Quantitative NO{sub 2} molecular tagging velocimetry at 500 kHz frame rate
- Departments of Mechanical and Aerospace Engineering, Ohio State University, Columbus, Ohio 43210 (United States)
NO{sub 2} molecular tagging velocimetry (MTV) is demonstrated at repetition rates as high as 500 kHz in a laboratory scale Mach 5 wind tunnel. A pulse burst laser and a home built optical parametric oscillator system were used to simultaneously generate the required 355 and 226 nm wavelengths for NO{sub 2} photodissociation (tagging) and NO planar laser induced fluorescence imaging (interrogation), respectively. NO{sub 2} MTV images were obtained both in front and behind the characteristic bow shock from a 5 mm diameter cylinder. From Gaussian curve fitting, an average free stream flow velocity of 719 m/s was obtained. Absolute statistical precision in velocity of {approx}11.5 m/s was determined, corresponding to relative precision of 1.6%-5%, depending upon the region of the flow probed.
- OSTI ID:
- 21518186
- Journal Information:
- Applied Physics Letters, Vol. 97, Issue 22; Other Information: DOI: 10.1063/1.3522654; (c) 2010 American Institute of Physics; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
CHEMICAL ANALYSIS
CYLINDERS
DISSOCIATION
FLUORESCENCE
KHZ RANGE
LASER RADIATION
NITRIC OXIDE
NITROGEN DIOXIDE
PARAMETRIC OSCILLATORS
PHOTOLYSIS
PULSES
SHOCK WAVES
STREAMS
VELOCIMETERS
VELOCITY
WAVELENGTHS
WIND TUNNELS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION
EQUIPMENT
FREQUENCY RANGE
LUMINESCENCE
MEASURING INSTRUMENTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OSCILLATORS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTON EMISSION
RADIATIONS
RIVERS
SURFACE WATERS