Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems. Task 3: Advanced Fan Section Grid Generator Final Report and Computer Program User's Manual

A procedure is studied for generating three-dimensional grids for advanced turbofan engine fan section geometries. The procedure constructs a discrete mesh about engine sections containing the fan stage, an arbitrary number of axisymmetric radial flow splitters, a booster stage, and a bifurcated core/bypass flow duct with guide vanes. The mesh is an h-type grid system, the points being distributed with a transfinite interpolation scheme with axial and radial spacing being user specified. Elliptic smoothing of the grid in the meridional plane is a post-process option. The grid generation scheme is consistent with aerodynamic analyses utilizing the average-passage equation system developed by Dr. John Adamczyk of NASA Lewis. This flow solution scheme requires a series of blade specific grids each having a common axisymmetric mesh, but varying in the circumferential direction according to the geometry of the specific blade row

Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 4: Advanced fan section aerodynamic analysis

The purpose of this study is the development of a three-dimensional Euler/Navier-Stokes flow analysis for fan section/engine geometries containing multiple blade rows and multiple spanwise flow splitters. An existing procedure developed by Dr. J. J. Adamczyk and associates and the NASA Lewis Research Center was modified to accept multiple spanwise splitter geometries and simulate engine core conditions. The procedure was also modified to allow coarse parallelization of the solution algorithm. This document is a final report outlining the development and techniques used in the procedure. The numerical solution is based upon a finite volume technique with a four stage Runge-Kutta time marching procedure. Numerical dissipation is used to gain solution stability but is reduced in viscous dominated flow regions. Local time stepping and implicit residual smoothing are used to increase the rate of convergence. Multiple blade row solutions are based upon the average-passage system of equations. The numerical solutions are performed on an H-type grid system, with meshes being generated by the system (TIGG3D) developed earlier under this contract. The grid generation scheme meets the average-passage requirement of maintaining a common axisymmetric mesh for each blade row grid. The analysis was run on several geometry configurations ranging from one to five blade rows and from one to four radial flow splitters. Pure internal flow solutions were obtained as well as solutions with flow about the cowl/nacelle and various engine core flow conditions. The efficiency of the solution procedure was shown to be the same as the original analysis

Examining learning in relation to the contexts of use of ICT

Although ICT resources are commonly expected to produce uniform benefits, they are necessarily employed within pre-existing contexts of educational and social activity, and the outcome in terms of both pattern of use and learning depends on how they fit in with these. As a result, the same technology or software may have unexpectedly diverse effects, according to specific setting. If the object is to exercise control over outcome, then the conditions of use need to be planned for within the design and implementation of the technology. In order to do this, it is crucial that research gathers data on how outcomes are affected by the interplay between technology and context. This raises questions about the methods that would be appropriate for the conduct and dissemination of such research. These points are discussed in relation to three studies, one each at primary, secondary and university levels of education

Toward a More Perfect Union: The Unitimely Decline of Federalism and the Rise of the Homogeneous Political Culture

The principle of federalism and the national government\u27s evolving relationship with the states has created many challenging moments over the course of American history. As the 21st century begins to unfold, however, the decline of this political balance has the potential to generate even greater challenges with far-reaching implications. From the closing battle of the Revolutionary War to the Gun-Free School Zones Act, this article charts the evolution of this intricate national relationship with a view toward better understanding of the rise of the homogenous political culture and the ways such a phenomenon might be reversed

Molybdenite at Crown Point, Washington

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Case Studies of the Attainment of Insight in Dream Sessions: Replication and Extension

To replicate and extend the Hill, Knox, et al. (2007) case study of a client who attained insight in one session of dream work, the authors examined two additional single-session cases: one in which a client gained insight and another in which a client did not. The observations across all three cases suggest that the two clients who acquired insight had positive attitudes toward dreams; were motivated and involved in session; and were nonresistant, trusting, and affectively present but not overwhelmed. The client who did not gain insight questioned the value of dreams and was resistant, untrusting, andf emotionally overwhelmed. Therapist adherence and competence using the dream model, ability to manage countertransference, and effective use of probes for insight distinguished the therapists whose clients gained insight from the therapist whose client did not