Optimal Designing of Heavy Duty Vehicle Preheater System

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. Keywords-vehicle preheater; preheater efficienc; flows field