ガソリン機関の混合気形成に関する研究 : 定常流実験によるバルブ環状通路のLDV噴霧計測

概要

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Gasoline fuel droplet size, velocity and spatially relative frequency were measured at an intake valve annular passage with an LDV, which has been equipped with a droplet size analyzer. The analyzer acquires the light intensity scattered by a droplet and the number of Doppler Burst waves. In this paper, the effects of fuel injector location on droplets at the valve passage, which play a great role in fuel mixture formation, have been investigated. Fuel was injected to a poppet valve near the valve, and in the other case, to the intake port 100mm upstream of the valve. The droplets enter from the confined valve periphery even in the upstream injection case. The SMD at the high frequency position is small in the upstream injection, but is large in the valve injection case. This is explained by the difference in airflow and droplet size. The delay time of droplet appearance at the valve passage from the injection start is different in these cases and drastically effects fuel mixture formation.
一般社団法人日本機械学会の論文
1990-10-25