Spray Dynamic in Twin‐Fluid Atomizer with Tangentially Air Intake

This study presents an experimental investigation of a twin‐fluid air‐blast atomizer with tangential air entry, designed for fluid catalytic cracking (FCC) riser applications. An innovatively developed injector incorporating an impactor bolt is evaluated under varied operating conditions. Measurements reveal a nearly uniform mean droplet diameter across most of the spray field, distinguishing it from conventional designs, with noticeable deviations only at the periphery. The Sauter mean diameter (SMD) increases almost linearly toward the spray's outer zones, whereas the orientation of the impactor bolt exerts minimal influence on droplet velocity but induces slight variations in SMD. Based on the experimental data, separate empirical correlations are proposed for the non‐dimensional supply pressure ratio and SMD, enabling precise prediction of spray characteristics.