This paper investigates the spray characteristics of throttleable pintle injectors, focusing on their application in propulsion systems. Pintle injectors have gained significant attention in rocket engine development due to their superior atomization and throttling ability. The research aims to analyze the internal flow dynamics and atomization behavior of these injectors, particularly focusing on how this influences spray performance. A 2D axisymmetric geometry has been constructed to employ the Eulerian approach for examining the liquid sheet thickness and velocity at the pintle opening across different pintle opening distances. The results demonstrate that pintle opening distance has an effect on the flow parameters like fluid velocity and impact on fuel–air mixing using water and air as simulants. The findings highlight the potential for optimizing injector designs by manipulating pintle opening distance, offering valuable insights for advanced injector development in aerospace applications for liquid rocket engines.