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  • Aeronautics (General)  (2)
  • Sea level  (2)
  • Thermohaline circulation  (2)
  • 2005-2009  (6)
  • 1960-1964
  • 1955-1959
  • 1
    Publication Date: 2019-07-11
    Description: An experimental investigation was conducted to study the effects of 2-, 5-, 10-, and 22.5-min ice accretions on the aerodynamic performance of a swept finite wing. The ice shapes tested included castings of ice accretions obtained from icing tests at the NASA Glenn Icing Research Tunnel (IRT) and simulated ice shapes obtained with the LEWICE 2.0 ice accretion code. The conditions used for the icing tests were selected to provide five glaze ice shapes with complete and incomplete scallop features and a small rime ice shape. The LEWICE ice shapes were defined for the same conditions as those used in the icing tests. All aerodynamic performance tests were conducted in the 7- x 10-ft Low-Speed Wind Tunnel Facility at Wichita State University. Six component force and moment measurements, aileron hinge moments, and surface pressures were obtained for a Reynolds number of 1.8 million based on mean aerodynamic chord and aileron deflections in the range of -15o to 20o. Tests were performed with the clean wing, six IRT ice shape castings, seven smooth LEWICE ice shapes, and seven rough LEWICE ice shapes. Roughness for the LEWICE ice shapes was simulated with 36-size grit. The experiments conducted showed that the glaze ice castings reduced the maximum lift coefficient of the clean wing by 11.5% to 93.6%, while the 5-min rime ice casting increased maximum lift by 3.4%. Minimum iced wing drag was 133% to 3533% greater with respect to the clean case. The drag of the iced wing near the clean wing stall angle of attack was 17% to 104% higher than that of the clean case. In general, the aileron remained effective in changing the lift of the clean and iced wings for all angles of attack and aileron deflections tested. Aileron hinge moments for the iced wing cases remained within the maximum and minimum limits defined by the clean wing hinge moments. Tests conducted with the LEWICE ice shapes showed that in general the trends in aerodynamic performance degradation of the wing with the simulated ice shapes were similar to those obtained with the IRT ice shape castings. However, in most cases, the ice castings resulted in greater aerodynamic performance losses than those obtained with the LEWICE ice shapes. For the majority of the LEWICE ice shapes, the addition of 36-size grit roughness to the smooth ice shapes increased aerodynamic performance losses.
    Keywords: Aeronautics (General)
    Type: PB2005-110681
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: Preliminary measurements of local and total densities inside ice shapes were obtained from ice shapes grown in the NASA Glenn Research Tunnel for a range of glaze ice, rime ice, and mixed phase ice conditions on a NACA 0012 airfoil at 0 angle of attack. The ice shapes were removed from the airfoil and a slice of ice 3 mm thick was obtained using a microtome. The resulting samples were then x-rayed to obtain a micro-radiography, the film was digitized, and image processing techniques were used to extract the local and total density values.
    Keywords: Aeronautics (General)
    Type: NASA/TM-2005-213440 , E-14976 , AIAA Paper 2005-0657 , 43rd AIAA Aerospace Sciences Meeting and Exhibit; Jan 10, 2005 - Jan 13, 2005; Reno, NV; United States
    Format: application/pdf
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  • 3
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Publication Date: 2021-05-19
    Description: Usando series de tiempo de promedios diarios de nivel del mar en años caracterizados por la ocurrencia de eventos El Niño en la estación mareográfica de La Libertad (02°15'S-81°27'W), se aplicaron las técnicas del análisis espectral para determinar la correlación existente entre los eventos pasados y el primer semestre de 1997. Se obtuvieron niveles significativos de coherencia entre el evento El Niño 1982-1983 con el evento del 1997. El análisis espectral comparativo permitió obtener las ondas predominantes, la amplitud y el ángulo de fase de cada una de ellas. Con estos parámetros y aplicando la serie de Fourier, se generó una serie del nivel del mar que permitió predecir el comportamiento del nivel del mar en La Libertas desde julio 97 hasta marzo 98 con un 73% de correlación. El método fue óptimo para indicar con buena aproximación el comportamiento dinámico del evento cálido aún cuando los valores absolutos de nivel del mar tuvieron un margen mayor de error. Se evidenció la estrecha relación entre el comportamiento dinámico y térmico del océano durante el desarrollo de un evento El Niño. El análisis de los espectros evidenció el importante aporte de energía de las ondas interestacionales en el océano y sugiere que los eventos El Niño tienen patrones de interacción de las ondas océanicas que podrían ser de naturaleza recurrente y por lo tanto predecibles a partir de datos históricos disponibles.
    Description: Using times series of daily averages of sea level during years of occurrence of events El Niño in the station of La Libertad (02°15'S-81°27'W), techniques of spectral analysis were applied to determine the existence correlation between the last events and the first semester of 1997. Significant levels of coherence were obtained among the event El Niño 1982-1983 with the event of 1997. The comparative spectral analysis allowed to obtain the predominant waves, the amplitude and the angle of phase of each one of them. With this parameters and applying the Fourier series, a sea level serie was generated and allowed to predict the behavior of the sea level in La Libertad since july 1997 until march 1998 with a correlation of 73%. The method was acceptable to indicate with a close approach the dynamic behavior of the warm event when the absolute values of sea level had a bigger margin of error. The narrow relationship was evidenced among the dynamic and thermal behavior of the ocean during the development of an event El Niño. The analysis of the spectra evidenced the important contribution of energy of the intraseasonal waves in the ocean. It suggest that the events El Niño have interaction patterns of the oceanic waves that would be recurred and there fore predictable.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Prediction ; Spectral analysis ; Sea level ; Prediction ; El Nino phenomena ; Spectral analysis ; Fourier analysis ; Sea level ; Oceanographic data ; Time series
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: El presente trabajo permite conocer el comportamiento de la cuña salina en el sistema Río Guayas - Canal de Jambelí, conociendo que el Río Guayas abastece de agua a Guayaquil, puerto principal del país, y a muchas otras poblaciones.
    Description: The present work allows to establish the behavior of the salinity of the water, time of renovation and its effect on the quality of water in two established stages: increase in the level of the sea in 0.3 m. and 1.0 m. In the System of the Guayas Channel in Jambelí, considering the exchange of waters that exists between the Guayas River and the sea. The horizontal and vertical gradients of salinity are intimately bound with the flow of the Guayas River, as long as the flow increases the intrusion of the saline wedge will be minor. During the dry station the vertical gradients of salinity are maximums in the sector between The Esclusas - Point Stone. It is in this area where they give up the processes of mixture in a higher form. The gradient mentioned changes, being found in the south during the humid season. The gradients of salinity are important in the area already mentioned, after this, the variations don't present too many changes, this is a reason why it can be ignore. The advance of the saline wedge will be harmful, in the cases, where the water is used directly due to that an excess of salted water that will cause damages in the agriculture production of corn, rice, banana tree, etc. as well as the populations settled in the bordes of the Daule and Babahoyo rivers who use the water directly from the river for their daily work.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Water quality ; Irrigation water ; Rivers ; Sea level ; Water quality ; Sea level ; Climatic changes ; Salt-wedge estuaries ; Salt wedges ; Salinity gradients ; Irrigation water ; River water ; Rivers
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 5
    Publication Date: 2021-05-19
    Description: El objetivo del presente trabajo es estudiar la estructura termohalina superficial y subsuperficial de una región del Pacífico Sudeste (Guayaquil-Valparaíso), Fig. 1, durante el término de la primavera austral de 1997 para determinar los posibles cambios en la circulación. Para esta fecha se dio comienzo la VII Expedición Ecuatoriana a la Antártida a bordo del B/I ORION y simultáneamente se estaba desarrollando un evento ENOS de intensidad fuerte.
    Description: During the VII Ecuadorian Expedition to the Antarctic (December of 1997) the B/I ORION carried out oceanographic stations and XBT launches in the track (Guayaquil-Valparaiso in order to determine the change in circulation and termohaline structure on Southeast Pacific during the development of the ENSO event. By means of Sea Surface Temperature, sections of temperature and salinity diagrams T/S, were observed, positive surface and subsurface anomalies of subtropical surfaces waters that suggest a reforcement of the Equatorial undercurrent those feed the Gunther Undercurrent and the Perú-Chile Countercurrent those go toward the south, forcing to turn early toward the west to the Oceanic Current of Humboldt and to fathom the Chile Coastal Current Measures of direct current even the 100 meters demonstrate the great flow from north.
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Description: Pacifico sudeste
    Keywords: El Nino phenomena ; Thermohaline circulation ; Surface temperature ; T/S diagrams ; Current direction ; Countercurrents ; Current measurement ; Ocean circulation
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 6
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Publication Date: 2021-05-19
    Description: El objetivo de este artículo es documentar científicamente la evolución del evento "El Niño" en Ecuador, desde el punto de vista oceanográfico, sugiriendo posibles mecanismos involucrados en este proceso, vinculados a ondas interestacionales Kelvin en el océano (Kessler et al., 1995) que actúan como contraparte a las oscilaciones de 60 a 75 días en la atmósfera (Maden - Julian, 1995) y más específicamente de ondas encontradas en los espectros de nivel medio del mar y TSM en el mar ecuatoriano- colombiano con estas mismas características (Martínez, 1998).
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Air temperature ; Variability ; Isotherms ; Thermohaline circulation ; El Nino phenomena ; Surface temperature ; Cruises ; Kelvin waves ; Air temperature ; Mean sea level ; Salinity charts
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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