Plasmas in high speed aerodynamics

A review is presented of the studies in the former Soviet Union and in the USA of the mutual interactions of plasmas and high speed flows and shocks. There are reports from as early as the 1980s of large changes in the standoff distance ahead of a blunt body in ballistic tunnels, significantly reduced drag and modifications of travelling shocks in bounded weakly ionized gases. Energy addition to the flow results in an increase in the local sound speed that leads to expected modifications of the flow and changes to the pressure distribution around a vehicle due to the decrease in local Mach number. The critical question was, did a plasma provide a significant energy multiplier for the system? There have been a large number of experimental studies on the influence of a weakly ionized plasma on relatively low Mach number shocks and inherently also on the influence of the shock on the plasma. This literature is reviewed and illustrated with representative examples. The convergence through more controlled experiments and improved modelling to a physics understanding of the effects being essentially due to heating is outlined. It is demonstrated that the heating in many cases is global; however, tailored experiments with positive columns, dielectric barrier discharges and focused microwave plasmas can produce very localized heating. The latter appears more attractive for energy efficiency in flow control. Tailored localized ionization and thermal effects are also of interest for high speed inlet shock control and for producing reliable ignition for short residence time combustors, and work in these areas is also reviewed.

[1]  N. Hershkowitz.  Review of recent laboratory double layer experiments , 1985 .

[2]  Tetsuya Sato,et al.  Double layer formation caused by contact between different temperature plasmas , 1985 .

[3]  L. Martinelli,et al.  Shock wave propagation and dispersion in glow discharge plasmas , 2001 .

[4]  Irving Langmuir,et al.  The pressure effect and other phenomena in gaseous discharges , 1923 .

[5]  N. Malmuth,et al.  Drag Reduction by Plasma Filaments over Supersonic Forebodies , 2003 .

[6]  M. Raadu.  The physics of double layers and their role in astrophysics , 1989 .

[7]  M. Jaffrin.  Shock Structure in a Partially Ionized Gas , 1965 .

[8]  A. Kolb.  PRODUCTION OF HIGH-ENERGY PLASMAS BY MAGNETICALLY DRIVEN SHOCK WAVES , 1957 .

[9]  U. Fantz,et al.  Spectroscopic diagnostics of glow discharge plasmas with non-Maxwellian electron energy distributions , 1994 .

[10]  A. Uvarov,et al.  REVIEWS OF TOPICAL PROBLEMS: Kinetic and gasdynamic processes in nonequilibrium molecular physics , 1992 .

[11]  R. W. Lutz,et al.  Vibrational Relaxation of Deuterium by a Quantitative Schlieren Method , 1966 .

[12]  B. David Green,et al.  Experimental determination of the Einstein coefficients for the N2(B–A) transition , 1989 .

[13]  B. Ganguly,et al.  Local acoustic shock velocity and shock structure recovery measurements in glow discharges , 1999 .

[14]  Roberto Pini,et al.  Probe-beam deflection diagnostics of shock waves generated during laser drilling , 1995 .

[15]  A. Kuranov,et al.  Use of MHD systems in hypersonic aircraft , 1998 .

[16]  I. Adamovich,et al.  Effect of electron density on shock wave propagation in optically pumped plasmas , 2002 .

[17]  Vadim S. Slavin,et al.  Magnetohydrodynamics Generator with Plasma Layers as Power Source Aboard a Hypersonic Airplane , 2001 .

[18]  V. I. Lagutin,et al.  Aerodynamic drag reduction by plasma and hot-gas injection , 2000 .

[19]  A. Klimov,et al.  Propagation of shock waves in the plasma of a glow discharge , 1993 .

[20]  G. Candler,et al.  Vibrational Excitation, Thermal Nonuniformities, and Unsteady Effects on Supersonic Blunt Bodies , 2002 .

[21]  H. Maciel,et al.  Free double layers in mercury-arc discharges , 1989, Journal of Plasma Physics.

[22]  Shock waves in nonuniform gas , 1999 .

[23]  L. Conde,et al.  Electron impact ionization by drifting electrons in weakly ionized plasmas. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

[24]  B. Ganguly,et al.  Electric field and plasma emission responses in a low pressure positive column discharge exposed to a low Mach number shock wave , 2000 .

[25]  J. Shang.  Validation of Plasma Injection for Hypersonic Blunt-Body Drag Reduction , 2003 .

[26]  Axial Pressure Gradient in Direct‐Current Discharges , 1969 .

[27]  B. Ganguly,et al.  He metastable density in a double layer formed by a diameter discontinuity in a positive column. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

[28]  A. P. Ershov,et al.  Propagation of weak shock waves in plasma of longitudinal flow discharge in air , 1991 .

[29]  H. J. Oskam,et al.  Volume Forces in Plasmas , 1967 .

[30]  P. Bletzinger,et al.  Shock wave damping and dispersion in nonequilibrium low pressure argon plasmas , 1997 .

[31]  A. Ferri.  H. Supersonic Flows with Shock Waves , 1954 .

[32]  M. Druyvesteyn.  The electrophoresis in the positive column of a gas discharge , 1935 .

[33]  S. Kuo,et al.  Observation of supersonic shock wave mitigation by a plasma aero-spike , 2002 .

[34]  Anatoly A. Maslov,et al.  Influence of a Counterflow Plasma Jet on Supersonic Blunt-Body Pressures , 2002 .

[35]  L. Pekker,et al.  Pressure gradients and flow patterns in the direct current positive column , 1993 .

[36]  O. W. Greenberg,et al.  HYDRODYNAMIC MODEL OF DIFFUSION EFFECTS ON SHOCK STRUCTURE IN A PLASMA , 1960 .

[37]  N. Hershkowitz,et al.  Electron temperature differences and double layers , 1983 .

[38]  J. Loureiro,et al.  Electron excitation rates and transport parameters in direct-current N2 discharges , 1989 .

[39]  J. Loureiro,et al.  Time-dependence of the electron energy distribution function in the nitrogen afterglow , 2003 .