Accession Number : AD0721454

Title :   Fluctuations in Series Connected Open Cycle MHD Generators,

Corporate Author : TENNESSEE UNIV SPACE INST TULLAHOMA

Personal Author(s) : Dicks,J. B. , Jr. ; Wu,Y. C. L. ; Scott,Mary Hall ; Murray,E. M.

Report Date : FEB 1971

Pagination or Media Count : 14

Abstract : Fluctuations are present in MHD generators as stated previously in the literature. Attempts to relate these fluctuations to magnetoacoustical waves predicted by theory have not been successful. In this paper one describes another approach to fluctuation analysis. The theoretical and experimental methods used here are those of signal analysis involving functions such as probability density, cross-correlation, auto-correlations and power spectral density. It was found that the fluctuations in Hall voltage, electrode current, temperature, and pressure were all random Gaussian in nature. The probable source of the fluctuations was traced to turbulent fluxuations in the electric sheath properties and to conductivity fluctuations in the channel. Application of probability theory and function space analysis provides a new way of measuring the Hall parameter in the generator. Additional understanding on the operation of series connected generators is obtained through the observation that the fluctuations in the generator output are much lower than those that would be expected from adding the fluctuations of individual electrodes. This indicated that the generator must be studied as a whole in order to understand its behavior and that investigations involving a few electrodes are not sufficient to determine the overall generator performance. (Author)

Descriptors :   (*MAGNETOHYDRODYNAMIC GENERATORS, PERFORMANCE(ENGINEERING)), HALL EFFECT, ELECTRODES, PROBABILITY DENSITY FUNCTIONS, POWER SPECTRA, FOURIER ANALYSIS, SERIES(MATHEMATICS)

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE