[PDF] Experimental Studies Of High Speed Separated Flows eBook

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Page : 0 pages
File Size : 48,2 MB
Release : 2002
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This final report describes the results of a four-year research effort that performed experimental studies in the general area of high. speed separated flows. The motivation for this research effort was to investigate in detail high-speed base flows that are similar in nature to those occurring for missiles and projectiles, so that they can be better understood, predicted, and controlled. The research program consisted of two inter-related tasks: (1) planar visualization and measurement of axisymmetric, supersonic base flows; and (2) three-dimensional, supersonic base flows. The research approach consisted of detailed separated flow experiments employing both conventional instrumentation, such as schlieren and shadowgraph photography, surface streakline visualization, and mean and fluctuating pressure measurements, with major emphasis on non-intrusive optical diagnostic techniques, including laser Doppler velocimetry, particle image velocimetry, planar Rayleigh/Mie scattering visualization, planar laser/induced fluorescence, and pressure. sensitive paint. We believe that this research effort has contributed significant fundamental understanding of the fluid dynamic mechanisms in separated flows, in addition to the direct relevance of this program to applications of importance to the U.S. Army.

Author : Dean R. Chapman
Publisher :
Page : 24 pages
File Size : 26,28 MB
Release : 1956
Category : Aerodynamics
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Some results are described of fundamental research conducted on various flow separation phenomena in two-dimensional streams. Experimental and theoretical results are described for the pressure rise across a reattachment region, and for the Reynolds number dependence of the pressure rise to a separation point. Observations are made throughout of the location of transition relative to reattachment and to separation, since this relative location turned out to be the dominant variable investigated.

Author : Holger Babinsky
Publisher : Cambridge University Press
Page : 481 pages
File Size : 22,47 MB
Release : 2011-09-12
Category : Technology & Engineering
ISBN : 1139498649

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Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.

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Page : 9 pages
File Size : 25,94 MB
Release : 2002
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The purpose of this instrumentation grant was to purchase equipment to be used in conjunction with an ongoing ARO-funded research grant entitled "Experimental Studies of High-Speed Separated Flows." The research efforts of this program are focused on experimental investigation of the fluid dynamic mechanisms and interactions within separated flow regions embedded in high-speed compressible flows. The fundamental objective is to improve understanding of the detailed flow processes in the near-wake of missile and projectile-type base flows with the long-term goal of optimizing and controlling these flows to derive flight vehicle performance benefits. The funds were used to repair the heads of two Nd:YAG lasers that are used heavily in particle image velocimetry, Rayleigh/Mie scattering, and planar laser-induced fluorescence (PLIF) experiments. These replacements/repairs will extend the lives of these lasers for at least 5 years. The department also used the equipment funds to purchase an intensified CCD array camera system that may be used for experiments with low signal levels (e.g., for ongoing acetone PLIF experiments). Finally, funds were used to purchase a state-of-the-art pressure transducer calibration dead-weight tester. In all cases, purchase of this equipment will help to maintain and strengthen the department's ability to make significant contributions to the research area of compressible, separated flows, which is of significant importance to the U.S. Army. The specific pieces of equipment, vendors, and purchase prices are detailed.