Diagnostics for research in atomization and turbulent two-phase flows. Annual report, 31 July 1986-31 July 1987
Innovative techniques for obtaining particle size and velocity are being investigated. The four methods are: phase-Doppler, ratiometric light-scatter detection, Lagrangian-frame particle analyzer, and scattered-light heterodyne interferometry. Although these methods have overlapping capabilities, each offers additional possibilities for providing heretofore unavailable data. The phase-Doppler method has been highly refined and provides reliable particle size and velocity measurements. However, research has been required on the light scattering mechanisms due to nonuniform-light-scattering theory and experimental observations have required the expansion of the theory to include the affects of nonuniform illumination. Under certain conditions, the detection of refracted light where none is predicted, remains as a question to be resolved. These questions apply to all of the methods addressed. However, the ratiometric techniques may be used in the on-axis forward scatter light detection mode. This will allow the measurement of irregular-shaped particles moving at high speed using light configuration, the system is limited to dilute particle fields. Currently, the theoretical analysis and optical configuration have been completed and preliminary tests have shown that the basic concept will work. Interests in turbulent dispersion of spray drops suggested the need for measuring the particle dynamics in a Lagrangian frame. The method described promises to provide tracking of individual drops and measuring their local size and velocity. Array detectors are being investigated to provide adequate speed, sensitivity, and spatial resolution. The transmitter optics have been defined.
- Research Organization:
- Aerometrics, Inc., Mountain View, CA (USA)
- OSTI ID:
- 5484701
- Report Number(s):
- AD-A-187338/9/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ATOMIZATION
MEASURING METHODS
TURBULENT FLOW
TWO-PHASE FLOW
DETECTION
INTERFEROMETRY
LIGHT SCATTERING
OPTICS
PARTICLE SIZE
PARTICLES
PROGRESS REPORT
RELIABILITY
RESOLUTION
SPATIAL DISTRIBUTION
SPRAYS
TURBULENCE
VELOCITY
DISTRIBUTION
DOCUMENT TYPES
FLUID FLOW
SCATTERING
SIZE
420400* - Engineering- Heat Transfer & Fluid Flow