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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

REAL GAS EFFECTS ON DRAG REDUCTION FOR SPIKES OF DIFFERENT GEOMETRY

Shailendra Kumar
Department of Mechanical Engineering, Indian Institute of Technology Guwahati 781039, Assam, India

Jay Patel
Department of Mechancial Engineering, IIT Guwahati, India

Vinayak Kulkarni
Department of Mechanical Engineering, Indian Institute of Technology Guwahati 781039, Assam, India

Satyapramod Jammy
Department of Mechanical Engineering, SRM University, Hyderabad, India

DOI: 10.1615/IHMTC-2019.1380
pages 823-828

要約

Drag reduction for the blunt object is one of the major aspects for the high-speed aerodynamics. This investigation becomes more important for the non-equilibrium hypersonic flow. In contrast to this, an in-house chemical non-equilibrium flow solver is successfully validated and then employed for drag reduction studies for high enthalpy laminar flows. Present studies are carried for the wave drag force and corresponding drag reduction by using spiked body concept. Here, multiple shapes of the spike tip: spherical, conical and flat is used for the gathering efficient drag reduction on the spherical body. The downward deflection of the conical bow shock wave is noticed because of the strong variation of specific heats with the temperature. This movement of the shock wave decreases the drag reduction efficiency over the blunt object. At the higher stagnation enthalpy, this reduction is independent of the selection of the spike tip. However, a spike with flat tip is the best suited candidate for the drag reduction in the reacting environment.

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