Experiment And Simulation Of Sensible Heat Loss For Occupant In Aircraft Cabin

Aircraft cabin is a relatively narrow and crowded closed space, in which the passenger needs to spend a few hours of short journey or dozens of hours of long journey, so the cabin environment is particularly important for passenger's comfort and health. Human as heat source, obstacle for flow field influences the air flow field by exchanging energy and interaction with its environment. How to quantitatively evaluate the human heat loss and the relationship between the passenger and its environment has not been reported.In cabin, the sensible heat loss is the basic parameter that influences the flow field. Most of the studies aim to predict human related parameters, but need more attention on this basic parameter. Different with the ordinary office buildings, the cabin environment is characterized by lower wind speed, higher occupant density so the results from the former on the relationship between human heat loss and its environment are not able to apply to the cabin environment. Radiation is an important approach to sensible heat loss, occupying a large proportion. In a summary, the main contents we are going to study are the relationship between the passenger and its microenvironment, human convective and radiative heat loss.Due to the sensible heat loss in full cabin was influenced by many factors, it was difficult to study this project by experiment alone. The application of CFD technology to analyze the sensible heat loss and the flow field was a kind of effective method. However, CFD simulation results were greatly influenced by the calculation model and the near-wall treatment, it was necessary to build a simulation platform for a single passenger to choose the correct turbulence and radiation model with the calculated error. After verified, these models were applied to full cockpit.Research found that The ratio of convection to radiation(C/R) was different with different positions under different conditions, the radiant heat loss in aircraft account for larger percentage. The radiative heat transfer coefficient has nothing to do with the distribution of temperature of cabin enclosure and positions of human body, 3.8W/(m2·K). The mean radiant temperature was influenced by the temperature difference between cabin enclosure and seat. The convective heat transfer coefficient is affected by temperature difference between the skin temperature and local air temperature weakly, but stronger by the local wind speed. The combination of shear-stress transport k-?(SST k-?) turbulent model and Surface-to-Surface Radiation model(S2S) had the capability of predicting the sensible heat loss with high precision. By the comparison with experimental results, SST k-? had an error of 6.23%. The radiation model had an error of 0.07%, the sensible heat loss produced a deviation of 3.55%.