Boundary-layer instability and transition on a flared cone in a Mach 6 quiet wind tunnel
by Jerrod Hofferth; William Saric; Joseph Kuehl; Eduardo Perez; Travis Kocian; Helen Reed
International Journal of Engineering Systems Modelling and Simulation (IJESMS), Vol. 5, No. 1/2/3, 2013

Abstract: Measurements of boundary-layer transition location and boundary layer profiles on a sharp-tipped 5°-half-angle flared cone were made in a low-disturbance Mach 6 wind tunnel. Uncalibrated boundary-layer profiles of mean and fluctuating voltage representative of mass flux are obtained using constant temperature hot-wire anemometry at several axial locations, and are notionally compared with preliminary simulations. Spectral energy content is observed between 250 and 310 kHz - the first measurements of frequencies typical of the second mode instability at Texas A&M. Growth of this high-frequency content is compared with N-factor results from linear parabolised stability equation (LPSE) computations. Possible sources of disagreement between the experimental and computed frequencies for second-mode growth are discussed, as are future improvements to the hotwire anemometry technique. Nevertheless, the successful measurement of high-frequency content highlighted here constitutes an important step toward acquisition of calibrated measurements of hypersonic boundary-layer instabilities to be used as code validation.

Online publication date: Fri, 29-Aug-2014

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