Many research groups investigated the flow field in the intake
tract of an internal combustion engine, since the generated flow
structures effect the fuel mixing in the cylinder and therefore the
performance of the engine. A fewer number of investigations treat
the flow in the exhaust port. The experimental flow visualization of
the exhaust port flow is challenging due to the complex, confined
geometry. Nevertheless, the flow field has been exposed by several
researchers, as e.g. [11]. Tanaka [12] investigated the flow in a