TY - GEN
T1 - Validation study of pressure-measurement system with laser displacement sensor and film
AU - Tezuka, Asei
PY - 2008/12/1
Y1 - 2008/12/1
N2 - For a conventional surface pressure measurement in a wind tunnel, the following techniques are used: the differential pressure transducer method and the pressure-sensitive paint method. The former affords high-precision results, but is expensive due to the fabrication cost. The latter has a reduced cost; however, the change in the oxygen partial pressure decreases at low speeds. In this paper, a new, low-cost method is proposed to measure the surface pressure under low-speed conditions. In this method, the surface of a model is drilled and a film is attached to the cavity. The film is deflected by the differential pressure between the inner cavity and the outer surface. This differential pressure is calculated by the deflection of the film, which, in turn, is measured by a laser displacement sensor. The measurement accuracy of the sensor depends on the reference length, which is the distance from the sensor head to the target. Three types of laser displacement sensors with reference lengths of 30 mm, 150 mm, and 400 mm were used. The results indicate that the differential pressure can be measured by two laser displacement sensors whose reference lengths are 30 mm and 150 mm. The surface reflection rate of the film and the traverse speed of the measurement were changed to determine their influence on the pressure measurement results.
AB - For a conventional surface pressure measurement in a wind tunnel, the following techniques are used: the differential pressure transducer method and the pressure-sensitive paint method. The former affords high-precision results, but is expensive due to the fabrication cost. The latter has a reduced cost; however, the change in the oxygen partial pressure decreases at low speeds. In this paper, a new, low-cost method is proposed to measure the surface pressure under low-speed conditions. In this method, the surface of a model is drilled and a film is attached to the cavity. The film is deflected by the differential pressure between the inner cavity and the outer surface. This differential pressure is calculated by the deflection of the film, which, in turn, is measured by a laser displacement sensor. The measurement accuracy of the sensor depends on the reference length, which is the distance from the sensor head to the target. Three types of laser displacement sensors with reference lengths of 30 mm, 150 mm, and 400 mm were used. The results indicate that the differential pressure can be measured by two laser displacement sensors whose reference lengths are 30 mm and 150 mm. The surface reflection rate of the film and the traverse speed of the measurement were changed to determine their influence on the pressure measurement results.
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M3 - Conference contribution
AN - SCOPUS:78149441342
SN - 9781563479373
T3 - 46th AIAA Aerospace Sciences Meeting and Exhibit
BT - 46th AIAA Aerospace Sciences Meeting and Exhibit
T2 - 46th AIAA Aerospace Sciences Meeting and Exhibit
Y2 - 7 January 2008 through 10 January 2008
ER -