| Arc-heated Wind Tunnel is one of the important ground-based experimental equipments to simulate the real reentry environment of the space aircraft. The test of Thermal Protecting System (TPS) property and ablating experiments of thermal protecting materials need to be proceeded in Arc-heated Wind. In decades, with the rapid development of returning space aircraft and planet probe, the technique of reentry has been improved a lot, while there still exist a quantity of challenging and aggressive professional problems for reentry process. In order to obtain exact information of reentry environment and ablating property of ablator, we are expected to go on with further research on high temperature and high enthalpy flow generated by arc heater, which is the most important part of Arc-heated Wind Tunnels.In this thesis,20kw arc heater is selected as a study model and in order to save computational calculating time and source, we simplify the real arc heater model into a two dimensional model in cylindrical system. According to the structure and basic flow property of arc heater, we use3-Band radiation transfer model, multiple temperature models, low Re number turbulent model, and electrical model as basic models to simulate the flow field in20kw arc heater. Combining with the experimental data, we compare the numerical results with experimental results about arc voltage, impact pressure and heat flux. All of them agree with each other well. Finally, we pay a great attention to the effect of radiation transfer model on temperature and flow field distributions in arc heater. In accordance with the comparison between3-Band model and line by line model, we would like to evidently announce its accuracy and advantages of3-Band model. Subsequently, we discuss and analyze the effect of radiation and convection heat transfer in arc heater in details by applying3-Band model. Moreover, on basis of comparison, we evidently validate and confirm the important effect of radiation in arc heater. |
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