Ignition of Premixed n-heptane within Air by a Low Speed Motoring Compression

概要

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In this paper correlations of the ignition starting gas law temperature and molecular concentration instead of a critical compression ratio were obtained under the conditions ; premixed n-heptane and air, equivalence ratio (S) : 0.5〜3,mean piston speed : 1 m/sec, without residuals, lubricant : molybdenum-disulphide. The pressure was so high that the reaction was automatically led to a hot flame after τ_1 regime. Thrice stoichiometric charge also actively burnt consuming oxygen as well as at a stoichiometry, nevertheless pressure rise rate was less than that. Cool flame starting temperatures, ignition triggers, were in a narrow range of 400〜430℃ over S=0.5〜3. Shapes of indicator diagram are two-stage ignition at S=0.5,single stage ignition at S=2,3. At S=1,two-stage ignition obviously at the molecular concentration of 0.21 kmol/m^3,and at 0.43 Kmol/m^3 two-stage but similar to single stage ignition.
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