EHD Research

This is the second year-end report on the EHD contract. Whereas previous work concentrated on building up the experimental facility and on delineating the effects of turbulence on breakdown, this work details the effects of turbulence on charged particle mobility. The two-phase injector is used exclusively. Spectral measurements of velocity and collector current are reported. These are used to determine the potential use of EHD in anemometry and to deduce particle size distributions. Measurements of charge distribution are also reported and a comparison is made between these and the spectral measurements. Equations defining an axisymmetric, turbulent EHD flow have been derived. Also, the feasibility of flow separation control with an EHD interaction has been investigated. (Author)