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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoPlainText>Dear Jock<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>>When I read your "In the time-temperature-turbulence equation" lights went off. <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I would rather hear they went on.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>You are quite correct in your analysis, though be careful about generalising on the other approach.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>>I expect this is why my iCans with three washers as deflectors, in contra distinction to a "concentrator ring", burn cleaner.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Correct, with the proviso that the concentrator ring could be better it is broke the incoming (lateral) flow towards the centre into jets. The point is to get turbulence while not shortening the residence time 'at temperature'. The easiest way improve the concentrator ring is not to have one in the first place, but to create the same effect using hot secondary air jets. The result is you can drop fuel in without hindrance and there is one less part to make.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>If the ring is a necessity, make it using a concertina-forming tool so the gas flow is divided. Anything to make it <i>not</i> be a smooth flow like water going down a round hole with a radiused edge. <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>This is particularly important when the excess air level is low because it is hard for the H and C to find O2 when it is in short supply without turbulence.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>>They are essentially soot free. Perhaps "soot free" should be a goal?<o:p></o:p></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Correct again. <o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Regards<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'>Crispin<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p></div></body></html>