Homogeneous Charge Compression Ignition (HCCI) and by Hua Zhao

By Hua Zhao

HCCI/CAI has emerged as essentially the most promising engine applied sciences with the aptitude to mix gas potency and more suitable emissions functionality. regardless of the significant merits, its operational variety is very constrained and controlling the combustion (timing of ignition and cost of power unlock) continues to be a space of on-going study. even if, advertisement purposes are on the subject of fact. This booklet stories the main overseas study on optimising its use, together with gas HCCI/CAI engines; diesel HCCI engines; HCCI/CAI engines with replacement fuels; and complicated modelling and experimental strategies.

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Extra resources for Homogeneous Charge Compression Ignition (HCCI) and Controlled Auto Ignition (CAI) Engines for the Automotive Industry

Example text

Trends indicate that timing is affected more by EGR dilution than by air dilution at low to moderate EGR rates (0–40%). At EGR rates beyond 40%, timing increasingly becomes dependent on lambda. It is also found that the percentage of knocking cycles is independent of ignition timing but strongly affected by the fuel rate. That is, as fuel rate is increased for constant EGR rate at the knock boundary, ignition timing remains constant despite heavier knocking combustion. This is different from SI combustion, where ignition timing is one of the most important variables that determines whether engine knock occurs.

In an idealised HCCI/CAI combustion process, combustion reactions take place simultaneously in the cylinder and all the mixture participates in the heat release process at any instant of the combustion process. e. 1 Heat release characteristics of SI, CAI/HCCI and CI combustion. Q= ∫ K m ⋅ dq i 1 where K is the total number of heat release reactions, and qi is the heat released from the ith heat release reaction involving per unit mass of fuel and air mixture. Whereas the entire heating value of each minute parcel of mixture must be released during the finite duration spend in the reaction zone in a SI engine, heat release takes place uniformly across the entire charge in an idealised HCCI/CAI combustion.

Q= ∫ K m ⋅ dq i 1 where K is the total number of heat release reactions, and qi is the heat released from the ith heat release reaction involving per unit mass of fuel and air mixture. Whereas the entire heating value of each minute parcel of mixture must be released during the finite duration spend in the reaction zone in a SI engine, heat release takes place uniformly across the entire charge in an idealised HCCI/CAI combustion. However, in practice, due to inhomogeneities in the mixture composition and temperature distributions in a real engine, the heat release process will not be uniform throughout the mixture.

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