Abstract
Numerical studies were conducted to determine current collection characteristics of flush mounted electrostatic probes on a flat plate in ionized hypersonic flows. The effects of probe size, position, bias, and local flow properties were explored in detail. To this end, the charged particle conservation equations were solved with the two- and three-dimensional Poisson equation, and the results compared with thick sheath probe data obtained in hypersonic hock tunnel experiments. Agreement with the experimental data is good. Nomenclature diffusion coefficient Damkohler number, krL?/D0 electron charge probe current current density Mach number number density pressure probe radius Reynolds number Schmidt number temperature time flow velocity probe voltage distance from plate leading edge source term distance normal to surface of flat plate ratio of ion to electron diffusion coefficient boundary-layer thickness D Da e / J M N,n p R Re Sc T t 17, u V x vv Y, y
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