TY - GEN
T1 - Numerical simulation of energy deposition in a supersonic flow past a hemisphere
AU - Mortazavi, Mahsa
AU - Knight, Doyle
AU - Azarova, Olga
AU - Shi, Jingchang
AU - Yan, Hong
N1 - Publisher Copyright: © 2014 by M. Mortazavi, D. Knight, O. Azarova, J. Shi and H. Yan. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.
PY - 2014
Y1 - 2014
N2 - The interaction of a laser-generated plasma with a hemisphere cylinder at Mach 3.45 is simulated using the Euler equations and assuming a perfect gas. The instantaneous laser discharge is assumed to create a spherical region of heated gas upstream of the blunt body shock. The energy deposition generates a blast wave which propagates radially outwards. The heated region convects with the flow and interacts with the blunt body shock. The interaction results in a momentary decrease in the drag coefficient. The results are compared with experimental data of Adelgren et al for surface pressure. The peak pressure on the hemisphere due to the impact of the blast wave is matched in the simulation to estimate the thermal efficiency (i.e., the fraction of the laser discharge energy resulting in heating of the gas). The predicted centerline pressure vs time on the hemisphere is compared with the experimental data. The comparison indicates that the perfect gas Euler simulations with the assumed initial condition are incapable of accurately predicting the surface pressure and hence the net drag reduction.
AB - The interaction of a laser-generated plasma with a hemisphere cylinder at Mach 3.45 is simulated using the Euler equations and assuming a perfect gas. The instantaneous laser discharge is assumed to create a spherical region of heated gas upstream of the blunt body shock. The energy deposition generates a blast wave which propagates radially outwards. The heated region convects with the flow and interacts with the blunt body shock. The interaction results in a momentary decrease in the drag coefficient. The results are compared with experimental data of Adelgren et al for surface pressure. The peak pressure on the hemisphere due to the impact of the blast wave is matched in the simulation to estimate the thermal efficiency (i.e., the fraction of the laser discharge energy resulting in heating of the gas). The predicted centerline pressure vs time on the hemisphere is compared with the experimental data. The comparison indicates that the perfect gas Euler simulations with the assumed initial condition are incapable of accurately predicting the surface pressure and hence the net drag reduction.
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U2 - https://doi.org/10.2514/6.2014-0944
DO - https://doi.org/10.2514/6.2014-0944
M3 - Conference contribution
T3 - 52nd Aerospace Sciences Meeting
BT - 52nd Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 52nd Aerospace Sciences Meeting 2014
Y2 - 13 January 2014 through 17 January 2014
ER -