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| vtsteam:
I was trying to think why flame lickers run best once heated up, then. Maybe, it's the usual air cooling -- the hotter the engine the more differential of the fins to the air -- the faster the cooling heat exchange rate. Or, could be the opposite, in a very weak engine -- so little heat available that air cooling is overkill. I guess it depends on the engine which it is. |
| S. Heslop:
--- Quote from: vtsteam on August 15, 2014, 08:03:56 AM ---I was trying to think why flame lickers run best once heated up, then. Maybe, it's the usual air cooling -- the hotter the engine the more differential of the fins to the air -- the faster the cooling heat exchange rate. Or, could be the opposite, in a very weak engine -- so little heat available that air cooling is overkill. I guess it depends on the engine which it is. --- End quote --- I think I read once it's that when cold the water in the flame gasses can condense on the cylinder walls more. |
| Stilldrillin:
I like your way of thinking John! :clap: :clap: :thumbup: David D |
| fcheslop:
A similar set up was used on old gas as in town gas engines Some flame gulpers need pre heating because condensation on the port face prevents them venting well Polly enginering do a set of castings and a brief description is there catalogue page 23/24 http://www.pollymodelengineering.co.uk/sections/bruce-engineering/docs/Catalogue-oct-2013.pdf cheers |
| John Hill:
Thanks for the comments! The cylinder will be water jacketed and I have toyed with ideas for cooling the piston. I will probably pour in boiling water before starting. Vtsteam, I did some experiments with a tea light candle under a glass tumbler to judge the rate that a single flame used up oxygen and I concluded that that particular wont be a major problem. It will be interesting to learn what happens when air (including pilot light flame) is drawn at high velocity over the main fuel wick. Perhaps I should design in a variable size inlet port. Finding the best fuel may take some time. I have not chosen a material for the wick and when thinking about it I came up with another idea. If the wick was of suitable material it might stay alight for the entire cycle dying down to a smoulder when the valve closes and the oxygen is exhausted but flaring into full flame when the valve reopens and fresh air rushes in. Hmmmmm :coffee: |
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