船槽外放出ガスの挙動-II

概要

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In a gentle wind, the heavy and combustible gas emitted from a ship's oil tank falldown on the sea surface around the ship, and there will be generated a danger of fire and explosion. In order to make it clear the movement of gas in these conditions, visual investigations were performed makig use of the model of a tanker in a water tank. A summary of the results is shown as follows: (1) When wind velocity is below 1m/sec, an axis of plume of gas diffusion reach to the sea surface and the concentration at this point will become the highest. (2) Under these conditions, maximum concentration of gas on the sea surface (C_<max>) is calculated by the following equation. C_<max>=22・(Q^2・ρΔρ・g・l^5)^<1/3> l≑√<<H_e>^2+<X_<max>>^2> (3) The horizontal distance (X_<max>) between the gas emitting point and the point which is reached up to the C_<max>, is estimated by the Froude Number (Fr.), H_e/X_<max>=0.016 Fr^<-1・1> (4) The value of X_<max> when the C_<max> become over the value of 1/5 L.E. L, is shorter than 2.5B (B: ship's width) from ship side and the wind velocity is under 0.62m/sec in that case.
社団法人日本航海学会の論文
1983-09-25