Effect of pulse exhaust pipe layout on exhaust interference of an 8-cylinder diesel engine
To solve the problem of exhaust interference in each cylinder of a certain inline 8-cylinder pulse turbocharged diesel engine,four types of exhaust pipe arrangements are designed.A diesel engine model is built using GT-Power software to analyze the effect of exhaust pipe arrangements on exhaust interference,and optimization and experimental verification are carried out.The results show that the layout and firing sequence of the exhaust pipes are the main factors of exhaust interference,and uneven sweeping of each cylinder is the direct cause of exhaust interference.The arrangement of exhaust pipes with a 4-row pipe structure,dual turbocharger channels,and a single channel exhaust interval with a crankshaft angle of 180°will result in higher exhaust pressure than intake pressure under low load conditions,resulting in uniform exhaust interference for each cylinder.At 25%rated load,the excess air coefficient abnormally decreases.After delaying the opening angle of the exhaust valve crankshaft from 120° to 140°,the excess air coefficient increases from 1.82 to 2.15,and the low-speed performance is significantly improved.
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