Abstract
The suppression of turbulence, caused by the increase of molecular viscosity due to high temperature in flames, was investigated in two experimental approaches. First, hydrogen jet diffusion flames were examined in the wide range of Reynolds numbers of nozzle flow. Second, isothermal hot air jets were examined with various efflux conditions of the nozzle fluid, because it was supposed that hot air jets are more suitable for investigation of the effects of viscosity increase resulting from high temperature on turbulence behavior. As a result, it was revealed that the turbulence suppression takes place also in the flame of high Reynolds number and exerts an important influence on the flame structure. The hot air jets showed a development of jet boundary layer similar to jet diffusion flames in a certain condition. This result suggests that, if a pertinent turbulence model can be obtained to represent the flows in the hot air jets, it may also be useful in the modeling of jet diffusion flames.
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