Abstract— Experiments on heat transfer in subsonic dissociated-air jets are performed on 100 kW VGU-4 induction plasmatron. The heat fluxes to the water-cooled surfaces of copper, silver, tantalum, beryllium, niobium, gold, molybdenum, and quartz are measured at the stagnation point on a cylindrical flat-nosed model, 50 mm in diameter, having rounded edges at 50 and 100 hPa pressures in the low-pressure chamber and the high-frequency (HF) generator power of 30 to 70 kW. At the same pressures and the HF generator powers of 45 and 64 kW the convective heating of a specimen of sintered silicon carbide is studied in the surface temperature range from 1720 to 1910 K. The predominance of the surface catalyticity effect on the heat flux with respect to nitrogen and oxygen atom recombination is demonstrated. Under the experimental conditions the air plasma flow in the discharge channel of the plasmatron, the subsonic jet flow past the cylindrical model, and the heat transfer to the stagnation point on the model are numerically simulated. Basing on the comparison of the experimental and calculated data on the heat fluxes to the surfaces of metals ( T w = 300 K), quartz ( T w = 572–722 K), and silicon carbide ( T w = 1720–1910 K) the quantitative catalyticity gradation of the materials considered with respect to heterogeneous recombination of nitrogen and oxygen atoms is established.

中文翻译：

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亚音速离解空气射流中表面催化的热效应。高频等离子体的实验与数值模拟

摘要——在 100 kW VGU-4 感应等离子管上进行了亚音速分解空气射流的传热实验。流向铜、银、钽、铍、铌、金、钼和石英的水冷表面的热通量是在直径为 50 毫米、圆角边缘为 50 度的圆柱形平头模型的驻点处测量的。低压室中的压力为 100 hPa，高频 (HF) 发电机功率为 30 至 70 kW。在相同的压力和 45 和 64 kW 的 HF 发生器功率下，在 1720 至 1910 K 的表面温度范围内研究了烧结碳化硅样品的对流加热。证明了氮和氧原子的重组。在实验条件下，对等离子管放电通道中的空气等离子体流、通过圆柱模型的亚音速射流以及向模型上驻点的传热进行了数值模拟。基于对金属 (T w = 300 K)、石英 (T w = 572–722 K) 和碳化硅 ( T w = 1720–1910 K) 表面的热通量的实验和计算数据的比较建立了关于氮和氧原子的异质复合考虑的材料的定量催化分级。