and more attention has been paid to improving the lubrication performance, a key determinant of engine performance, of the journal bearing with axial grooves [1][2]. With the development of surface etching and laser technique in recent years, the micro dimples have been applied to increase the load-carrying capacity of modern machine components thanks to its secondary lubrication and micro-hydrodynamic effects.…”

Section: Introductionmentioning

confidence: 99%

Optimal surface texture design of journal bearing with axial grooves

Guo¹

2017

IJHT

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This paper conducts a numerical investigation of the effects of micro spherical and cylindrical dimples on the load-carrying capacity of the journal bearing with axial grooves, aiming to obtain the best lubrication performance. In order to analyze the lubrication performance, the mass conservative JFO (Jakobsson, Floberg, Olsson) cavitation boundary condition is adopted to address the oil film rupture and reformulation, and the Reynolds equation is used to build the hydrodynamic lubrication model for the dimple-textured journal bearing with axial grooves. On this basis, the author examines how the shape, location and geometric parameters of the dimples influence the load-carrying capacity at various eccentricities. The results show that the dimples can significantly improve the load-carrying capacity of the bearing, especially when the dimples are textured on bearing pad 3, and that the maximum load-carrying capacity can be obtained with micro cylindrical dimples of area ratio s=0.5, maximum depth hd=300 μm, circumferential number m3= 6, and axial number n3= 4.

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Section: Introductionmentioning

confidence: 99%

Optimal surface texture design of journal bearing with axial grooves

Guo¹

2017

IJHT

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“…In recent years, global energy crises and environmental concerns have prompted automotive engine manufacturers to provide high energy efficiency of the internal combustion engine [1]. Changing the design of the internal combustion engine components to improve combustion efficiency is considered to be an effectual measure [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Different Types of Flow Field and Engine Performance of the Vortex Throttle

Yang¹,

Dong²,

Meng³

et al. 2016

IJHT

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In this paper, the vortex throttle model and the conventional throttle model were established and compared. Both the throttles' air flow within the model were simulated. Air flow velocity and flow were compared. The results show that, through the forming of a swirling motion of the air, the vortex throttle's air flow velocity and flow rate were increased at each same degree of valve opening. The vortex throttle's turbulent kinetic energy also helps the entry of air, thereby increasing the amount of air entering the engine. On this basis, engine performance tests were carried out on two engines installed with each type of throttle. Performance test results show that, under the same power and torque output, the economy of the engine was enhanced by the vortex throttle. The results of simulation analysis and performance tests show that the vortex throttle created a swirling motion, which increases the amount of intake air to improve engine performance.

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“…Biogas is a combustible gas which can be generated through the microbial fermentation of organic matter under anaerobic conditions [1]. It can be obtained by various methods.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Gas Flow and Combustion in Biogas Generators

Yang¹,

Dong²,

Yang³

et al. 2016

IJHT

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Biogas is an environmentally friendly and clean, pollution-free fuel. In this paper, biogas generators have been researched in order to study the use of pig farm biogas in China. First, the pig farm biogas components are grouped, tested, and formulated. Since the biogas combustion process is not the same as for gasoline, biogas processing is carried out in a constant volume bomb combustion test, thus, the different components of biogas combustion speed, combustion pressure, and other information become available. The biogas combustion process in the combustion chamber and movement are simulated, and the cylinder pressure, speed, and temperature conditions are obtained. As can be seen from the experimental results, the biogas combustion speed is lower than that of gasoline, the ignition timing generator needs to be adjusted. In order to reduce the possibility of post-combustion occurring in the combustion chamber, certain combustion chamber swirl movements should be organized. The results show that by adjusting the ignition timing, air movement, and other factors, biogas can be used as fuel in generators.

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Analysis of Diesel Engine Main Bearing Lubrication Under Single-Cylinder Misfiring Situation

Cited by 5 publications

References 13 publications

Optimal surface texture design of journal bearing with axial grooves

Optimal surface texture design of journal bearing with axial grooves

Different Types of Flow Field and Engine Performance of the Vortex Throttle

Experimental Study of Gas Flow and Combustion in Biogas Generators

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