Cavitation Inside High-Pressure Optically Transparent Fuel Injector Nozzles
Paper in proceeding, 2015

Nozzle-orifice flow and cavitation have an important effect on primary breakup of sprays. For this reason, a number of studies in recent years have used injectors with optically transparent nozzles so that orifice flow cavitation can be examined directly. Many of these studies use injection pressures scaled down from realistic injection pressures used in modern fuel injectors, and so the geometry must be scaled up so that the Reynolds number can be matched with the industrial applications of interest. A relatively small number of studies have shown results at or near the injection pressures used in real systems. Unfortunately, neither the specifics of the design of the optical nozzle nor the design methodology used is explained in detail in these papers. Here, a methodology demonstrating how to prevent failure of a finished design made from commonly used optically transparent materials will be explained in detail, and a description of a new design for transparent nozzles which minimizes size and cost will be shown. The design methodology combines Finite Element Analysis with relevant materials science to evaluate the potential for failure of the finished assembly. Finally, test results imaging a cavitating flow at elevated pressures are presented.

Cavitation

Design

Finite element method

Orifices

Nozzles

Drop breakup

Fuel injection

Reynolds number

Spray nozzles

Author

Zachary Falgout

Chalmers, Applied Mechanics, Combustion and Propulsion Systems

Mark Linne

Chalmers, Applied Mechanics, Combustion and Propulsion Systems

Journal of Physics: Conference Series

17426588 (ISSN) 17426596 (eISSN)

Vol. 656 1 012082

9th International Symposium on Cavitation, CAV 2015
Lausanne, Switzerland,

Subject Categories

Fluid Mechanics and Acoustics

DOI

10.1088/1742-6596/656/1/012082

More information

Latest update

7/12/2021