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Roughness Induced Transition In A Hypersonic Capsule Boundary Layer Under Wind Tunnel And Reentry Conditions
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Book Synopsis Roughness-induced Transition in a Hypersonic Capsule Boundary Layer Under Wind-tunnel and Reentry Conditions by : Antonio di Giovanni
Download or read book Roughness-induced Transition in a Hypersonic Capsule Boundary Layer Under Wind-tunnel and Reentry Conditions written by Antonio di Giovanni and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Correlation of Artifically Induced Boundary-layer Transition Data from Blunt Slender Cones at Hypersonic Speeds by : Albert H. Boudreau
Download or read book A Correlation of Artifically Induced Boundary-layer Transition Data from Blunt Slender Cones at Hypersonic Speeds written by Albert H. Boudreau and published by . This book was released on 1979 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comments on Hypersonic Boundary-layer Transition by : Kenneth F. Stetson
Download or read book Comments on Hypersonic Boundary-layer Transition written by Kenneth F. Stetson and published by . This book was released on 1990 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a survey paper on the subject of hypersonic boundary-layer transition. Part 1 discusses boundary-layer stability theory, hypersonic boundary-layer stability experiments, and a comparison between theory and experiment. Part 2 contains comments on how many configuration and flow parameters influence transition. Part 3 discusses some additional general aspects of transition. Part 4 discusses problems of predicting transition and comments on three prediction methods. Part 5 contains some general guidelines for prediction methodology. Keywords: Boundary layer transition, Boundary layer stability, Hypersonic boundary layers.
Book Synopsis Transition Fixing for Hypersonic Flow by :
Download or read book Transition Fixing for Hypersonic Flow written by and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boundary-layer Transition Under Hypersonic Conditions by : J. Leith Potter
Download or read book Boundary-layer Transition Under Hypersonic Conditions written by J. Leith Potter and published by . This book was released on 1965 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Studies on Boundary-layer Transition on a Reentry Vehicle of Transonic and Supersonic Speeds by : Kojiro Suzuki
Download or read book Experimental Studies on Boundary-layer Transition on a Reentry Vehicle of Transonic and Supersonic Speeds written by Kojiro Suzuki and published by . This book was released on 1995 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The boundary-layer transition on the EXPRESS reentry capsule at transonic and supersonic speeds is studied experimentally by the wind tunnel tests. For the diagnostic of the turbulent transition of the boundary-layer, the China-clay method is used. The experimental results clarify that when the freestream Mach number increases, the transition point moves downstream on the body surface and the distance between the beginning of the transition and its completion to the fully turbulent flow becomes larger. The effects of the freestream Mach number on the location of the boundary-layer transition are described successfully in terms of two non-dimensional quantities, that is, the transition Reynolds number and the local Mach number at the boundary-layer edge. The oil-flow pictures reveal that in the transonic regime, the separation bubble is formed at the junction between the blunt nose and the conical part of the body and therefore the transition begins behind the reattachment point of the separation bubble. The effects of the turbulent transition on the aerodynamic characteristics of the reentry body are investigated by using the technique of the boundary-layer trip and the experimental results show that the aerodynamic characteristics of the EXPRESS reentry vehicle are not sensitive to the boundary-layer transition.
Book Synopsis Application of non-intrusive experimental techniques to roughness-induced transition in hypersonic flows by : Francesco Avallone
Download or read book Application of non-intrusive experimental techniques to roughness-induced transition in hypersonic flows written by Francesco Avallone and published by Youcanprint. This book was released on 2015-04-30 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of non-intrusive experimental techniques is a break-through in the comprehension of the physical mechanisms governing roughness-induced transition in hypersonic flows. In this thesis, IR Thermography, Planar and Tomographic Particle Image Velocimetry are applied. They show a great potentiality in quantifying the most relevant flow features upstream and downstream of three-dimensional roughness elements. Particularly, non-intrusive measurements of the two-dimensional and three-dimensional velocity flow fields are reported and discussed.
Book Synopsis A Study of Boundary Layer Transition on Outgassing Cones in Hypersonic Flow by :
Download or read book A Study of Boundary Layer Transition on Outgassing Cones in Hypersonic Flow written by and published by . This book was released on 1971 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Results in Numerical and Experimental Fluid Mechanics XI by : Andreas Dillmann
Download or read book New Results in Numerical and Experimental Fluid Mechanics XI written by Andreas Dillmann and published by Springer. This book was released on 2017-10-29 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers contributions to the 20th biannual symposium of the German Aerospace Aerodynamics Association (STAB) and the German Society for Aeronautics and Astronautics (DGLR). The individual chapters reflect ongoing research conducted by the STAB members in the field of numerical and experimental fluid mechanics and aerodynamics, mainly for (but not limited to) aerospace applications, and cover both nationally and EC-funded projects. Special emphasis is given to collaborative research projects conducted by German scientists and engineers from universities, research-establishments and industries. By addressing a number of cutting-edge applications, together with the relevant physical and mathematics fundamentals, the book provides readers with a comprehensive overview of the current research work in the field. Though the book’s primary emphasis is on the aerospace context, it also addresses further important applications, e.g. in ground transportation and energy.
Book Synopsis Experimental Investigations of Hypersonic Boundary Layer Transition on a Re-entry Capsule by : Syed Raza Christopher Ali
Download or read book Experimental Investigations of Hypersonic Boundary Layer Transition on a Re-entry Capsule written by Syed Raza Christopher Ali and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis EFFECTS OF COOLING ON TRANSITION IN USE BOUNDARY LAYER ON A HEMISPHERE IN SIMULATED HYPERSONIC FLOW by : ROGER DUNLAP
Download or read book EFFECTS OF COOLING ON TRANSITION IN USE BOUNDARY LAYER ON A HEMISPHERE IN SIMULATED HYPERSONIC FLOW written by ROGER DUNLAP and published by . This book was released on 1961 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of a Transitional Hypersonic Boundary Layer by : Sandy Tirtey
Download or read book Characterization of a Transitional Hypersonic Boundary Layer written by Sandy Tirtey and published by LAP Lambert Academic Publishing. This book was released on 2010-10 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roughness induced boundary layer transition has been one of the main research topics for the hypersonic community over the last half- century. The major interest into the understanding of this phenomenon relies in the key role played by transition prediction methods on hypersonic vehicles thermal protection system (TPS) design. Several boundary layer transition predictions methods have been developed but a review of these transition criteria reveals a lack a physics associated with these engineering methods together with a lack of reliable flight data. The work presented in this thesis is a first step trying to fill this gap. First, the physical mechanisms associated with hypersonic roughness induced transition are investigated both experimentally and numerically. Secondly, an hypersonic roughness induced transition experiment has been developed for the EXPERT mission, aiming to obtain high quality flight data.
Book Synopsis Boundary Layer Transition and Surface Roughness Effects in Hypersonic Flow by :
Download or read book Boundary Layer Transition and Surface Roughness Effects in Hypersonic Flow written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies are being conducted to examine the stagnation region heating in transitional flow over blunt nose tips; and the effects of surface roughness on the heat transfer and skin friction to hypersonic re-entry vehicles. Measurements have been made of the distribution of heat transfer and skin friction over sharp and blunted cones to a range of incidences for surface roughness of 0, 10 and 15 mils. These studies have been conducted at a local Mach number of 11.7 and Reynolds numbers based on model length of 30 x million, giving roughness Reynolds numbers from transitional to fully rough over the models. New calorimeter and thin film instrumentation was developed expressly for the rough wall heating measurements. The measurements indicated that while the roughness-induced augmentations in heat transfer and skin friction were less than would be predicted using theories based on low speed data for low R sub k's, close to the nose tip significantly larger augmentation factors were observed. The current studies suggest that significant compressibility effects may be present in hypersonic turbulent boundary layers over rough walls. The models and highly detailed heat transfer and pressure instrumentation have been completed for the stagnation point heating studies. A new and novel throat valve has been developed to eliminate the frangible mylar diaphragm which can cause particles and disturbances during flow establishment in the shock tunnel. The experimental studies are now in progress.
Book Synopsis Experimental Investigation of Induced Supersonic Boundary Layer Transition by : Henny Bottini
Download or read book Experimental Investigation of Induced Supersonic Boundary Layer Transition written by Henny Bottini and published by . This book was released on 2014 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence onset within an initially laminar flow is one of the most common phenomenon in Fluid Mechanics, yet is an open field of research. This is due to the many and diverse causes that can trigger turbulence, which often add to each other, change their effect upon the flow velocity, and are difficult to single out in real-world situations. This is why laminar-toturbulent transition experiments have been and still are a fundamental tool for the researcher. This thesis work has addressed the study of turbulence onset in supersonic flows from an experimental point of view. Two test campaigns have been carried out each in a dedicated supersonic wind tunnel. The first aimed at tracking turbulence onset triggered by a single tetrahedral roughness element. It has been carried out in a multiple-Mach-number supersonic wind tunnel whose qualification campaign has been completed within this thesis work. Two roughness heights were tested, both for two Mach numbers, 1.6 and 2.3. The second test campaign has investigated the effects of an oblique shock wave impinging onto a Mach-2 transitional boundary layer. The transitional state of a boundary layer is that state during which the boundary layer passes from fully laminar to fully turbulent. This passage can be either induced or natural, and it was represented in this thesis work by the trigger wake and by the boundary layer flow downstream of the release point of an electric spark, respectively. Surface sensors, as thin-films and piezoelectric pressure transducers, were used to measure steady and unsteady highfrequency flow evolutions. Different wall temperatures were set for the thin-films insert as to allow the experimental estimation of the recovery temperature. Convective heat-flux trends have been extracted from the steady measurements, which, together with the recovery temperature trends, allowed the calculation of the Stanton number trends. All these quantities let to conclude on the general state of the boundary layer investigated in the first test campaign. The post-processing of the unsteady measurements yielded temperature and pressure fluctuations spectra and RMS streamwise evolutions, along with spectral time evolution at a given position. For the first test campaign, they allowed the characterization of the unsteadiness produced by the roughness within the supersonic boundary layer at different downstream locations. In so doing, they helped conclude on the state of the boundary layer, thus on the effectiveness of the roughness in triggering transition to turbulence. For the second test campaign, they allowed to single out the unsteady effects of the shock impinging downstream of the single roughness and downstream of the electric spark release point. In this way, differences in the shock effect between the roughness configuration and the clean-plate configuration have been highlighted, and the effects of different spark release frequencies compared.
Book Synopsis Hypersonic Boundary Layer Transition Experiments by : Kenneth F. Stetson
Download or read book Hypersonic Boundary Layer Transition Experiments written by Kenneth F. Stetson and published by . This book was released on 1980 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Documentation of Two- and Three-dimensional Hypersonic Shock Wave/turbulent Boundary Layer Interaction Flows by : Marvin I. Kussoy
Download or read book Documentation of Two- and Three-dimensional Hypersonic Shock Wave/turbulent Boundary Layer Interaction Flows written by Marvin I. Kussoy and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Studies of Hypersonic Boundary-layer Transition and Effects of Wind-tunnel Disturbances by :
Download or read book Experimental Studies of Hypersonic Boundary-layer Transition and Effects of Wind-tunnel Disturbances written by and published by . This book was released on 1974 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
