Decay of Turbulence in a Closed Vessel : 1st Report, Decay of Turbulence Intensity

An experimental study of the characteristics of turbulence in closed vessels, which may be available, for example, to the analysis of turbulent combustion in an engine cylinder, is presented.The decaying process of the characteristics of turbulence in a closed vessel is better considered to be divided into two periods. In the first period (pre-relaxation period) they are mainly influenced by the way that the turbulence has been generated and in the second period (relaxed period), that is nearly a homogeneous one, they are scarcely influenced by the way of generation, but inevitably by the wall of vessel.As to the relaxed period, an empirical relation for the change of the turbulence intensity is formulated in this paper.