Open AccessComparative Study of Performance and Emission Characteristics between Spark Ignition Engine and Homogeneous Charge Compression Ignition Engine (HCCI)
Author(s) -
Nahedh Mahmood Ali
Publication year - 2017
Publication title -
al-khwarizmi engineering journal/al-khwarizmi engineering journal
Language(s) - English
Resource type - Journals
eISSN - 2312-0789
pISSN - 1818-1171
DOI - 10.22153/kej.2016.06.003
Subject(s) - homogeneous charge compression ignition , automotive engineering , ignition system , carbureted compression ignition model engine , ignition timing , combustion , spark (programming language) , compression ratio , petrol engine , materials science , engine knocking , nox , octane rating , internal combustion engine , nuclear engineering , environmental science , combustion chamber , chemistry , engineering , computer science , thermodynamics , physics , programming language , organic chemistry
Many researchers consider Homogeneous Charge Compression Ignition (HCCI) engine mode as a promising alternative to combustion in Spark Ignition and Compression Ignition Engines. The HCCI engine runs on lean mixtures of fuel and air, and the combustion is produced from the fuel autoignition instead of ignited by a spark. This combustion mode was investigated in this paper. A variable compression ratio, spark ignition engine type TD110 was used in the experiments. The tested fuel was Iraqi conventional gasoline (ON=82).
The results showed that HCCI engine can run in very lean equivalence ratios. The brake specific fuel consumption was reduced about 28% compared with a spark ignition engine. The experimental tests showed that the emissions concentrations were reduced by 91.27% for NOx, 85.99% for CO, 78.91% for CO2, and 83.56% for unburned hydrocarbons compared to the SI engine. HCCI engine produced little noise with about 26.68% less than SI engine.