Oscillating Flows in Inlets of Pulse Detonation Engines

Oscillating Flows in Inlets of Pulse Detonation Engines

Filtered Rayleigh Scattering Velocimetry Accuracy Investigation in a M=2.22 Axisymmetric Jet Jonas Gustavsson Corin Segal Mechanical and Aerospace Engineering University of Florida January 2004

Purpose of study Measure the accuracy of FRS for high-speed flow velocimetry in a realistic flow situation Identify and quantify dominating sources of uncertainty

Propose ways of reducing total uncertainty Experimental setup Axisymmetric 11 mm M=2.2 Free jet Well-known flow with suitable Mach number range

No optical access issues Comparison to pressure probe surveys possible current setup Eggers 1966 Pitot survey Experimental setup

Experimental setup Experimental procedure Sets of images Ambient light White field

Dot card Iodine cell calibration Jet images Iodine cell calibration 4.4 V

4.3 V 4.2 V Uneven seeding Unfiltered image

Transmission image Results Uncertainty sources

Laser drift 3h 35 m/s Image overlap 0.15 pixels 10 m/s Shot noise 10 m/s Finite spectral width 10 m/s

Total uncertainty: 40 m/s Conclusions FRS is a viable velocity measurement technique in a practical flow situation Water vapor condensation limits light

collection shot noise, but droplets track flow well Laser drift dominates, but several sources contribute O(10 m/s) Total estimated error 40 m/s agrees well with experimental data

Future work Improve the accuracy through better laser wavelength control. Develop methods for analyzing data from FRS in unevenly, moderately seeded flows. Assess FRS for simultaneous

measurement of velocity and temperature in high-speed combustion flows. The End

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