Abstract
DOI: 10.2514/1.24468An extensive investigation of the aberrating character of flow over a hemisphere-on-cylinder turret with a flatwindow was performed. Optical distortions over the window were measured using a two-dimensional wave frontsensor and a Malley probe. The Malley probe measurements were complemented with simultaneous hot-wiremeasurementsofthevelocityfieldnormaltothewindowatseveralpointsacrossitsdiameter.ThetestswererunforafixedelevationforseveralazimuthalanglesoverarangeofMachnumbers.Theresultsprovidethelevelsofunsteadyopticalaberration acrossthewindow,aswell asthelocalthickness,intensity,andconvectivespeedoftheseparatedflowoverthewindow.ResultsrevealthattheopticaldistortionsgrowapproximatelywiththesquareoftheincomingMach number multiplied by the freestream density, OPD
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