Experimental and Numerical Modeling of Heat Transferto Graphite Surface in Underexpanded Dissociated-Nitrogen JetsстатьяПеревод
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Дата последнего поиска статьи во внешних источниках: 15 декабря 2021 г.
Аннотация:Experiments on heat transfer to a graphite specimen in supersonic underexpanded highenthalpy nitrogen jets are conducted in the VGU-4 HF plasmatron of Institute for Problems inMechanics of the Russian Academy of Sciences at the pressure in the low-pressure chamber of8.5 hPa, the gas flow rate through the discharge channel of 3.6 g/s, and the HF generator power of64 kW. Water-cooled conical nozzles with exit section diameters of 30, 40, and 50 mm were used.Numerical simulation of nitrogen plasma flow in the discharge channel of the plasmatron and flow ofunderexpanded dissociated nitrogen jet past a cylindrical sting with the graphite specimen is performed within the framework of Navier–Stokes equations and simplified Maxwell equations for theexperimental conditions in supersonic regimes. From the comparison of the experimental and calculated data on the heat fluxes to the specimen surface the effective coefficient of heterogeneous nitrogen-atom recombination on the graphite surface is determined for the temperatures from 2273 to2500 K.