Decay of Turbulence in a Closed Vessel : 3rd Report, Relationship between the Relaxation Time and Various Related Conditions

概要

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In order to know the characteristics of turbulence immediately before the initiation of combustion in an engine cylinder, it must be known, in addition to the decay-law for the relaxed period, how the initial conditions of generating turbulence have influences on the decay process of turbulence or how long the significant characteristic of incipient turbulence continues. In this respect, the authors carried out an experimental study to find out the relation between the relaxation time (duration before relaxation) and the various related conditions of generating turbulence in a closed vessel. The results obtained show that the relaxation time increases with an increase in the interval of orifices in the turbulence-generating disc, a decrease in the diameter of orifice, a decrease in velocity of gas blowing out of orifices, an increase in the diameter of the vessel and an increase in the eccentricity (distance from the center of the turbulence-generating disc) in the case of single orifice.
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