The best flow field of a free jet should feature high velocity and an unobvious shield effect, entirely depending on the ratio of expansion
ratio and inlet pressure.
The exception being that the ratio of expansion
stroke to in-cylinder effective compression stroke is higher than the baseline.
The volume of the cylinder at the exhaust angle ([[theta].sub.d]), shown in the following equation, is relevant to the volume of the cylinder at the closed angle of suction and the ratio of expansion