21st Aerospace Sciences Meeting 1983
DOI: 10.2514/6.1983-293
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Alteration of outer flow structures for turbulent drag reduction

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Cited by 33 publications
(13 citation statements)
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“…In the tandem configuration, the distance between the tandem blades was 254 mm corresponding to 10 half channel heights. These configurations correspond to the optimal as reported in boundary layer studies by various investigators (see Mumford and Savill (1988), Plesniak and Nagib (1985), Hefner et al (1983), Bertelrud et al (1982) and Anders and Watson (1985)). …”
Section: Manipulatorsmentioning
confidence: 99%
“…In the tandem configuration, the distance between the tandem blades was 254 mm corresponding to 10 half channel heights. These configurations correspond to the optimal as reported in boundary layer studies by various investigators (see Mumford and Savill (1988), Plesniak and Nagib (1985), Hefner et al (1983), Bertelrud et al (1982) and Anders and Watson (1985)). …”
Section: Manipulatorsmentioning
confidence: 99%
“…Langley's efforts to reproduce the IIT results were reported by Heftier et al 12 Although care was used in the LaRC study to duplicate what were thought to be the important parameters, the largest net reductions were only 6% as compared with the 20% net reductions of Corke. This inability to repeat experimental results from laboratory to laboratory proved to be characteristic of many of the early studies and is indicative of the number of parameters involved as well as the sensitivity of the process to device geometry, flow conditions, and measurement technique.…”
Section: Initial Iit and Larc Studiesmentioning
confidence: 99%
“…The initial successful experiments of Corke 10 and Heftier et al 12 were conducted using the momentum balance method of determining local skin friction and overall net drag. The steady, two-dimensional, incompressible momentum integral equation for a turbulent boundary layer is given by…”
Section: F Measurement Techniquesmentioning
confidence: 99%
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“…The possibility of the largeeddy breakup (LEBU) method was examined by Yajnik and Acharya 1 and, subsequently, by Corke et al, 2 Hefner et al, 3 and Bertelrud et al 4 The principal purpose of these works focused on optimizing the configuration of a manipulator to accomplish more effective drag reduction. 5 These works are of practical importance, but they have not given much information on the fluid-dynamics mechanisms whereby large-scale coherent motions are controlled by the manipulator. Though a number of measurements have been carried out using conditional sampling methods, 6 we still have only unfixed configurations of the nonmanipulated coherent motions because of their random occurrence in time and location in a turbulent boundary layer.…”
Section: Introductionmentioning
confidence: 99%