Swirl injector plunger

A fluid injector assembly extending along a longitudinal axis comprising:

• a housing;
• and
• an injector positioned within the housing, the injector comprising:
• an injector body having an interior cavity;
• a plunger positioned within the interior cavity of the injector body, the plunger having a plunger body, a fluid delivery passage along at least a portion of the plunger body, and a plunger tip positioned at a downstream end of the plunger body, wherein the fluid delivery passage comprises a longitudinal passage and at least one internal swirl passage, the at least one internal swirl passage being angled relative to the longitudinal axis and extending from the longitudinal passage to an opening upstream of the plunger tip;
• and
• a nozzle positioned at a downstream end of the injector body, the nozzle having at least one nozzle passage, wherein fluid is delivered from an upstream end of the injector to the at least one nozzle passage of the nozzle through the fluid delivery passage.