A New Multipoint Thin-Film Diagnostic Technique for Fluid Dynamic Studies NASA Langley Research Center Hampton, Va

Format:

Conference/Event

Author/Creator:

Sewall, W. G., author.

Conference Name:

Aerospace Technology Conference & Exposition (1988-10-03 : Anaheim, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1988

Summary:

A multielment hoc-film sensor has been developed with closely-spaced elements (2.5mm) in the streamwise direction. Constant temperature anemometers are arranged to monitor only the time varying component of the hot-film element output voltage. In addition to boundary-layer transition detection, the output of these multielement sensors can reveal the locations of boundary-layer separation and reattachment by a 180° phase difference in the 0-200 Hz frequency bandwidth between sensor elements on each side of either the separation or reattachment point. This phase difference phenomenon requires no apriori calibration of the hot-film elements and has been demonstrated on both laminar and turbulent boundary layers. The present paper describes the features of multielement hot-film sensor arrays and discusses results from their application to a number of low-speed and transonic airfoil tests

Notes:

Vendor supplied data

Publisher Number:

881453

Access Restriction:

Restricted for use by site license