Abstract
Modern fuel injection systems operate at high pressures and flow velocities. Injectors can be pressurized in excess of 10 MPa, resulting in fuel velocities on the order of hundreds of meters/second in the mm and sub-mm internal confines of a fuel injector. Subsequent ejection velocities at the nozzle yield characteristic atomization droplet size distributions and spread angles. Studies have shown or inferred the presence of cavitation in such fuel injectors, typically beneficially decreasing ejection droplet sizes while increasing the spray spreading angle. While beneficial for fuel atomization, it is known that bubble collapse near a solid surface produces a strong jet which impinges on the surface and causes erosion. In this study, Fourier based image reconstruction is used to perform Passive Cavitation Imaging (PCI) in laboratory nozzles to detect, characterize, and most importantly localize inertial cavitation. [Work funded by DOE.]
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