Abstract
To improve engine power and reduce exhaust emissions of 4-valve, high-speed DI diesel engines, the intake swirl ratio must be controlled according to the engine operating conditions. This paper discusses a variable swirl intake port consisting of helical port and tangential port with a swirl control valve. The swirl flow characteristics were analyzed on the basis of steady-state air flow tests and 3-dimensional computations. An automesh generator for numerical analysis of twin intake ports was developed to facilitate these computations. The results indicate that the total performance of twin ports can be estimated from that of a single port and that there were no adverse effects from interaction of the port flows in the cylinder.
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