The Research Of Aircraft Cabin Air Comfort Based On Numerical Simulation

In 2011, the CAA(civil aviation administration)requires airports in the stage of the pre-flight, post-flight and stops, promoting the use of bridge equipment replacement of the APU gradually. Bridge-borne air conditioning refers to an air conditioning system that is suspended at the bottom of the lounge bridge. Nitrogen dioxide pollution is currently a popular research topic. Aircraft passengers and crew could be exposed to nitrogen dioxide, which has potential health hazards, particularly when the plane is using bridge-borne air conditioning at the airport. Problems are mainly concentrated in the following two aspects: thermal comfort issues; the optimal energy issues under thermal comfort.The paper, mainly, studies the influence of the cabin air comfort when using bride-load air conditioning. Furthermore, it obtains the optimal supply air speed of the bridge-load air conditioning under the numerical simulation results in this paper, which provides the basis for the control of the bridge-load air conditioning in the future. Research method is computational fluid dynamics technique, the air comfort evaluation index inside the aircraft cabin is air diffusion performance index and the concentration of NO2. The main work includes introduces on the theoretical basis of computational fluid dynamics, describing on the simulation needed to be done before work, carrying out numerical simulation on the cabin model, the numerical results obtained by the analysis and processing, finally giving suggestions for bridge-load air conditioning control.The research achievements of this paper include two aspects: the establishment of a relatively close to the actual cabin model and quantitative research on how the supply air velocity of bridge-load air conditioning affects the cabin air comfort. While modeling the aircraft cabin, it established the actual shape size of airplane cabin according to Boeing 737, and build the real connection form of the gas pipeline in the aircraft between the bridge-load air conditioning, it also established the outflow returning system, which is as closely to the way of the actual situation, so as to ensure the accuracy of the simulation results. Through analysis of simulation results, it found that whether the air supply speed of the bridge-load is greater or smaller, the thermal comfort inside the cabin will both reduce. The NO2 concentration inside the cabin is increasing when the air supply speed is stronger. So the influence of supply air speed of the bridge-load to the cabin comfort is an optimization problem. Finally, the article got the optimal supply air speed under the simulation case in the paper by establishing a target evaluation function. The conclusion of the paper can offer advisory guidance for the future bridge-load air conditioning.