Numerical Analysis on Airflow and Thermal Field in Quiet Power Vehicle Compartment

Click here and insert your abstract text. A numerical simulation of the airflow and thermal field for a quiet power vehicle (QPV) compartment was presented in order to regulate the airflow and dissipation. A general three-dimension computational fluid dynamics (CFD) model, based on the Navier-Stokes equations and Realizable k−ɛ turbulence model, was applied to study the airflow and heat dissipation in the QPV compartment. The airflow fields and pathlines of the airflow in the QPV compartment, the temperature fields of generator sets and diesel exhaust mufflers were calculated. The simulation results showed that the airflow moved fast and intensively at the place that was close to diesel generator radiator fan, which was useful for improving cooling effect of the generator sets and radiator; the temperature of generator sets and mufflers was relatively high, which would be beyond to 80°C, and an axial fan was designed on the gen-set chamber wall to improve its ventilation for cooling, the results showed the temperature dropped about 2°C-8°C. Moreover, experiments were conducted to measure the temperatures referring to some testing standards for QPV, and comparable results were obtained between the simulation and measurements, which showed that the addition of the axial fan was reasonable.