Author: Jack Denton MattinglyPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 926
Book Description
Experimental Investigation of the Mixing of Highly Swirling Flows
Author: Jack Denton MattinglyPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 926
Book Description
An Investigation of the Mixing of Linear and Swirling Flows
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 86
Book Description
A research program was conducted to study in detail the importance of various aerodynamic and geometric parameters on the dissipation of a concentrated trailed vortex in which the dissipation is greatly enhanced by the continuous injection of a mass of air into its core. The basic results of the research program demonstrated that the efficiency of vortex dissipation would be maximized by designing the injection system so that the vortex was injected at its center and parallel to the axis of the trailed vortex core with a linearly- directed mass of air at sonic speeds. The efficiency of the optimum system was shown to be almost an order of magnitude better than had been demonstrated previously.
Scientific and Technical Aerospace Reports
Author: The Mixing of Swirling Flows
Author: Gordon C. OatesPublisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
The results of an investigation of the effects of swirling the inner stream upon the mixing rate of co-annular flows will be presented. The presentation will consist of three major sections: Model Of An Ideal Mixer With Swirl--The overall investigation was motivated by the desire to lead to understanding of some of the mechanisms existing in real aircraft mixers. To this end, the effects of swirl upon the performance of ideal mixers was determined so that the unavoidable losses due to the presence of non-axial momentum etc. could be determined (in comparison to conventional ideal mixers). EXPERIMENTAL PROGRAM--A large high pressure air storage system has been adapted to provide flow rates of up to a total of ten pounds per second. PRELIMINARY RESULTS--The data is in the process of being reduced and interpreted.
The Fluid Mechanics of Swirling Flow Within Annular Regions
Author: Robert MilanoDiscovery
Author: United States Air Force AcademyPublisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 172
Book Description
An Experimental Investigation of Mixing in Buoyant Flows
Author: Hamid JohariAn Experimental Investigation of Turbulent Mixing of Fluids with Different Dynamically Significant Scales
Author: Barry Lee GilbertPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 538
Book Description
Experimental Investigation of Mixing Process in a Two-layer Strapified Flow in an Annulus
Author: Aavraham ChaiAn Experimental Investigation of Mixing in Two-dimensional Turbulent Shear Flows with Applications to Diffusion-limited Chemical Reactions
Author: John Harrison KonradPublisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 220
Book Description
The extent of molecular mixing in several two-dimensional free turbulent shear flows was measured using a concentration probe with a frequency response of 100 kHz and a spatial resolution of 0.1 mm. The flows investigated were (i) a shear layer in which the gases on either side of the layer are of unequal density, (ii) a shear layer in which the gases on either side of the layer are of equal density, and (iii) a wake in which the gases on either side of the wake are of unequal densities. The extent of mixing was measured as a function of Reynolds number for the first case. It was found that at a critical Reynolds number the extent of molecular mixing sharply increased (25%). Power spectral density curves of the concentration time histories also indicated a marked increase in the high frequency fluctuations above this Reynolds number. A shadowgraph investigation of this phenomenon revealed that three-dimensional Taylor-type vortices whose axes of rotation are basically in the flow direction exist in the flow in addition to the two-dimensional large structures previously observed. These Taylor vortices were found to be unstable above the critical Reynolds number and were producing the increase in molecular mixing. The growth and development of the two-dimensional large structures were found to be basically unaffected by this instability. It is proposed that the fully developed turbulence of shear flows is maintained by a combination of the development of the large structures and of the coupling between the large structures and these unstable Taylor vortices.