The r esults detected for three dimensional 60°delta wing model showed that the surf ace hot film technique can give quantitative information of the surface boundary la yer transition positions, both the infrared image and the liquid crystal techniq ues as using were affected by environmental conditions.
This paper presents the calibration results and the comparison of various measuring techniques for wall shearing stress measurement both in compressible and incompressible, turbulent boundary layers, including Preston tube, Stanton tube, sublayer fence, surface hot-film and computational Preston tube method.
This paper gives a description of the application of surface hot film to the measurement of skin shear atresses. The distribution of skin shear stresses on a circular cylinder is investigated by means of model B-1 hot film probes designed by ourselves.
Wall static pressures, mean velocities, Reynolds stresses and wall shear distribution around the pipe are measured using pressure transducers, rotating-wires and surface hot-film gauges.
This paper gives a description of the application of surface hot film to the measurement of skin shear atresses.The distribution of skin shear stresses on a circular cylinder is investigated by means of model B-1 hot film probes designed by ourselves.
In order to locate the boundary layer transition experimentally, the selfmade surface hot film gages M-1 were flush stuck on the upper surface of the NACA 0012 airfoil at distances from the leading edge x/b = 0. 4, 0. 5, 0.6, 0.7, 0.8. The experiments were carried out in a low speed wind tunnel. Measuring instrumentation comprised a tsi 1050 hot wire anemometer, tsi 1070 RMS voltmeter and a MS-5511 memory oscilloscope and gave electric voltage E, fluctuating voltage RMS Erms and the oscillograms of the volt...
In the study of boundary layer, by means of surface hot film, a new way is provided to measure the magnitute and direction of wall shear stress. This paper is written on the basis of investigation and testing of surface hot film. Some basic methods of experiment and limits of applica-tion are introduced with our typical experimental results.