Topic
Wind shear
About: Wind shear is a research topic. Over the lifetime, 8023 publications have been published within this topic receiving 185373 citations.
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TL;DR: In this article, a portable open-floored wind tunnel was used to develop threshold wind speeds over two pebble covered desert soils and a sandy agricultural soil, and the results showed that the wind tunnel can be used to simulate wind speeds of up to 50 km/hr.
63 citations
TL;DR: In this paper, the static stability of the Jupiter troposphere at pressure levels of 0.5-22 bars was derived from T-sensor measurements alone using the linear gravity wave theory.
63 citations
01 Jul 2006
TL;DR: In this paper, a method, called WiRAR, is developed to measure the wind vector using a marine X-band radar as sensor, which extracts local wind directions from wind induced streaks, which are visible in radar images at scales above 50 m.
Abstract: A method, called WiRAR, is developed to measure the wind vector using a marine X-band radar as sensor. WiRAR extracts local wind directions from wind induced streaks, which are visible in radar images at scales above 50 m. It is shown that the streaks are very well aligned with the mean surface wind directions. Wind speeds are derived with WiRAR from the normalized radar cross section (NRCS), by parametrization of its dependency on the wind vector, which was performed by training of a Neural Network. The dependency of the NRCS on sea state and atmospheric parameters, such as air-sea temperatures and humidity, were studied with respect to further improvement of WiRAR. Therefore, sea state parameters are extracted from radar-image sequences by derivation of the Signal-to-Noise Ratio (SNR) and wave phase speed at the spectral peak cp. The SNR is directly related to the significant wave height Hs- Recently, the research platform FINO-I has been set-up in the German Bight. This platform provides various environmental data, such as wind measurements at different heights of up to 100 m for studying the atmospheric boundary layer, as well as air-sea temperatures, humidity, and other meteorological and oceanographical parameters. WiRAR is applied to radar-image sequences acquired by a marine X-band radar aboard FINO-I. The derived wind vectors are compared to wind measurements at the platform. The comparison of wind directions resulted in a correlation coefficient of 0.99 with a standard deviation of 12.8deg and for wind speeds with a correlation coefficient of 0.99 with a standard deviation of 0.41 ms-1, respectively. In contrast to traditional offshore wind sensors, the retrieval of the wind vector from the backscatter of the ocean surface makes the system independent of the sensors motion and installation height and reduces the effects due to platform induced blockage and turbulence effects.
63 citations
TL;DR: In this article, the effect of turbulence intensity and wind shear on the power characteristics of a two-bladed HAWT was analyzed by using a wind tunnel experiments, and the results showed that the power coefficient was strongly dependent on the blade pitch angle and yaw angle.
63 citations
TL;DR: In this article, the authors investigated the performance of a small vertical-axis wind turbine at an environment with the turbulence intensity more than 30%, particularly on the influence of the vertical wind, the vertical angle, the wind with the unknown direction, the horizontal wind speed, and turbulence intensity on the power output, which are seldom reported before.
63 citations