Numerical simulation on the temperature field of combined-piston for locomotive diesel engines
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Ascertains the heat transfer boundary condition.Building 3-dimensional model of the 16V280ZJA diesel engine piston and calculating the temperature fields of piston under the thermal loads are given applying the PRO/E software.And then,we know the key positions'temperature during the operations.As to engineer and technologist,the temperature values of specific points in piston space is requisite to calculate the thermal deformation and stress fields and provide a reference for further improving the structure and optimizing the design of such a combined-piston.Keywords:
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As the research object to a certain type of diesel engine pistons, a three-dimensional finite element analysis model is established. Piston stress is calculated under the conditions of thermal load, mechanical load and coupled load. Results show that, the main cause of the piston safety, the piston deformation and the great stress is the temperature, so it is feasible to further decrease the piston temperature with structure optimization.
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Mechanical load
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As the most dominative component under stress in an external combustion cam engine, the working condition of piston is very rigor. Once new design type and technical improvement is applied, it is necessary to analysis its thermal load and take secure steps. And the finite element model on each conditions of thermal is calculated, which is used to estimate the temperature field and provide a theoretical basis for further structural strength analysis and optimization design. Choosing analysis results of the piston as reference and taking five structural parameters of the piston as design variables, two objective functions including piston mass and maximal Von Mises stress are respectively considered. The optimum design of the piston is executed and the results indicate that it is feasible to improve temperature field and strength of the piston. These results enrich and develop the research on structural analysis and optimization of spatial engine, which are of guiding significance for analyzing engine strength and related problem in theoretically.
Piston (optics)
Stress field
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The piston is one of the main parts of diesel,so it is an important way of improving the reliability and life of diesel to find the right and reliable calculation methods of piston temperature field.This paper discusses the theoretical base of piston thermal analysis,and builds the threedimensional finite element models of diesel.Then,the three-dimensional temperature field distributing characters of piston have been gotten by calculating its heat transfer coefficient and temperature field adopting empirical formulas.The results show that the method is easy,so it can be used to calculate the piston temperature field.
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The paper is continuation of the part A and presents influence of boundary conditions on mechanical and thermal stresses of an oil cooled piston in diesel engine Scania DC09 074A and its deformation due to high combustion pressure and variable temperature. Calculations of the piston loads were carried out by using 0D mathematical model at assumption of the Vibe combustion model and the Woschni heat transfer model for homogenous mixture. For precise determination of the gas temperature in the combustion chamber the CFD technique was used and for that case the simulation of compression, combustion and expansion processes was carried out by using the program Fluent. The numerical calculations were done for two kinds of fuel: diesel oil and CNG. In order to proper work of CNG engine the compression ratio was decreased. This was done by reducing the volume of the combustion chamber. Calculations done in the program Ansys showed that the modification of the piston do not influence significantly on the total stresses. The paper shows the differences of the total stresses and piston deformation at fastened piston hub and at "floating" piston pin. Most calculations are taken that the piston hubs are fixed, but it is not right assumption. In summary the paper gives indications how to set boundary conditions for "floating" piston pin. Due to different fixing of the pin in the piston hub the deformation of the piston shape and von Misses stresses differ at the same boundary conditions The analysis has shown that FEM calculations of the piston should be done together with the pin for giving the engineers right information how to design the piston shape, usually "barrel-oval", in order to enable a proper clearance between the piston and cylinder walls at high loads.
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Using MSC NASTRAN software and combining the heat transfer boundary conditions of piston,in a new diesel engine example,the temperature field of a diesel engine steel piston was calculated. The piston was compared with traditional aluminum piston. The result shows that the steel piston structure is feasible.
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An effective scheme is presented for calculating the thermal boundary condition of the piston set of 4105 diesel engine. By using the COSMOS/M software, 3-D finite element analysis of the temperature field and heat transfer in the piston set under thermal loading is carried out. The thermal deformation and clearance change are calculated as well. The results are beneficial to the improvement of the design of piston set.
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In this paper, we use the finite element analysis software ANSYS to built a three dimension solid model of the piston in natural gas engine and make the digital simulation of the piston’s temperature field. By the actual measurement of indicator diagram, we calculate working process in the cylinder and heat transfer boundary condition of the piston and simulate it’s temperature field. Compared with the actual measurement of temperature distribution, we find that the research results provide theoretical basis to improve heating conditions of the piston, and will be significant to computer-aided calculation of the piston simultaneously. Analysis results show that the simulated results consistent with the actual situation. So the FEM (finite-element method) can actually reflect the temperature distribution of piston.
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In order to meet with the high power and density of engine development,a new style steel piston was set up.This paper described the heat transfer boundary conditions of steel piston and used MSC.NASTRAN software to calculate the temperature field of the steel piston.Weight of traditional aluminum piston was compared,which provided some references for the structural analysis and improvement of steel piston.
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The theoretical bases of the thermal analysis of engine piston is stated and a 3-dimesional finite element model of the piston is build up.The thermal field of the piston model is calculated with the finite element analysis software.The distribution condition of the 3-dimesional thermal field is determined,which provides some important supports for the structure design and optimization of the piston.
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Adopting the finite element software ANSYS, this paper calculates the temperature and stress fields of the combined piston under the conditions of cooling and no cooling. The analytical results show that the piston under no cooling condition has higher thermal load and integrative stress than the condition of cooling, because the piston head can’t get better cooling. Moreover, the high thermal load causes the piston head creating great deformation, which has exceeded the normal gap between the piston and the liner, so the piston abrasion may worsen.
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