تامین شرایط آسایش حرارتی خلبان داخل کابین یک بالگرد صحرائی

چکیده مقاله

In this paper, forced turbulent convection flow and heat transfer of air in a desert helicopter cabin is studied. The main aim of this study is providing human thermal comfort for a desert helicopter pilot in summer (usage of cooling system). In order to fulfill this demand, a body subdomain was considered around the pilot that includes the pilot's using area in cabin. The governing equations are numerically solved by the control volume approach based on the SIMPLE technique and standard k-ε turbulent method. The effects of different supply air performances (velocity and temperature) on pilot thermal comfort parameters are presented. Then, the optimization was carried out to reach the optimal case with the minimum predicted percentage dissatisfied (PPD). According to results, temperature and velocity of supply air have a remarkable influence on air temperature and velocity of pilot's body subdomain and consequently on thermal comfort characteristics. It was understood that the air temperature and air velocity in pilot's body subdomain reduces and increases respectively, by increasing supply air velocity. Finally, the predicted mean vote (PMV) and PPD indexes were calculated for different supply air performances. Based on results, the minimum PPD was obtained for the case with supply air temperature and velocity of Tin=10 oC and Vin=0.4 m/s, respectively.