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Seed particle response and size characterization in high speed flowsThe response of seed particles ranging between 0.7 and 8.7 micron is determined using a phase Doppler particle analyzer which simultaneously measures particle size and velocity. The stagnant seed particles are entrained into a high speed free jet at velocities ranging from 40 to 300 m/s. The size-mean axial velocity correlation and size-rms velocity correlations are used to determine the particle response to the sudden acceleration. It was determined that at the lower speeds, seed particles up to approximately 5 microns are adequate, but as velocities approach 300 m/s only particles on the order of one micron are suitable. The ability to determine size and velocity simultaneously is essential if seeding with polydispersions is used since it allows the rejection of data which will not accurately represent the flow field.
Document ID
19930039814
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rudoff, Roger C.
(NASA Ames Research Center Moffett Field, CA, United States)
Bachalo, William D.
(Aerometrics, Inc. Sunnyvale, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Laser anemometry - Advances and applications 1991; Proceedings of the 4th International Conference, Cleveland, OH, Aug. 5-9, 1991. Vol. 2 (A93-23776 08-35)
Publisher: American Society of Mechanical Engineers
Subject Category
Aerodynamics
Accession Number
93A23811
Funding Number(s)
CONTRACT_GRANT: NAS2-13300
CONTRACT_GRANT: NAS2-13286
Distribution Limits
Public
Copyright
Other

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