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Tyler, R.A. (author), Williamson, R.G. (author)An empirical approach is used to correlate the mixing of isothermal incompressible coaxial air flows in straight pip es of constant circular cross-section. An assumed decay function for kinetic momentum is correlated in terms of initial geometry and initial velocities of the mixing streams. The method allows the rapid estimation of quantities of...report 1980
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Tyler, R.A. (author), Williamson, R.G. (author)Balance measured force data are presented for a series of thrusting fan configurations (tip dia. 15") operated in cross-flow, at 900 incidence, in the 10 ft. x 20 ft. N.R.C. V/STOL Propulsion Tunnel. Test conditions involved tunnel speeds from 30 to 130 ft.jsec. in combination with mean intake velocities from 100 to 400 ft./sec. The force data...report 1970
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- Tyler, R.A. (author), Williamson, R.G. (author) report 1970
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Tyler, R.A. (author)A compact form of thrust deflector, of possible application to existing turbofans, is described. The use of the deflector in various roles is discussed. The basic design allows, in principle, continuous variation of deflection from zero to design maximum with no effect on upstream flow conditions. In addition no upstream flow distortion should...report 1975
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- Tyler, R.A. (author), Williamson, R.G. (author) report 1970
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Tyler, R.A. (author), Williamson, R.G. (author)Data, relating mainly to mean total pressure 1055, in inclined flow, are presented for a series of five circular intakes with common centre- body (0.5 diameter ratio) and employing semi-circular lip profiles. Lip radius to intake, radius ratios were 0 . 10, 0 . 15, 0 . 20, 0 . 25 and 0 . 30 . Measurements were made at velocity ratios up to 2 .0...report 1965
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Tyler, R.A. (author), Williamson, R.G. (author)Experimental data are presented, re lating ta the operation under inclined flow conditions of a two-stage fan of high thrust loading (800 lb./sq. ft.) enclosed, in a cowled intake.The intake configurationhad been investigated previously, in the absence of the fan, over a similar range of intake velocity ratio and cross-flow angle (Ref. 1). The...report 1966
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Tyler, R.A. (author), Williamson, R.G. (author)Inclined single and paired jets were operated through the regime of floor vortex formation in the NRC 10-ft x 20-ft V/STOL propulsion tunnel. Observed floor stagnation positions are correlated in terms of a jet force coefficient. Limiting conditions for vortex formation (incipient stagnation) are derived for a wide range of jet inclination to...report 1971
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Tyler, R.A. (author), Williamson, R.G. (author)A simple analytical expression relating exit and entry distortion factor. VMAX/VMEAN' for a conical-type diffuser is derived. The expression involves two assigned constants, values for which are obtained from a quantitative fit of measured data for a series of six conical diffuser configurations. operated with cross-flow generated inflow...report 1973
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Tyler, R.A. (author), Williamson, R.G. (author)The effects of flow rates appropriate to engine requirements through slotted intakes in the rear upper surface of a thick wing were investigated. The basic test configuration incorporated a 31.5 percent thick aerofoil of 3-ft chord and 4-ft span. The aerofoil was equipped with a wide (5 percent chord), fun span intake slot, located at 65 percent...report 1968
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Tyler, R.A. (author), Williamson, R.G. (author)Data relating to mean total pressure loss and flow distortion in full-scale circular intakes under cross- flow conditions are presented for a range of cowl lip profiles. Five cowl shapes were tested over a range of velocity ratio from 0 te 0.7 and at cross - flow angles from 0 to 165 degrees. Boundaries were established between the regime in...report 1964
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Tyler, R.A. (author)This report contains a brief description of an aircraft power plant arrangement of the turbofan type which bas been the subject of some considerable analytical and design assessment during the past nine months and is believed to be of potential value in tbe civil STOL/VTOL aircraft application.report 1960
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Tyler, R.A. (author), Williamson, R.G. (author)Single jets were directed towards, and perpendicular to, the boundary of the 10-ft x 20-ft test section of the NRC V/STOL Propulsion Tunnel. The position of tunnel flow separation, arising from jet impingement and forward penetration, was determined from wool tuft observations for various conditions of jet geometry, jet velocity, and tunnel...report 1970
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Hut, R.W. (author), Tyler, S. (author), Van Emmerik, T.H.M. (author)A prototype temperature sensing pair of waders is introduced and tested. The water temperature at the stream-bed is interesting both for scientist studying the hyporheic zone as well as for, e.g., fishers spotting good fishing locations. A temperature sensor incorporated in waders worn by members of the public can give scientists an additional...journal article 2015
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Hut, R.W. (author), Tyler, S. (author), Van Emmerik, T.H.M. (author)A prototype temperature-sensing pair of waders is introduced and tested. The water temperature at the streambed is interesting both for scientists studying the hyporheic zone and for, e.g., fishers spotting good fishing locations. A temperature sensor incorporated into waders worn by members of the public can give scientists an additional source...journal article 2016
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- Selker, J.S. (author), Tyler, S. (author), Van de Giesen, N.C. (author) journal article 2014
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Van de Giesen, N.C. (author), Steele-Dunn, S.C. (author), Jansen, J. (author), Hoes, O.A.C. (author), Hausner, M.B. (author), Tyler, S. (author), Selker, J. (author)Over the past five years, Distributed Temperature Sensing (DTS) along fiber optic cables using Raman backscattering has become an important tool in the environmental sciences. Many environmental applications of DTS demand very accurate temperature measurements, with typical RMSE < 0.1 K. The aim of this paper is to describe and clarify the...journal article 2012
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Sayde, C. (author), Gregory, C. (author), Gil-Rodriguez, M. (author), Tufillaro, N. (author), Tyler, S. (author), Van de Giesen, N.C. (author), English, M. (author), Cuenca, R. (author), Selker, J.S. (author)Accurate methods are needed to measure changing soil water content from meter to kilometer scales. Laboratory results demonstrate the feasibility of the heat pulse method implemented with fiber optic temperature sensing to obtain accurate distributed measurements of soil water content. A fiber optic cable with an electrically conductive armoring...journal article 2010
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Hausner, M.B. (author), Suarez, F. (author), Glander, K.E. (author), Van de Giesen, N.C. (author), Selker, J.S. (author), Tyler, S.W. (author)Hydrologic research is a very demanding application of fiber-optic distributed temperature sensing (DTS) in terms of precision, accuracy and calibration. The physics behind the most frequently used DTS instruments are considered as they apply to four calibration methods for single-ended DTS installations. The new methods presented are more...journal article 2011
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Huwald, H. (author), Selker, J.S. (author), Tyler, S.W. (author), Calaf, M. (author), Van de Giesen, N.C. (author), Parlange, M.B. (author)The movement of air in natural porous media is complex and challenging to measure. Yet gas transport has important implications, for instance, for the evolution of the seasonal snow cover and for water vapor transport in soil. A novel in situmulti-sensor measurement system providing high-resolution observation of gas transport in snow is...journal article 2012
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