Aircraft personal ventilation: a CFD thermal comfort analysis 2019-01-1347
Nowadays many different researches are occurring to develop a personal ventilation system in aircrafts. A numerical CFD study is presented in order to find the relationship between the initial jet temperature and mass flow to the local thermal comfort on the head, chest and face. Typical regional airplane geometry was used with two passengers seated. The passengers were modeled with mannequins with body and arms. First, it was studied if the personal ventilation jet has influence on only one passenger or if affects the others. It was found that the proposed personal ventilation outlet can influence the local thermal comfort with minimum influence on the others. It was found good correlation on the experimental and numerical central jet velocity. As the jet was well modeled, it was calculated the equivalent temperatures on the head, chest and face with different initial jet temperatures. It was found that the three body parts presents different dependence on the initial jet temperature do to the different distances of the personal ventilation outlet and thermal cloth resistances. Lower temperatures can cause a higher discomfort than higher temperatures. The respective limits were 19 oC and 50 oC for the initial jet temperature for a outlet mass flow of 0,0047 kg/s.