Author: J. P. BonnetPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Experimental Studies of the Turbulent Structure of Supersonic Mixing Layers
Author: J. P. BonnetAn Experimental Investigation of a Two-Dimensional, Self-Similar, Supersonic Turbulent Mixing Layer with Zero Pressure Gradient
Author: Hideo IkawaPublisher:
ISBN:
Category :
Languages : en
Pages : 39
Book Description
The effect of compressibility on the mixing layer was investigated at Mach number 2.47. Pitot pressure, static pressure and hot-wire surveys were made to investigate the mean flow and the fluctuation quantities. Similarities between supersonic and incompressible mixing layers are observed in normalized velocity profile, normalized power spectral density distribution and convection velocity distribution. Spreading rate, normalized shear stress and velocity fluctuation were found to be appreciably smaller than the respective incompressible results; e.g., the momentum thickness growth rates are 0.0073 and 0.035 for supersonic and incompressible flows, respectively. The difference between free and wall-bounded mixing layers is discussed. Development of turbulence structure of mixing layer with increasing Reynolds number was also investigated. (Author).
Turbulent Shear Layers in Supersonic Flow
Author: Alexander J. SmitsPublisher: Springer Science & Business Media
ISBN: 0387263055
Category : Science
Languages : en
Pages : 418
Book Description
A good understanding of turbulent compressible flows is essential to the design and operation of high-speed vehicles. Such flows occur, for example, in the external flow over the surfaces of supersonic aircraft, and in the internal flow through the engines. Our ability to predict the aerodynamic lift, drag, propulsion and maneuverability of high-speed vehicles is crucially dependent on our knowledge of turbulent shear layers, and our understanding of their behavior in the presence of shock waves and regions of changing pressure. Turbulent Shear Layers in Supersonic Flow provides a comprehensive introduction to the field, and helps provide a basis for future work in this area. Wherever possible we use the available experimental work, and the results from numerical simulations to illustrate and develop a physical understanding of turbulent compressible flows.
Supersonic Mixing of Jets and Turbulent Boundary Layers
Author: Harry Edward BaileyPublisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 54
Book Description
High Resolution Measurements of Supersonic Mixing and Combustion in Coflowing Turbulent Jets
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 59
Book Description
An experimental study of compressibility effects on the large scale structure and outer variable scaling laws of a coflowing turbulent jet was partially completed. Results showed distinct large scale structure and classical incompressible scaling where the convective Mach number has decreased to subsonic values. At supersonic convective Mach numbers no large scale structure was seen and incompressible scalings were dramatically modified. Experiments also showed strong effects due to oblique shock wave interactions with combustion in supersonic turbulent jets. OH PLIF imaging measurements comparing subsonic and supersonic jets documented striking differences in their mixing and combustion properties. Combined OH/CH PLIF imaging measurements found large differences in the combustion properties of jet flames created by small differences in the fuel injection design. A theoretical study of density effects due to combustion heat release on the outer variable scalings of turbulent shear flows was completed. This study produced a general methodology for predicting the changes in such quantities as growth rates, velocity decay, and entrainment and mixing rates due to heat release. Comparisons with measured heat release effects in the literature, including planar and axisymmetric jet flames as well as mixing layers, showed excellent agreement with this general approach.
Effect of Swirl on Turbulent Structures in Supersonic Jets
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722192457
Category :
Languages : en
Pages : 36
Book Description
Direct Numerical Simulation (DNS) is used to study the mechanism of generation and evolution of turbulence structures in a temporally evolving supersonic swirling round jet and also to examine the resulting acoustic radiations. Fourier spectral expansions are used in the streamwise and azimuthal directions and a 1-D b-spline Galerkin representation is used in the radial direction. Spectral-like accuracy is achieved using this numerical scheme. Direct numerical simulations, using the b-spline spectral method, are carried out starting from mean flow initial conditions which are perturbed by the most unstable linear stability eigenfunctions. It is observed that the initial helical instability waves evolve into helical vortices which eventually breakdown into smaller scales of turbulence. 'Rib' structures similar to those seen in incompressible mixing layer flow of Rogers and Moserl are observed. The jet core breakdown stage exhibits increased acoustic radiations. Rao, Ram Mohan and Lundgren, Thomas S. Ames Research Center NCC2-5221...
supersonic mixing of jets and turbulent boundary layers
Author: harry e bailey, arnold m kuothoPublisher:
ISBN:
Category :
Languages : en
Pages : 54
Book Description
Turbulent Mixing Layer Experiment in Supersonic Flow
Author: Hideo IkawaExperimental Investigation of Non-adiabatic Supersonic Slot Injection Into a Supersonic Cross-flow
Author: Kelly Colin TuckerPublisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 278
Book Description
Author: