Numerical Simulation And Optimization Of Air Distribution In A Commercial Airplane Cockpit During The Rapid Cooling Process

With the development of civil aviation in our country and the improvement ofpeople’s consumption level, more and more people will choose airplane as their mainmeans of transport because of its safety and convenience. Different from otherordinary means of transport, passengers need to stay in a very limited space severalhours long, or dozens of hours on the airplane, so it is particularly important for theenvironment in aircraft to be comfort and healthy. As the important operation platformof aircraft safety flight, the cockpit internal driving environment plays a veryimportant role for drivers’ body healthy, mind clearly, feeling comfortable andoperating correctly. Relative to the cabin, the cockpit is a narrow space with hugeimpact from many electronic heating equipment and solar radiation, so the researchon aircraft cockpit is a very important topic.In hot summer season, if the airplane in the ground stays a long time, strong solarradiation and hot air heat transfer will result in high air temperature in the cockpit.Therefore, before a formal boarding of the passengers the airplane must be to rapidcooling, and cooling method is usually adopted the APU into low temperature cold airto the cockpit. In the process of rapid cooling, the environmental control system in thecockpit can satisfy air temperature in the aircraft cockpit decreased from40~50℃high temperature to the temperature appropriate for cockpit crew through a certainperiod of time. This is my article research content.This topic research, first of all, according to the real model of a certain type ofaircraft cockpit we built the Gambit mesh model which is suitable for the FLUENTsoftware to calculate. We compiled the UDF input program as the cockpit walltemperature boundary which was considering the effect of heat transfer and solarradiation. Then, we calculated the fast cooling process of the cockpit start-up phase inan unsteady numerical simulation, and analyzed the temperature field, velocity field,PMV and PPD in the cockpit environment. It was found that even if the temperatureand speed of the air flow were all meet the requirements of environmental index, thethermal comfort of drivers were still very bad, because the average radiationtemperature was too high in the cockpit. At last, we used orthogonal experimental tofurther study the supply air parameters, air supply angle and solar radiation, with thethermal comfort index (PPD, PD and DR) for comprehensive evaluation. Finally, thisresearch obtained the optimal solution for cockpit air distribution and thermal comfort.