Simulation of Turbulent Slot Injection of Different Gases Into a Supersonic Air Stream PDF Download
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Author: P. Gerlinger
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Category :
Languages : en
Pages :
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Author: P. Gerlinger
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Category :
Languages : en
Pages :
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Author: Donald P. Rizzetta
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages : 111
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The results of an experimental and analytical study of tangential slot injection into a supersonic stream are presented. The experiments were performed in an atmospheric intake wind tunnel with freestream Mach numbers of 2.85 and 4.19. Injection of air, helium and carbon dioxide at various subsonic Mach numbers and one supersonic condition was considered. Experiments for the flow over of wedges with turning angles between 5 and 25 deg. located on the wall downstream of the injection are also reported. The principal data are in the form of spark schlieren photographs, interferograms and wall static pressure distributions. Density profiles at several axial stations determined from interferograms are also presented. The transition to turbulence in the shear layer and the character of the turbulence were observed from the spark schlieren photographs. The presence of separation zones was detected by small tufts or threads on the surface. With subsonic injection, it is found that the initial slot exit conditions are not arbitrary for a given injectant mass flow but are determined by the downstream interaction between the two streams. The flow field has many of the features of the now well-known base-flow problem. A relatively simple analysis is developed which predicts the initial jet exit conditions. Very good agreement with the experimental observations is achieved.
Author: Michael Kenworthy
Publisher:
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Category : Aerodynamics, Supersonic
Languages : en
Pages : 52
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An experimental investigation of two-dimensional tangential-slot injection into a turbulent boundary layer at a freestream Mach number of 2.4 has been conducted. Nearly adiabatic surface temperatures were maintained during all tests. Static and pitot pressure profiles at four stations downstream of the slot were obtained. Skin friction was measured at the last three stations with a self-nulling balance. Schlieren photographs of the flow field were also obtained. Most of the data were obtained with slot Mach numbers of 0.31 and 0.66 corresponding to slot pressure less than and equal to stream static pressure, respectively. For the latter matched-pressure case, tangential slot injection reduced the surface shear at the three measuring stations by about 60 to 20 percent for increasing downstream distances from the slot of 12 to 28 slot heights. However, for the other case where slot pressure was less than stream static pressure, the effect of injection was to increase the shear by about 90 percent at the last downstream station of 28 slot heights. This increase in shear is attributed to the rapid acceleration of the low speed injectant stream by the high speed main stream and the increasing pressure through the recompression zone which is absent for the matched pressure case.
Author: Fei Thomas Kwok
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 398
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Category : Heat
Languages : en
Pages : 642
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Author: Steven Jones
Publisher: BoD – Books on Demand
ISBN: 9535102419
Category : Science
Languages : en
Pages : 246
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Whereas the field of Fluid Mechanics can be described as complicated, mathematically challenging, and esoteric, it is also imminently practical. It is central to a wide variety of issues that are important not only technologically, but also sociologically. This book highlights a cross-section of methods in Fluid Mechanics, each of which illustrates novel ideas of the researchers and relates to one or more issues of high interest during the early 21st century. The challenges include multiphase flows, compressibility, nonlinear dynamics, flow instability, changing solid-fluid boundaries, and fluids with solid-like properties. The applications relate problems such as weather and climate prediction, air quality, fuel efficiency, wind or wave energy harvesting, landslides, erosion, noise abatement, and health care.
Author:
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Category : Aeronautics
Languages : en
Pages : 710
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Category : Aeronautics
Languages : en
Pages : 836
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Author:
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Category : Aeronautics
Languages : en
Pages : 580
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A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
