Fuel injector having multiple rows of spray holes with different cross-sectional shapes for flow modulation

A nozzle body of a fuel injector, comprising:

• a proximal end;
• a distal end spaced longitudinally apart from the proximal end;
• and
• a first row of spray holes positioned at the distal end and a second row of spray holes positioned at the distal end longitudinally spaced apart from the first row of spray holes, the first row of spray holes including one or more spray holes having a uniform cross-sectional shape defined by a circle from an inlet end to an outlet end thereof and the second row of spray holes including one or more spray holes that include an inlet having a first cross-sectional shape and an outlet having a second cross-sectional shape different from the first cross-sectional shape, wherein a channel extending between the inlet and outlet in the second row of spray holes includes a transition in cross-sectional shape from the inlet to the outlet, wherein the first and second cross-sectional shapes of the one or more spray holes in the second row of spray holes are configured to reduce disproportionate flow of the fuel flow from the second row of spray holes relative to the first row of spray holes.