The Research Of Aircraft Cabin Thermal Environment Simulation Based On IPMV-PPD

In recent years,airplanes have become one of the main modes of transportation for people to travel,promoting the development of domestic and foreign trade,tourism and other activities.The number of passenger planes and annual passenger throughput in China have increased rapidly.Because the airplane cabin is a relatively narrow and complex airtight space,the air circulation is not good,and passengers' activities are inconvenient,people pay more and more attention to the thermal comfort problem in the cabin.At the same time,with the continuous development of air transport industry,aviation oil consumption is very large,and a variety of pollutants are produced,which brings serious environmental pollution and noise problems to the airport and its surrounding areas.Therefore,the CAA(Civil Aviation Administration)vigorously promotes the use of bridge load air conditioning instead of aircraft APU(Auxiliary Power Unit)in airports to reduce aviation fuel consumption and environmental pollution.However,the current bridge load air conditioning is constant speed air supply,which can not meet the thermal comfort and energy saving purposes of the cabin at the same time.In order to improve the thermal comfort and energy-saving efficiency of bridge load air conditioning cabin caused by constant speed air supply.The physical model of economy cabin and human body of B737 passenger plane is established by using CFD(Computational Fluid Dynamics)method.The validity of the model is verified by experiments.According to this model,the longitudinal temperature field and velocity field in the cabin are simulated under different air supply speeds in summer,and the influence of air supply speed on the distribution of air flow field in the cabin is analyzed.Gagge two-node human thermal regulation model is introduced to study the variation of human body temperature in cabin under different air supply velocities.According to the IPMV-PPD(Integrated Predicted Mean Vote-Predicted Percentage of Dissatisfied people)index and the values at the sampling points,the variation of thermal comfort in the cabin environment with different air supply velocities is obtained by Gauss fitting method.By synthesizing the thermal comfort change rule of human body and cabin environment,we can get the air supply speed range which can meet the different needs of both.It is helpful to obtain better comfort effect and green energy-saving effect in practical application of bridge load air conditioning.