Accession Number : AD0730621

Title :   Nonlinear Resonant Wave Motion of a Radiating Gas,

Corporate Author : STANFORD UNIV CALIF DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Eninger,James Edward

Report Date : MAY 1971

Pagination or Media Count : 105

Abstract : A theoretical study is made of the wave motion of a radiating gas confined between two infinite parallel walls. The motion is driven perpendicular to the walls by a radiative flux of harmonically varying intensity. Attention is focused on a resonance phenomenon that occurs when the gas is driven at a frequency that is close to one of the natural acoustic resonant frequencies of the system. Away from these resonant frequencies, for conditions attainable in the laboratory, the response can adequately be described by a simplified theory that neglects gas-dynamic nonlinearities and radiative transfer due to perturbations in spontanous emission from the gas. Near resonance, it is shown that both these effects play an important role. In fact, if they are not taken into account, an invalid infinite response is predicted precisely at resonance. Thus the resonance condition provides an opportunity to study the coupled effects of gas-dynamic nonlinearities and radiative transfer on wave motion. The feasibility of an experiment to test the theoretical results is studied. The experimental device uses a wave tube to contain the gas. The viscous boundary layer on the side wall of this tube can have a significant effect on the wave motion. It is found that in order for this effect to remain small, the diameter of the tube would typically have to be greater than its length. (Author)

Descriptors :   (*GASES, COUETTE FLOW), BLACKBODY RADIATION, THERMAL RADIATION, RESONANT FREQUENCY, SHOCK WAVES, ACOUSTICS, MATHEMATICAL ANALYSIS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE