Abstract
Experiments on heat transfer in supersonic underexpanded high-enthalpy air jets are conducted on the VGU-4 induction plasmatron at the pressure in the compression chamber of 8.5 hPa. At the air flow rate of 3.6 g/s and the high-frequency generator powers of 45 kW(regime 1) and 64 kW (regime 2) the heat fluxes to the copper surface at the stagnation point of watercooled cylindrical models along the axes of dissociated air jets are measured. The models, 30 mm in diameter, could have a flat face or a hemispherical nose. In the same regimes, the stagnation pressures are measured using the Pitot tube in the shape of a cylinder, 30 mm in diameter, having either a flat face or a hemispherical bluntness with a receiving hole, 14 mm in diameter. For the experimental conditions calculations of flows in the plasmatron discharge channel and supersonic underexpanded jets issuing from the discharge channel are performed within the framework of the Navier–Stokes and Maxwell equations. The heat fluxes to the experimental models are computed and compared with the experimental data.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. Park, Nonequilibrium Hypersonic Aerothermodynamics (Wiley, New York, 1990).
A. F. Kolesnikov, “Conditions of Simulation of Stagnation Point Heat Transfer from a High-Enthalpy Flow,” Fluid Dynamics 28 (1), 131 (1993).
A. F. Kolesnikov, “Conditions of the Local Similarity of the Thermochemical Interaction of High-Enthalpy Gas Flows with an Indestructible Surface,” Teplofiz. Vys. Temp. 52 (1), 118 (2014).
A. F. Kolesnikov and V. I. Sakharov, “Similarity between the Heat Transfer to a Model in an Underexpanded Dissociated-Air Jet of a High-Frequency Plasmatron and to a Sphere in a High-Velocity Flow in the Terrestrial Atmosphere,” Fluid Dynamics 51 (3), 400 (2016).
A. N. Gordeev and A. F. Kolesnikov, “Induction Plasmatrons of the VGU Series,” in: Topical Problems of Mechanics. Physical and Chemical Dynamics of Liquids and Gases [in Russian] (Nauka, Moscow, 2010), p. 151.
N. E. Afonina, S. A. Vasil’evskii, V. G. Gromov, A. F. Kolesnikov, I. S. Pershin, V. I. Sakharov, and M. I. Yakushin, “Flow and Heat Transfer in Underexpanded Air Jets Issuing from the Sonic Nozzle of a Plasma Generator,” Fluid Dynamics 37 (5), 803 (2002).
V. I. Sakharov, “NumericalSimulation of Thermally and ChemicallyNonequilibriumFlows and Heat Transfer in Underexpanded Induction Plasmatron Jets,” Fluid Dynamics 42 (6), 1007 (2007).
A. N. Gordeev, A. F. Kolesnikov, and V. I. Sakharov, “Flow and Heat Transfer in Underexpanded Nonequilibrium Jets of an Induction Plasmatron,” Fluid Dynamics 46 (4), 623 (2011).
V.A. Bashkin, I.V. Egorov, B. E. Zhestkov, and V. V. Shvedchenko, “Numerical Investigation of the Flowfield and Heat Transfer in the Duct of a High-Temperature Aerodynamic Setup,” Teplofiz. Vys. Temp. 46 (5), 771 (2008).
A. B. Gorshkov, “Numerical Modeling of Flow past Models in the Jet of a High-Frequency Plasmatron,” Kosmonavt. Raketostr., No. 3 (36), 54 (2004).
V. I. Vlasov, “Theoretical Investigation of High-Temperature Gas Flow in the Discharge and Working Chambers of a HF Plasmatron,” Kosmonavt. Raketostr., No. 23, 18 (2003).
I. V. Egorov, B. E. Zhestkov, and V. V. Shvedchenko, “Determination of the Catalytic Activity ofMaterials at High Temperatures in the Hypersonic VAT-104 Wind Tunnel,” Uch. Zap. TsAGI 45 (1), 3 (2014).
N. E. Afonina, V. G. Gromov, and V. I. Sakharov, “HIGHTEMP Technique of High Temperature Gas Flows Numerical Simulations,” in: Proc. 5th Europ. Symp. on Aerothermodyn. Space Vehicles. Cologne, Germany, 2004. SP 563 (ESTEC, Noordwijk, 2004), p. 323.
V. P. Glushko et al., Thermodynamic Properties of Individual Materials [in Russian] (Nauka, Moscow, 1978), Vols. 1, 2.
S. A. Vasil’evskii and A. F. Kolesnikov, “Numerical Simulation of Equilibrium Induction Plasma Flows in a Cylindrical Plasmatron Channel,” Fluid Dynamics 35 (5), 769 (2000).
E. P. Simonenko, N. P. Simonenko, A. N. Gordeev, A. F. Kolesnikov, V.G. Sevastyanov, and N. T. Kuznetsov, “Sol Gel Synthesis of Ultra-High-Temperature Ceramic HfB2-SiC Materials and Investigation of Their Behavior in High-Enthalpy Air Flows,” in: Promising Technologies, Materials, and Instruments for Space Research and On-Ground Applications. Collection of Brief Papers. 8th Intern. Conf. “Space Challenge of the 21st Century. Promising Technologies, Materials, and Instruments for Space Research (SPACE’2017),” Sochi, October 16–21, 2017, ISBN978-5-91845-076-5, p. 91.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.N. Gordeev, A.F. Kolesnikov, V.I. Sakharov, 2018, published in Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, 2018, No. 5, pp. 125–133.
Rights and permissions
About this article
Cite this article
Gordeev, A.N., Kolesnikov, A.F. & Sakharov, V.I. Experimental and Numerical Investigation of Heat Exchange between Underexpanded High-Enthalpy Air Jets and Cylindrical Models. Fluid Dyn 53, 702–710 (2018). https://doi.org/10.1134/S0015462818050105
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0015462818050105