IJE TRANSACTIONS A: Basics Vol. 26, No. 1 (January 2013) 73-82   

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A. Mohebbi, S. Jafarmadar, J. Pashae and M. Shirnezhad
( Received: August 19, 2012 – Accepted: October 18, 2012 )

Abstract    This paper presents the results of experimental work carried out to evaluate the distribution of cold and hot exhaust gas recirculation between cylinders in a DI diesel engine. The experiments have been conducted on a 3.99 liters turbocharged DI diesel engine under full load condition at 1900rpm in order to distinguish and quantify some effects of hot and cooled EGR with various rates on the EGR distribution and engine parameters. Experimental results showed that with increasing of EGR rate, unequal EGR distribution was increased in inlet port of cylinders while the reducing of EGR temperature (cooled EGR) improved this distribution and decreased the EGR cylinder-to-cylinder variations.


Keywords    Diesel Engine, Exhaust Gas Recirculation, EGR distribution, EGR temperature, Combustion, Emissions.


چکیده    در کار ارائه شده نتايج کار تجربی بررسی توزيع گازهای برگشت داده شده از اگزوز در سيلندر ها در دو حالت گرم و سرد برای يک موتور ديزلی پاشش مستقيم ارائه شده است. کارهای تجربی در موتور 99/3 ليتر توربوشارژ در حالت بار کامل و در دور 1900 دور بر دقيقه انجام شده است. گازهای برگشت داده شده در حالت سرد و گرم بوده و مقدار ان متغير می باشد. نتايج نشان می دهد که در مقدارهای پائين گازهای برگشتی و در دماهای پائين آن، توزيع اين گاز در بين سيلندر ها بهتر می شود. همچنين نتایج نشان می‌دهند که عملکرد و آلایندگی می توانند در دمای پائين و در درصدهای بالای گازهای برگشتی بخاطر توزيع يکسان بهبود داده شوند


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