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In this work, an experimental investigation was conducted in order to study the effect of air injection into inlet air manifold on the transient performance of turbocharged diesel engine at different operating conditions. The experimental work was performed on a test rig comprising a four stroke 5.67 liters water-cooled turbocharged diesel engine and a Heenan hydraulic dynamometer. Instrumentation included devices for measuring engine speed, load, exhaust smoke level, turbocharger speed, and inlet air manifold pressure. The test facility was provided with a computer controlled data acquisition system to enable fast and accurate measuring and evaluating the engine response to sudden demand of increased load or speed. The air injection system was designed, manufactured and erected on the engine to permit air injection at 2, 4, and 6 bar into the sir inlet manifold. The effect of air injection at different injection pressure was investigated when the engine is subjected sudden acceleration demands from 1000 rpm to the target speed corresponding to maximum rack travel at initial loads of 10, 30 and 50 %. Also, the effect of air injection at different injection pressure was investigated when the engine is subjected sudden load when the fuel pump control lever was locked at its initial setting at initial speed of 2000 rpm and initial load of 20, 40 and 50% from the engine full load then the load was increased suddenly to its maximum value. It is shown that the response time at which the engine speed reach to the desired value correspond to full fuel pump rack position decreases with the increase of the air injection pressure at different initial loads. Also it was noticed that the response time at which the engine load reach to the engine maximum load decreases with the increase of air injection pressure at different initial loads.

international conference on aerospace sciences and aviation technology/international conference on aerospace science and aviation technology

Experimental Investigation of the Effect of Air Injection into Inlet Air Manifold on the Transient Performance of Turbocharged Compression Ignition Engine at Different Operating Conditions