Research On Thermal Comfort For Non-uniform Environment In Aircraft Cabin

Reasonable design of cabin ventilation system is not only of great significance to create a healthy and comfortable cabin environment,but also plays an important role in energy saving and emission reduction.The airflow distribution in a two-channel wide-body airliner is simulated by CFD.Air quality,energy saving potential and thermal comfort are analyzed.The main contents and results of this thesis are as follows:(1)The thermal comfort model in non-uniform cabin environment is studied,which includes thermal sensation model and human thermoregulation model.The results show that the prediction accuracy of the local thermal sensation model I is higher,and the prediction accuracies are 86.7% and 81.3% in the indoor environment and cabin environment,respectively.The prediction accuracies of overall thermal sensation model in the indoor environment and cabin environment are both 100%.(2)According to the physiological characteristics of the Chinese and the environmental characteristics of the aircraft cabin,the controlled system of the thermoregulation model is optimized.The results show that: after optimization according to the physiological characteristics of Chinese,the maximum prediction deviation of average skin temperature decreases from 0.67? to 0.39?,the maximum prediction deviation of core temperature decreases from 0.3? to 0.1?,and the prediction accuracy of local skin temperature increases from 85.4% to 93.8%.The model can accurately predict skin temperature and core temperature according to the characteristics of cabin low pressure environment.(3)The numerical simulation results of mixing ventilation and displacement ventilation system in cabin show that: the displacement ventilation system has greater energy saving potential and pollution discharge efficiency,better air quality and less difference in overall thermal sensation of passengers in different seats.While the displacement ventilation system easily causes temperature stratification,and the vertical temperature difference is more than 4?.(4)The hybrid ventilation system is studied by orthogonal experiment method and CFD.It is found that hybrid ventilation system can overcome the weakness of the large vertical temperature difference in displacement ventilation system,and the weakness of poor air quality in mixing ventilation system.Moreover,it still has high energy saving potential,great pollution discharge efficiency and low draft sensation.And the thermal sensation of passengers on different seats is almost the same under hybrid ventilation system.Therefore,the hybrid ventilation system can create a healthy,comfortable and energy-saving cabin environment for two-channel wide-body aircraft.