Heat Transfer of a Cylindrical Body with Catalytic Surface in Subsonic Nonequilibrium Air Plasma Flow

• Published in: Fluid dynamics Vol. 57; no. 5; pp. 639 - 656
• Main Authors: Bryzgalov, A. I., Vasil’evskii, S. A., Kolesnikov, A. F., Yakush, S. E.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-10-2022; Springer; Springer Nature B.V
• Subjects: Air plasma; Axisymmetric bodies; Axisymmetric flow; Catalytic activity; Classical and Continuum Physics; Classical Mechanics; Cylindrical bodies; Cylindrical plasmas; Diameters; Engineering Fluid Dynamics; Enthalpy; Equilibrium flow; Flow characteristics; Fluid- and Aerodynamics; Heat flux; Heat transfer; Niobium; Nitrogen atoms; Physics; Physics and Astronomy; Silver; Steady state; Subsonic flow; Tantalum; Two dimensional models; Water flow; HF-plasmatron; catalytic surface; numerical model; subsonic flow; air plasma; heat transfer; validation
• ISSN: 0015-4628; 1573-8507
• DOI: 10.1134/S0015462822050020

Steady-state subsonic flows of nonequilibrium air plasma past a cylindrical body with plane face and heat transfer are investigated under the conditions characteristic of testing the materials in the IPG-4 HF-plasmatron in the Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences. A two-dimensional computational model that makes it possible to calculate axisymmetric flows past bodies with regard to detailed kinetics of partially ionized and dissociated air is proposed. Numerical calculations of steady-state flows and heat fluxes towards a water-cooled cylindrical body 50 mm in diameter at whose front face a water-flow calorimeter is mounted are carried out. The calculations are conducted for a series of experiments on the IPG-4 facility with various metal heat-absorbing walls (made of copper, silver, gold, niobium, tantalum, beryllium, and molybdenum). The flow characteristics and the component concentration distributions over the computational domain and in the neighborhood of the surface with various catalytic properties with respect to heterogeneous recombination of oxygen and nitrogen atoms are obtained. The radial distributions of both the conductive and recombination components of heat flux and the total heat flux on the surface of the body are calculated. The effect of overequilibrium heating that leads to appearance of high heat fluxes in the neighborhood of the interface of materials with strongly different catalytic activity is demonstrated. A comparison with the experimental data showed that the computational model makes it possible to predict heat fluxes on the catalytic surfaces with the accuracy not less than 10%.