Institute of Space and Aeroautical Science University of Tokyo
Institute of Space and Aeroautical Science University of Tokyo
Institute of Space and Aeroautical Science University of Tokyo
In order to investigate the heat transfer problems of unsteady flows encountered in internal combustion engines for aeroplanes, an equipment of wind tunnel was made to supply air-flow with arbitrary unsteadiness; for example, sinesoidally pulsating flows of frequency of 3cps at 80% amplitude to 10cps at 10%. Using the present equipment, the heat-transfer characteristics of a heated plate in sinesoidally pulsating flows were studied. At lower frequencies, the pulsation of main velocity has little influence upon the time-mean heat transfer coefficient, though it pulsates in the same order of magnitude as that of velocity. At higher frequencies, the pulsation reduces the heat transfer from the plate to flow with little amplitude in pulsation. The influences of flow pulsation upon the amplitude and the time-lag of velocity and temperature distributions in the boundary layer were also investigated.
非定常気流の熱伝達
SA0125439.pdf
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