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Dynamic Response of Fluid Transmission Lines.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Experimental frequency response data were obtained for straight pneumatic transmission lines of circular cross-section. Three 24 in. long lines with inside diameters of 0.041, 0.119 and 0.195 in. were tested at Reynolds numbers varying from 0 to 15000. The experimental data were compared with theoretical predictions obtained from the distributed parameter, small signal equations for the blocked and laminar mean flow cases. Several models were used to predict the effects of turbulent mean flow. The prediction capability and limitations of two turbulent flow models, that include the effects of the Reynolds number, but not frequency, were investigated and discussed. Methods for determining the end impedance of open and orifice terminated lines with mean flow were studied. The relatively simple approach of reflection coefficients gave satisfactory results for both choked and unchoked flow in orifices. The radiation impedance associated with open lines was found to be negligible for all test cases. Originator-supplied keywords include Fluidics, Fluid transmission lines, Frequency response, and Pneumatic transmission lines.
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