OCR Text |
Show 5 . 3. Foaming Characteristics 3-1 Experimental Apparatus Fig.2 shows the experimental apparatus to comprehend the foam combustion methoQ llhe acrylic-resins cylynder, 28mm inside diameter, has porous filter near the botto~ Air is induced into the encloshure formed with cylynder, bottom and porous filter, and the liquid fuel is poured to the ini t ial he i gh t, ho (IIIIl). N ex t to disperse bubbles in liquid fuel, air is blown into the liquid fuel through the pourous filter by air pump. llhen height upper of foamed fuel, h(mm) , and apparent velocity of air in cyl inder, u (m/s) , are measured. llhe expantion ratio for foamed liquid, ¢, is defined h / ho. llhe evaporation rate is measured with heating the foamed liquid fuel by radiator localed above the foa~ T I 'h, ; Init ial Li<;1! id L:!vel I ,h ; F02!i:ed L i quid L:'/:!i I '¢ ; Expa ~t i on __ ~~tj~ ~ h/h ,! h Cyl ir.der (2Emm ¢ ) K:!ros ir.e OiOUS 'F ilter 3-2 Resul t and Discussion Fig.2 Experimental apparatus (1) Classification of foaming state According to the apparent air velocity, the state of liquid fuel changes, and they are class if i ed as, 1) Separate bubble: Most of bubbles separating in liquid fuel 2) Foam : Most of bubbles gathering on liquid fuel 3) Slag : Large bubbles blowing through liquid fuel l)Separate 2)Foam bubble 3)Slag Photo 3 Class ifi cat ion of foaming state |