eng Science and Education Publishing Journal of Atmospheric Pollution 2381-2990 2017-08-11 5 2 40 46 10.12691/jap-5-2-1 JAP2017521 article Alireza Lotfi 1 Hassan Ghassemi gasemi@aut.ac.ir 2 Department of Marine Engineering, Imam Khomeini Naval University, Nowshahr, Iran Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran One of the important issues that today are considered by researchers as a research field is the study of combustion chamber in a variety of internal combustion engines. Different designs for the diesel engine combustion chamber are planned for this purpose. Open combustion chamber or direct injection and combustion chamber divided or indirect injection. Open combustion chamber or direct injection, which is widely used in heavy and industrial engines, and the combustion chamber divided in small engines with high revolution. The geometry of the combustion chamber in diesel engines (combustion ignition) has studied and discussed. http://pubs.sciepub.com/jap/5/2/1/jap-5-2-1.pdf combustion chamber direct injection emissions pollutants internal combustion engine