Research On Numerical Simulation Of Air Distribution In Combined Harvester Cab

In this paper, firstly, current situation of the cab flow field research an home and abroad, numerical simulation theory and air distribution evaluation index were introduced what were necessary foundation for the modeling and numerical simulation. Secondly, combined harvester cab as the research object, using RNG k-εtwo equation model, wall function method, considering solar radiation and thermal radiation of body, turbulence model of the cab was established,3-D models were established using Pro/E and meshed using GAMBIT, numerical simulation were carried on in multiple working condition using FLUENT. Finally, the distribution of the temperature field, velocity field on different sections, non-uniform coefficient, ADPI and PMV-PDD index were obtained, the influence of different inlets temperature and velocity in the cab temperature and velocity field were analyzed according to the results.Conclusions:when the inlets temperature increased, the airflow temperature generally elevated and it affected velocity field little; when the inlets velocity increased, the airflow temperature generally dropped. When the inlets temperature changed, the non-uniform coefficient and value of the airflow temperature and velocity changed little. As the inlets velocity increased, the temperature non-uniform coefficient was smaller and the velocity non-uniform coefficient was larger, the temperature value become first bigger, then smaller and the velocity value gradually become smaller. As the inlets temperature and velocity increased, ADPI values of every section become first bigger, then smaller, it was means that too high or too low of the inlets temperature and velocity would lead to low ADPI value.