排ガス効率から見たPCC CAR HOLDベンティレーション形態について

概要

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For an effective dilution of the exhaust gas concentration in the car hold, attentions should be given to the improvement of the conventional ventilation system. Several different schemes of ventilation layout and adoption of rotary fan have been studied analytically. The air flow and the gas concentration in the car hold have been analyzed under the turbulent flow field by using k-ε two-equation turbulence model and the numerical solutions have been obtained by using the MAC scheme. Actual car hold dimensions have a characteristic of a large length and width and relatively a small depth, therefore the horizontal flows have an governing effect compared to the vertical flow induced, for instance, by the density difference. In such a flow pattern what behavior of gas concentration distribution initially having a heavier or lighter density is presented is an interest for us. Influence of the relative locations of inlet and outlet of air as well as the periodical change of direction of air blow by the rotary fan on the dilution efficiency is an another interesting feature.
社団法人日本船舶海洋工学会の論文
1999-03-29