Cavitation Inside High-Pressure Optically Transparent Fuel Injector Nozzles
Artikel i vetenskaplig tidskrift, 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.

Nozzles

Design

Cavitation

Spray nozzles

Drop breakup

Fuel injection

Reynolds number

Finite element method

Orifices

Författare

Zachary Falgout

Chalmers, Tillämpad mekanik, Förbränning

Mark Linne

Chalmers, Tillämpad mekanik, Förbränning

Journal of Physics: Conference Series

1742-6588 (ISSN)

Vol. 656 1 012082

Ämneskategorier

Strömningsmekanik och akustik

DOI

10.1088/1742-6596/656/1/012082

Mer information

Skapat

2017-10-07