Ballistic Imaging of Liquid Breakup Processes in Dense Sprays
Abstract
This report results from a contract tasking Lund Institute of Technology as follows: A high quality spray in cross-flow rig will be assembled. Our objectives are to build an atmospheric pressure channel with a length/wetted diameter ratio around 30 for a well developer air flow. We will inject water with Weber numbers in the range 50 - 300. Ballistic imaging will be applied to the jet core, while PIV/LDA will be used to describe the air flow. PDA will be applied to the dilute region of the spray and high-speed shadowgraphy will be used to observe the overall spray behavior. The data to be acquired include upstream dynamics of the air (images of velocity and vorticity via PIV and statistical moments via LDA), breakup dynamics (primary breakup and droplet characterization) of the jet in the near field (via ballistic imaging), droplet sizes and fluxes via PDA, and overall jet behavior via fast-framing shadowgraphy. The fast framing camera will be used in the event that oscillations in the core are imposed upon the free stream. A detailed database over a rage of Weber and Reynolds numbers, suitable for model validation, will be prepared and presented in several publications. If possible (if it can be fitted), an aerated injector, as used by AFRL, will also be evaluated. While operation with water at atmospheric pressure is not the same as operation with real fuels at realistic pressures, this work will produce a complete database that can be used to develop better understanding. Tests of more realistic systems can follow in coming years. Currently the only fully functional ballistic imaging system for spray studies is located at Lund.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 24, 2009
- Accession Number
- ADA521110
Entities
People
- David Sedarsky
- Edouard Berrocal
- Mark A. Linne
- Megan Paciaroni