Doppler global velocimetry - Fundamentals, implementation and selected applications
Willert, Christian (2005) Doppler global velocimetry - Fundamentals, implementation and selected applications. In: Advanced Measuring Techniques for Supersonic Flows VKI-Lecture Series Monographs, 2005 (1). Von Karman Institute for Fluid Mechanics (Rhode St.Genèse, Belgium). . ISBN 2-930389-57-5.
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Doppler global velocimetry (DGV) – also known as planar Doppler velocimetry (PDV) – is a relatively new technique capable of obtaining planar velocity maps of flow fields. Although its original proposal dates back to a patent by Komine of Northrop Corporation in 1990, it has found use in a rather limited range of applications with only a limited number of research institutes world-wide actively developing or frequently using the technique. Dr. J. Meyers of NASA Langley not only gave the new technique the name ‘DGV’ but more importantly was among the first to turn the rather simple concept behind DGV into a functional tool for use in applied aerodynamics. There are several reasons for the rather limited use of DGV more than one decade since introduction. One of the foremost factors has been the rapid development of the particle image velocimetry technique (PIV) which has taken benefit from significant advances in laser and camera technology as well as from increased computing power. To date PIV has made planar flow mapping possible in nearly in any application involving fluid mechanics. Another hurdle faced by DGV is that it requires a considerable amount of background knowledge and specialized hardware to arrive at a functional DGV system. Contrary to PIV, which measures the displacement of particle images, DGV relies on a quantitative measurement of light intensity which effectively makes it an analogue technique (similar to measuring a voltage or temperature). Background scene illumination is just one of many factors which can severely impair a DGV measurement while a PIV system under the same conditions would operate without any significant loss of signal. In spite of these and other disadvantages DGV holds promises in areas that are beyond the reach of PIV. The article first gives an overview of the main principles on which DGV is founded, followed by some exemplary applications of the DGV technique.
|Document Type:||Book Section|
|Title:||Doppler global velocimetry - Fundamentals, implementation and selected applications|
|Journal or Publication Title:||Advanced Measuring Techniques for Supersonic Flows|
|In ISI Web of Science:||No|
|Publisher:||Von Karman Institute for Fluid Mechanics (Rhode St.Genèse, Belgium)|
|Series Name:||VKI-Lecture Series Monographs|
|Keywords:||Doppler velocimetry, measurement techniques, optical techniques, particle image velocimetry, DGV, PIV|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L ER - Engine Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Virtual Engine and Validation Methods|
|Institutes and Institutions:||Institute of Propulsion Technology > Engine Measurement Systems|
|Deposited By:||Dr.phil. Christian Willert|
|Deposited On:||06 Feb 2006|
|Last Modified:||27 Apr 2009 04:57|
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