A CI engine with bore has the fuel injectors mounted in the center of the cylinder head. The injectors have a nozzle diameter of 0.073 mm, a discharge coefficient of 0.72, and an injection pressure of...

A CI engine with bore has the fuel injectors mounted in the center of the cylinder head. The injectors have a nozzle diameter of 0.073 mm, a discharge coefficient of 0.72, and an injection pressure of 50 MPa. Average cylinder pressure during injection can be considered 5000 kPa. Density of the diesel fuel is 860kg/m³.

Calculate:

(a) Average velocity of the fuel jet as it leaves the injector. [m/sec]

(b) Time for a fuel particle to reach the cylinder wall if it travels at average exit velocity. [sec]