The dynamic characteristics of the K-Gill anemometer were evaluated by comparing the anemometer with a hot wire system in a field test, after the static characteristics of the anemometer had been evaluated in a wind tunnel test. The wind tunnel test showed a non-linear and a non-cosine behavior, as shown in previous studies (Ataktürk, 1988; Pond et al., 1979). The turbulence energy spectra from the field test revealed that the propeller anemometer behaves like a single-pole low-pass RC filter, as suggested in previous studies (Ataktürk, 1988; Pond et al., 1979; MacCready and Jex, 1964). The test results showed that mean wind velocity components can be measured with an error of 2%. To determine the Reynolds stress values, uw covariance and friction velocity from different methods were compared. When the stability conditions were unknown, the resulting Reynolds stress estimations have 15% relative differences between different methods. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/41396 |
| Date | 04 March 2009 |
| Creators | Wei, Chunghwa |
| Contributors | Aerospace Engineering |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | xiii, 132 leaves, BTD, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 22293903, LD5655.V855_1990.W45.pdf |
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