Abstract
The existing computer code ARCFLO4 to solve the segmented arc-heater flows is improved to consider an argon gas injected into electrodes as well as an air injected from the constrictor wall. Additional species continuity equation for the argon gas including the diffusion term is solved with original governing equations. Also the numerical wall boundary condition where the air is injected from small points between constrictor disks is applied. The new version of the code is used to simulate the flows in the Panel Teat Facility, the Aerodynamic Heating Facility, and Interaction Heating Facility of NASA Ames Research Center. The computations show that the argon ratio changes dramatically in the arc-heater and it influences strongly the distribution of the thermodynamic and transport properties of the flow. At the upstream region of the constrictor, the arc-column is broad and it makes the radiation enhanced. Also, a periodic distribution of the conduction heat flux on a constrictor disk is shown due to the gas injected from points between the constrictor disks. Finally, through the comparison between computations and the experiments, it is certain that the present computation predicts well the total heat flux on the arc-heater wall as well as the operational data.
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