As the auxiliary preheat device for vehicle, vehicle preheater has been widely adopted for vehicle cold starting, preheating and defrosting. The three-dimensional geometric model of preheater is established in this paper. The combustion process of preheater with different structures has been simulated. The simulation results reveal that the proper conical hood diameter could simulate the mixture between fuel and gas apparently and improve preheater combustion efficiency, combustion tube length affects the mixture between fuel and gas, the temperature distribution in the tube as well as also affects the lifetime of preheater, and different fin height has a great influence on the outlet temperature of preheater. Research results contribute to the design and development of preheater, and also put forward the improvement direction of preheater.
Because the tube festivals surface is not round, uneven, so the cutting tool is under impact unceasingly in cutting process. Cutting tool is extremely easy to have fatigue failure, therefore it is very necessary to use finite element numerical analysis software ANSYS to carry on numerical simulation analysis for heavy lathe tool intensity static. The force of cutting tool and distributed rule of definite cutting tool internal stress strain could be precisely got by using FEM, thus the analysis results could improve cutting tool stress condition and the structural design provides the theory basis
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