Papers by Keyword: Cylinder Liner

Abstract: Using ammonium persulfate as an oxidant and nano-silica as dispersing medium,o-toluidine was oxidized to form a core-shell structure poly (o-toluidine)/nano-SiO₂ particle. Investigation of particle yield by ICP-AES method, the adhesion method was used to study the adhesion between coating and cylinder liner. The cavitation resistance of the coating cylinder was studied by the vibration gas cavitation method. The results showed that poly(o-toluidine) was uniformly coated around the nano-silica particles to which forms stable poly (o-toluidine)/nano-SiO₂ with core-shell structure, when m(SiO₂):m(POT)=1:8，n((NH₄)₂S₂O₃):n(POT)=1:1,and the temperature was controlled from 10 to 15°C, the composite poly(o-toluidine)/nano-SiO₂ particles were prepared and the yield reached 85%. Composite poly(o-toluidine)/nano-SiO₂ particles as a functional component and epoxy resin as a film-forming agent were used to prepare composite poly(o-toluidine)/nano-SiO₂/epoxy resin coated cylinder liner with good cavitation resistance, t₁₀₀=885min.

Abstract: One of the key parameter in evaluation of cylindrical surface quality of the engine liners is surface roughness. A large number of process factors affecting a final surface topography, which has direct impact on fuel consumption and CO₂ emission. A suitable choice of honing conditions can results not only to better surface quality, but it can contributes to reducing of environmental impacts in automobile transport. Twelve different engine cylinder liners were machined in various combinations of cutting parameters. Experimental testing was realised on real production machine tool, where process factors were cutting speed, machining allowance and stone pressure of honing tool. All factors have 4 levels and parameters of surface roughness CR, CF, CL were selected as a variables and suitable indicators for surface quality assessment. The results show that influence of the tool stone pressure on honed surface is more significant than effect of cutting speed. Effect of machining allowance is negligible as well.

Abstract: To predict accurately the stress and deformation of combustion chamber components of large slow speed two stroke marine diesel engines, based on AVL Fire and ANSYS Workbench software, multi-field coupling modeling and analysis technology was employed to carry out the strength analysis for combustion chamber components of crosshead type marine diesel engine. The boundary conditions, i.e., the temperature field distribution, the mean temperature and the mean heat transfer coefficient are obtained firstly. Then the strength analysis for cylinder liner of crosshead type marine diesel engine under the thermal loads, mechanical loads and thermal mechanical coupled loads was conducted. The results show that the strength meets the design requirement and the stress concentration and the deformation of the cylinder liner were mainly dependent on the thermal load.

Abstract: The temperature field of cylinder liner directly affects the working process of the engine cylinder. Its research is an important research direction of the engine research. We analysis the location relationship between the cylinder liner and cooperate with the components analysis in this paper. Then the finite element model of cylinder liner component is established and boundary conditions such as gas convective heat transfer coefficient, the piston top heat transfer coefficient are analyzed. A certain type of engine cylinder liner is calculated by using ANSYS temperature field equation solvers. The model and the calculation method this article uses are of great significance for the temperature field research of other heat transfer components.

Abstract: The measurement of deformation of one diesel engine water cooling cylinder liner under free condition and assembly load case is carried out by V-INCOMETER testing system. The basic principles of radial deformation for this cylinder liner are obtained through the test data Fourier transformation. And the affect principles of cylinder liner original distort, which results from mechanical machining and heat treatment process, to the cylinder liner assembly deformation are carried out.

Abstract: The Cylinder liner is one of the working environment of the worst parts in internal combustion engine ,it is required to have good wear resistance, corrosion resistance, resistance to high temperature and high pressure shock, etc. After tests showed, better comprehensive mechanical properties of cylinder liner is got by using Plasma Spray composite ceramic nanometer coating technology, and after laser remelting treatment.

Abstract: This paper constructs a three-dimensional transient hydrodynamic lubrication model for cylinder liner-piston ring based on the three-dimensional transient average Reynolds equation and asperity contact model. A computer program was written with FORTRAN to calculate hydrodynamic lubrication, in which the surface roughness, the variable viscosity effect and the deformation of the circumferential direction of the cylinder liner are taken into account. The film pressure distribution in different crank angle during the stroke, minimum film thickness and friction are computed and analyzed with this program. This three-dimensional transient hydrodynamic lubrication model provides a design basis for the friction analysis of cylinder liner-piston ring.

Abstract: For the commonly used wet cylinder liner assembly characteristics and structure of water-cooled internal combustion engine, the influencing factors of wet cylinder liner deformation in the assembly conditions are calculated and analyzed using finite element method. Mainly from the matching stiffness of block-cylinder liner-gasket-cylinder head assembly, the local stiffness of the cylinder head, cylinder head bolt preload and the structure form of cylinder liner, get the influence laws of the various factors on the cylinder liner radial deformation and its each order Fourier series deformation, which provides guidance direction to control the cylinder liner deformation under assembly loading.

Abstract: The Cylinder liner is one of the key components of diesel engine. Combustion chamber set is constituted by Piston, Cylinder head, Cylinder liner and other parts. Its structure and working environment is complex. Received the gas pressure, friction force from high-speed reciprocating motion of the piston and lateral force of the piston, it results in mechanical stress and mechanical deformation. High temperature combustion and high pressure gas make the piston temperature distribution uneven, which results in piston thermal stress and thermal deformation. Therefore, the element analysis of Cylinder liner in the heat load and mechanical load is significant, the finite element analysis shows the deformation and the stress distribution of the Cylinder liner. It is meaningful for improving Cylinder liner design and reliability.

Abstract: MAN Diesel’s 6S50MC-C disel is a two-stroke marine diesel engine. As the boundary conditions of temperature field distribution, the mean temperature and mean heat transfer coefficient are calculated firstly. The coupled heat transfer of piston crown, piston rings and cylinder liner are analyzed. The steady temperature field and the transient heat transfer under starting condition of diesel engine are obtained in ANSYS. Maximum temperature is 413.55°C in the top surface edge of the piston crown. 59.5% of the total heat from high-temperature fuel gas heat is absorbed by the cooling oil. The temperature of piston crown is effectively reduced by shaker cooling. The load of diesel engine should be increased slowly to prevent stress concentration. To reduce the destructive effect, enhancing cooling and warming up the main engine are requested.