A commercially available Laser Doppler and a Laser Transit Anemometer were used in a comparative way to measure the flow field of a .732 m diameter 6-bladed propeller. The test were performed in the NLR Low Speed Wind Tunnel which has a 3.0 x 2.25 m2 test section. Free stream velocity was 40 m/s and the propeller rotational speed was selected to be either 3500 or 6000 r.p.m.. Both Laser Anemometers were two-component systems and during the flow field surveys in front of, in between and behind the propeller blades the axial and tangential velocity components were measured. The results of the two systems were found to be within 1.4 m/s of each other. The LDA angular resolution proved to be better and showed significant flow details which were missed by the LTA. The LTA underlined its well known advantage of high light concentration in the spots. Both systems performed flawless and proved their capability to work in an industrial environment. The LDA had about a 3 times larger productivity than the LTA system.
Selection of a laser anemometer technique for propeller tests in wind tunnels
Wahl einer Laser-Anemometertechnik fuer die Pruefung von Propellern im Windkanal
AIAA-Papers ; Jul ; 1-10
1988
10 Seiten, 11 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
Experimental methods in wind tunnels and water tunnels, with special emphasis on hot-wire anemometer
Engineering Index Backfile | 1967
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