SOME RESULTS OF ELECTROSTATIC PROBE STUDIES OF TURBULENT HYPERSONIC WAKE PLASMAS, (2005)
Heckman,D., Emond,A., Sevigny,L.
Electrostatic probes were used in various array configurations to examine the characteristics of the turbulent wake behind hypersonic spheres in a ballistic range facility. Convection velocities...
Structure of Turbulent Wakes of Hypersonic Spheres as Inferred with Ion Probes. (2005)
Survey arrays of ion probes have been used to study the structure of the ionized turbulent wakes of 2.7 inch diameter spheres flown at 14,500 feet/second in atmospheres of nitrogen at pressures of...
Ion Density Measurements in the Wake of a Hypersonic Sphere, (2005)
Sevigny,L., Heckman,D., Caron,P.
A report is presented of the results of a major research effort undertaken to determine experimentally, through the use of cylindrical electrostatic probes and existing probe theory, the levels of...
Summary of Re-Entry Physics Research Program on Turbulent Wakes (2004)
This report consists mainly of a catalogue of over 100 DREV reports, technical notes and memoranda issued during the course of the jointly sponsored DREV and ARPA research program on hypersonic...
VELOCITY DECAY IN THE INTERMEDIATE WAKE REGION BEHIND HYPERSONIC SPHERES. (1998)
Axial velocity decay data for hypersonic sphere wakes obtained with the sequential spark and probe array techniques were fitted with an equation of the form V sub w/V sub infinity symbol = C sub 1...
EXPERIMENTAL STUDY OF TURBULENT WAKES IN FREE-FLIGHT RANGES, (1998)
Heckman,D., Tardif,L., Lahaye,C.
Experiments undertaken to investigate both the mean and fluctuating properties of turbulent wakes are described. The diagnostic techniques used to make local measurements in the wake utilize an...
A Shock Wave Attenuation Treatment for Ballistic Ranges, (1998)
Heckman,D., Lahaye,C., Moir,L., Podesta,B., Robertson,W.
Effort has recently been devoted to finding a means to alleviate the effects of the reflection at the walls of the range tank of the bow and wake shock system originating with a hypersonic...
Reflections of Weak Shock Waves from Acoustic Materials, (1998)
Cloutier,M., Devereux,F., Doyon,P., Fitchett,A., Heckman,D.
A number of materials having good acoustic absorption properties have been tested in order to determine their relative effectiveness in attenuating weak high-frequency shock waves propagating in...
Velocity Mapping of Turbulent Wakes of Hypersonic Spheres with Arrays of Ion Probe Pairs, (1998)
Sevigny,L., Heckman,D., Emond,A.
The technique of measuring convection velocity in the hypersonic wake with a pair of in-line probes has been applied on a large scale to the mapping of the velocity field in the hypersonic wake...
Electron Density Behavior in the Wake of Spheres Flown at 14,500 Feet/Second, (1998)
Heckman,D., Sevigny,L., Fitchett,A., Emond,A., Doyon,P.
The amplitudes and widths of the assumed gaussian distributions of electron density in the wakes of hypersonic spheres flown at 14,500 feet/second in atmospheres of air and nitrogen at various...
Structure of Turbulent Wakes of Hypersonic Spheres as Inferred with Ion Probes, (1998)
Survey arrays of ion probes were used to study the structure of the ionized turbulent wakes of 2.7 in. diameter spheres flown at 14500 ft/s in atmospheres of nitrogen at pressures of 7.6 and 20 Torr....
Behavior of Turbulent Scales in Hypersonic Sphere Wakes, (1998)
The behavior of macroscales associated with the charge density fluctuations in the turbulent wakes of hypersonic spheres has been investigated using both Langmuir electron probes and continuum...
Heckman, D., Sevigny, L., Emond, A.
Measurements were carried out in the ballistic range facilities at DREV of the absolute electron density levels in the wakes of 2.7 inch diameter spheres flown at 14,500 feet/second in air...