The swirl ratio at the end of induction at 2000 rev/min in a direct-injection diw engine of bore I stroke = 100 mm is 4.0. What is the average tangential velocity (evaluated at the inlet valve-axis...

The swirl ratio at the end of induction at 2000 rev/min in a direct-injection diw engine of bore I stroke = 100 mm is 4.0. What is the average tangential velocity (evaluated at the inlet valve-axis radial location) required to give this swirl ratio? What is the ratio of this velocity to the mean piston speed and to the mean flow velocity through the inlet valve estimated from the average valve open area and open time?