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An Enperimental Study on the Steady Flow Characteristics Around An Intake Valve Using a Lda System
Published June 26, 1992 by Society of Automotive Engineers of Korea in South Korea
Event: KSAE Spring Conference
This experimental study is mainly investigated on the flow characteristics around the intake valve.
At first, the experiment of the air flow characteristics through an intake poppet valve-seat were studied.
In the second, the experiment of measurement of the mean velocity, turbulent intensity and turbulent kinetic energy around valve exit and in cylinder was dealt with.
Orifice flow meter was employed for the measurement of flow rate through an intake valve and LDA system was utilized and the data were treated by an on- line computer analyzing system.
Valve and seat used in experiment were constructed as the same shape of production DI diesel engine and magnify to the size of twice for the detailed measurement in vicinity of valve curtain area.
From the results of flow characteristics measurement through valve seat, there exists three flow patterns with the increase of its valve lifts. Measurement of the velocity at the valve exit shows that the normalized axial velocity distribution is independent of the flow rate.
The main jet angle of the valve jet is approach to valve seat angle as the flow rate increases.