| Abstract |
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A flow coefficient measurement system which is operated under an unsteady intake flow condition in the intake port of a diesel engine cylinder head was developed. In order to determine the actual engine intake flow condition, the valve lift of the intake valve, whose rod is in contact with the camshaft, is varied continuously by rotating the camshaft directly. While varying the rotation speed of the camshaft, the flow coefficients were calculated by measuring various sensor signals, in this case the surge tank pressure, differential pressure in the flow meter, the valve lift when synchronized with the camshaft angle position, and the intake air temperature. The measurement of the flow coefficient was automated using a DAQ board and a computer. The flow coefficients change with the valve lift, and the effects of inertia of the intake flow on the flow coefficients are identified. The mean flow coefficients are obtained by integrating flow coefficients over the camshaft angle position. |
