Abstract
The ignition or octane air mixture by rapid compression is 2nd stage ignition that follows the 1st stage ignition, within which the cool flame is observed, and the cool flame zone has been reported by D. Downs and R.W. Wheeler. The auther assured the existence of aldehyde in the exhaust gas, when fuel air mixture is compresed by motoring and compression ratio, cylinder head temperature or fuel air ratio are not sufficient to explode. Utilizing the solubility of aldehyde, the exthust gases were passed through the water. That solution was coloured by the reagent, and the moles of aldehyde were measured by means of photo-electric and colorimetric methods of analysis. Concentration of aldehyde measured by the above method represents well the degree of inactive combustion. Non-ignition curve in co-ordinates of aldehyde moles per cycle and fuel air ratio is convex for aldehyde co-ordinate and has a maximum point. The igniton curve has a steeper rate of increase and explodes before the max point.
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