Adjusting mixture composition of alcohol-based fuels for improving combustion in a 0.99cc miniature IC engine

Experiment on the Influence of Residual Exhaust Gas on the Combustion Characteristics of a Miniature Engine with Platinum Wire Ignition

“…(In the evaluation criteria for combustion diagnosis, it is generally considered that if p mi of an individual cycle is less than one-third of the mean value of the continuously sampled test cycles, the individual cycle is regarded as a partial burning or misfiring cycle, where an individual cycle with p mi less than or close to zero must be a misfiring cycle. 20 ) Subsequently, the phenomenon of misfiring cycles whose values of p mi are almost close to zero disappears, and the combustion cycle gradually tends to stabilize. However, the values of p mi at this stage become lower than that of the early stages of ignition (from the beginning of the first ignition cycle to the end of the transitional cycles).…”

“…The p mi keeps a high value, but the cyclic variation in p mi becomes more severe and more misfiring cycles were found. (In the evaluation criteria for combustion diagnosis, it is generally considered that if p mi of an individual cycle is less than one-third of the mean value of the continuously sampled test cycles, the individual cycle is regarded as a partial burning or misfiring cycle, where an individual cycle with p mi less than or close to zero must be a misfiring cycle …”

“…For further scaling down miniature IC engine to a mesoscale, a 0.99 cm 3 miniature IC engine has been used for an in-cylinder combustion test. The results show that glow-ignition combustion under the micro-space conditions tends to produce abnormal combustion phenomena such as high cyclic variation, partial burning, and slow heat-release rate. , Micro-space combustion efficiency and combustion stability are still the key constraints for further reducing its structure to the mesoscale.…”