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On the mechanism of wave drag reduction by concentrated laser energy deposition in supersonic flows over a blunt body

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Abstract

Two-dimensional numerical simulations are carried out to explain the possible mechanism of wave drag reduction by concentrated laser energy deposition on the stagnation streamline of a steady supersonic flowfield over a semicircular body. The simulations essentially involve the solution of the Navier–Stokes equations augmented by species conservation equations. By assuming that the thermochemical equilibrium is reached immediately after the cessation of the laser pulse, the temperature and species concentrations of the energy deposition zone are calculated by a Helmholtz free energy minimization procedure. It is found that, after cessation of the laser pulse, the energy deposition zone transforms itself into a radially expanding blast wave and a hot core region which are convected downstream by the supersonic flow external to it. Subsequently, the blast wave interacts with the bow shock ahead of the semicircular body. Upon interaction, part of the blast wave is transmitted, and the rest is reflected as a weak shock wave. The low-pressure region behind the transmitted blast wave is found to be the primary reason for the reduction of the wave drag on the body. A detailed analysis is carried out on the distribution of pressure, temperature, species concentrations, and velocity at various time instants and spatial locations to arrive at the conclusions.

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  1. Aerospace Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India

    R. Joarder

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Correspondence to R. Joarder.

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Communicated by A. Sasoh and A. Higgins.

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Joarder, R. On the mechanism of wave drag reduction by concentrated laser energy deposition in supersonic flows over a blunt body. Shock Waves 29, 487–497 (2019). https://doi.org/10.1007/s00193-018-0868-3

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