Trans RINA, Vol 156, Part B2, Intl J Small Craft Tech, Jul-Dec 2014
Figure 12: Speed Up - Sun Deck - angle 0 deg
The position of the local wind speed measurement points are sketched in the upper part of Figure 12 which also shows the label relevant at each probe placed on the scale model in the same position. The speed-up values are plotted in a top view sketch of the yacht deck being considered. The histogram graph in the lower part of the figure shows the speed up values on the vertical-axes while on the x-axes the probes labels are reported. The colour of each point in the deck region is determined by the value of the speed up quantity, which can be read in the coloured scale to the right of the figure.
In addition Figure 13 shows the standard deviation values of the speed up factors. They are plotted on the same top view of the deck sketch in the upper part of the figure, while in the lower part of the figure the histogram graph shows the standard deviation values on the vertical-axes for each of the probes labelled on the x axis. The colour of each point in the deck region is
determined by the value of standard deviation
quantity, which can be read in the coloured scale to the right of the figure.
4.3 EXHAUSTS DILUTION
As previously said the model has been placed on the wind tunnel turning table, in order to change the model position with respect to the wind so as to study the pollutants dispersion in the atmosphere when the air comes from various directions. Several tests with the aim
B-78
Figure 13: Speed Up Standard Deviation - Sun Deck - angle 0 deg
to evaluate the effect of wind on the exhaust plume dispersion have been performed; in particular different discharge layouts have been investigated at different wind speeds in both smooth and turbulent flow.
Figure 14: Exhausts horizontal discharge, u = 1 m/s, angle with respect to the wind direction: ‐90°
© 2014: The Royal Institution of Naval Architects
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