| OCR Text |
Show BASIC EXPERIMENTS AND SIMULATIONS In order to optimize of the design of the sludge slagging combustor , Kobe Steel conducted a number of experiments and simulations. COLD MODEL TEST In order to investigate the flow -patten in the combus tor , a one- fi ftieth scale cold flow model was built and tested. Fig. 2 shows the influence of the ratio of primary to secondary air flowrate on the flow -pattern in the combustor. The lower the ratio of primary to secondary air flowrate, the stronger the swi r l produced in the combustor. On the other hand , the higher the ratio of primary to secondary air flowrate , the larger the recirculation zone generated in the center of the combus tor. The reason considered to be as follows; The higher the ratio of primary to secondary air flowrate , the higher the percentage of primary air that is pressed against the wall. This creates a large area of negative pressure in the center of the combustor and therefore a larger area of recirculation in the center of the combustor. On the other hand , the lower the ratio of primary to secondary air flowra te, the larger the amount of secondary air that flows adhered to the wall and prevents the pr imary air from being pressed against the wall and thus the small er the area of recirculation that is generated in the center of the combustor. Primary : Secon Air Air 4 I Cross Section A-A Primary: Secondary Air Air I 4 • 0 Secondary Air .. A A "'~¥,. , < ~ , ... + , I <' , • ,I (' ... I , , <:) , , \ ~ < .. , ~ < -. ~ , '" <' I I ... 1 I ; I ' ,, ~I"; I IV ~ " ... .... , r ....... .... - , t IfI' .... - ...... - , . ,. - .. - - ' tll'-- --- ---''..r'---- ....... ,... - . Fig.2 Influence of the ratio of primary to secondary air flowrate on a flow pattern . - 3 - |
