Accession Number : AD0134400


Title :   AN AERODYNAMIC STUDY OF THE ELECTRIC WIND


Descriptive Note : Thesis


Corporate Author : CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS


Personal Author(s) : HARNEY, DONALD JAMES


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/134400.pdf


Report Date : Jan 1957


Pagination or Media Count : 48


Abstract : The basic physical process considered is the appearance of a pressure gradient in a slightly ionized gas under the influence of an electric field. On a molecular scale this process involves the acceleration of ions in an electric field and the transfer of momentum to the main body of the fluid through collisions. A particular phenomenon involving this basic process is the pressure gradient in a point corona discharge and the resulting electric wind. The experimental arrangement studied is a point to a downstream coaxial cylinder discharge in air. The difficulity of applying boundary conditions to the mathcinatical description of the process requires some simplifying assumptions. A simple one-dimensional model of the physical situation is considered, the electrical field equations being approached from the consideration of a space charge limited current The functional relations derived appear consistent with the experimental results for the limiting cases implied by the assumptions. Velocity variations encountered in the induced flow of air present questions regarding the bulk parameter which describes the molecular interchange of monetum, the ion mobility. While this experiment was not for the purpose of measuring ion mobilities, it is believed that in any applications involving the basic process in the working fluid of the aerodynamicist the time, density, temperature and humidity dependence of the ion mobility requires data which is not now available.


Descriptors :   *TURBULENCE , *GAS IONIZATION , *ELECTRICAL CORONA , PRESSURE GRADIENTS , AIR , THESES , ELECTRICAL PROPERTIES , COAXIAL CONFIGURATIONS , SPACE CHARGE , MOMENTUM TRANSFER


Subject Categories : Fluid Mechanics
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE