Effect of free-radical release on diesel ignition delay under simulated cold-starting conditions

摘要: Abstract Peak compression temperatures typical of those achieved when cranking a cold diesel engine can be produced by running gasoline ratio 7.5, with block temperature 100°C. Under the chosen operating conditions, fuel cetane index 43 would ignite only very feebly, ignition delays in excess about 9 ms, but presence various additives, iso-octyl nitrate, di-tert-butyl peroxide, tert-butyl perbenzoate, 1,1-di-(tert-butylperoxy) cyclohexane, and 3,3,5-trimethyl between 3 7 ms were observed; although thermal decomposition rates these additives span approximately factor 60, do not correlate rates. Some measurements made on effect diethyl ether, either blended or bled into air intake: its efficacy as cold-starting aid stems from fact that etherair mixtures spontaneously during stroke, thereby causing to well.