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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 15:25:36 +0000Supersonic Flow Through Cascades, with Application to Diffusers
https://resolver.caltech.edu/CaltechETD:etd-12102008-131330
Authors: {'items': [{'id': 'Buhler-Rolf-Dietrich', 'name': {'family': 'Buhler', 'given': 'Rolf Dietrich'}, 'show_email': 'NO'}]}
Year: 1948
DOI: 10.7907/FJEG-RM29
Supersonic flow through a two-dimensional cascade of airfoils is discussed from the point of view of one-dimensional gas dynamics. Two generalizations to compressible flow of the usual velocity vector diagrams are discussed, namely the Mach vector and the reduced velocity vector diagram. A relative mass flow parameter is found which represents the isentropic continuity equation on the two vector diagrams, so that for a set of given cascade inlet conditions all possible outlet velocities and directions appear on the diagrams.
The largest possible tangential velocity component and the largest possible change in tangential momentum in a cascade are obtained as functions of the mass flow parameter. From these the largest obtainable stagnation pressure ratio and power of any arrangement of moving and stationary cascades may easily be obtained.
Equations are given for the ratios of relative stagnation temperatures, mass flows and Mach numbers in two systems of reference moving with respect to each other. Methods for tracing graphically on the vector diagrams the flow through a stage are presented.
The possibility of using cascades instead of shock waves for the transition from supersonic to subsonic flow in diffusers is pointed out. As an example a proposed single cascade supersonic diffuser is briefly analyzed by means of the reduced velocity vector diagram.
https://thesis.library.caltech.edu/id/eprint/4934An Experimental and Theoretical Investigation of Two-Dimensional Centrifugal Pump Impellers
https://resolver.caltech.edu/CaltechETD:etd-04072003-091659
Authors: {'items': [{'id': 'Acosta-Allan-James', 'name': {'family': 'Acosta', 'given': 'Allan James'}, 'show_email': 'NO'}]}
Year: 1952
DOI: 10.7907/159P-SA35
<p>An experimental and theoretical investigation on a series of three centrifugal pump impellers has been made in order to determine the usefulness and validity of tyro-dimensional potential theory for the description of the flow. Computed values of the developed head and distribution of pressure on the vane surfaces are compared with measurements an two-, four-, and six- bladed impellers which have 30° logarithmic spiral vanes and a radius ratio of about one-half.</p>
<p>It is found that for operating points where the influence on the flow into the impeller by the inlet turn is least, the agreement between the observed and predicted values is reasonably good, while for other flow rates large discrepancies occur. Although the impeller efficiency is relatively high when the flow is least disturbed by the inlet, the slope of the work coefficient line is steeper than the theoretically predicted value. This deviation is attributed to boundary layers which are observed on the vane surfaces.</p>https://thesis.library.caltech.edu/id/eprint/1282