Investigation on Combustion in Diesel Engines using a Constant Volume Combustion Chamber : Effect of initial Temperature

概要

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This paper presents some results or the experimental investigation on the effect of initial temperature on the diesel combustion processes carried out in a constant volume combustion chamber. The flollowing conclusions can be drawn from the experiments : (1)The initial temperature has an influence on ignition delay, illumination delay, pressure rise delay, first flame formation, brightness of flame and rate heat release. (2)As the initial temperature decreases, the flame formation can be observed as dark luminous dots and a unique combustion like twinkling stars can be found. (3)The empirical relationship between illumination delay τ_i and ignition delay τ_<id>, and initial pressure p_0, initial temperature T_0 and oxygen concentration φ can be presented by the following forms : τ_i , τ_<ed> ∝ p_0 ^nφ^cexp(B/T_0) .