Accession Number:

ADA193892

Title:

Combustion Studies of Acoustically Suspended Liquid Droplets.

Descriptive Note:

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1988-03-01

Pagination or Media Count:

45.0

Abstract:

A piezoelectrically driven ultrasonic resonator was developed and tested in this study. The device was used to levitate liquid fuel droplets for evaporation measurements and ignition studies. The final report describes the resonator and its operating characteristics, gives a brief review of the literature, and presents the results of various ignition tests. No successful minimum perturbation ignition method was discovered among the several explored. It is the authors opinion that the acoustic levitation technique may hold some promise for conducting non-combustion related droplet measurements, for example evaporation tests, but without further development of the technique combustion experiments will be difficult to be accomplished. Minimum developmental needs will be for a high temperature, high pressure chamber and a feedback positioning controller. However, even with such additional features there is some doubt whether stable levitation of a burning droplet can occur. Keywords Ultrasonic resonator Acoustic levitation.

Descriptors:

• *IGNITION
• *RESONATORS
• *ULTRASONICS
• CHAMBERS
• COMBUSTION
• CONTROL SYSTEMS
• DROPS
• EVAPORATION
• FEEDBACK
• FUELS
• HIGH PRESSURE
• HIGH TEMPERATURE
• LIQUIDS
• MEASUREMENT
• PERTURBATIONS
• POSITION(LOCATION)
• SUSPENSION DEVICES
• POSITIONING DEVICES(MACHINERY)

Subject Categories:

• Acoustics
• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE