Development of subminiature multi-sensor hot-wire probes
Westphal, Russell V.
Ligrani, Phillip M.
Lemos, Fred R.
MetadataShow full item record
Limitations on the spatial resolution of multisensor hot wire probes have precluded accurate measurements of Reynolds stresses very near solid surfaces in wind tunnels and in many practical aerodynamic flows. The fabrication, calibration and qualification testing of very small single horizontal and X-array hot-wire probes which are intended to be used near solid boundaries in turbulent flows where length scales are particularly small, is described. Details of the sensor fabrication procedure are reported, along with information needed to successfully operate the probes. As compared with conventional probes, manufacture of the subminiature probes is more complex, requiring special equipment and careful handling. The subminiature probes tested were more fragile and shorter lived than conventional probes; they obeyed the same calibration laws but with slightly larger experimental uncertainty. In spite of these disadvantages, measurements of mean statistical quantities and spectra demonstrate the ability of the subminiature sensors to provide the measurements in the near wall region of turbulent boundary layers that are more accurate than conventional sized probes.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Spatial resolution and measurement of turbulence in the viscous sublayer using subminiature hot-wire probes Ligrani, P.M.; Bradshaw, P. (Springer-Verlag, 1987);Measurements in the viscous sublayer of a flat-plate turbulent boundary layer in air, using single hot-wire sensors with lengths from 1-60 viscous length scales show that, at a given distance from the surface, the turbulence ...
The 2-D (Stereo) Probe: Design and preliminary tests of a new airborne, high-speed, high-resolution, particle imaging probe Lawson, R. Paul; O’Connor, Darren; Zmarzly, Patrick; Weaver, Kim; Baker, Brad; Mo, Qixu; Jonsson, Haflidi (2006);The design, laboratory calibrations, and flight tests of a new optical imaging instrument, the twodimensional stereo (2D-S) probe, are presented. Two orthogonal laser beams cross in the middle of the sample volume. Custom, ...
Baun, Lawrence Richard (1988-09);The development and structure of Dean vortices in a curved channel were measured and studied. A 40:1 aspect ratio channel with mild curvature was employed. Circulation of mean streamwise vorticity, and maxima of ...