The peripheral jet pump is examined in both theoretical and in practical applications. One-dimensional, force-momentum theory is applied in a jet pump setting for incompressible fluids. Results from a laboratory model are used for applications design. The scope of practical applications examined include: 1) use as a fish pump, 2) as part of a crab-sampling device, 3) feasibility as a ship's bow thruster. The laboratory tests revealed the inadequacy of the current theory for wide jet spray patterns. The benefit of wide jets on suction and non-benefit on lift performance were established. Other performance aiding factors such partial submergence, partial blockage, and having the jets located at the suction inlet are studied for one phase, two phase and three phase pumping. Also, as a complement to the written theory, computer programs which model the theoretical performance of peripheral jet pumps are available on 5.25" floppy disks. The programs are written for use on IBM PC and compatible computers. *IBM is a registered trademark of International Business Machines. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

In the present work, investigations are carried out for the ultimate use of the "Bis table Fluid Amplifier" as an alternator to produce intermittent vertical water slugs. The effect of some geometrical and flow variables on the amplifier characteristics used in a vertical position, is studied experimentally. The minimum control flow required to switch the main power jet from one wall to the other is obtained as a function of the main jet flow rate, the splitter angle and its distance from the main nozzle. The efficiency of the amplifier functioning as a pressure recovery device is determined in relation to the output load. Theoretical and experimental results are compared. Some aspects of downwards air water flow in long vertical tubes are investigated. The formation of a spherical-cap air slug in an overflow pipe, and the behaviour and stability of the air-water interface in the tube are studied with the aid of motion picture films. Finally, a theory is appended concerning the transient polytropic compression of a gas in a vertical tube by a high velocity falling liquid slug from a constant flow supply.

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Jet pumps are among the components of automotive FC systems (FCS) whose design need to be optimally tailored in order to improve the system efficiency. We had concluded that the ejector CFD model needed to optimize the design had to meet the requirements of being both complete enough, so that a realistic simulation of the FC system is attained, and computationally light, so that the CFD computations could be run embeded into real-time dynamic simulations of the FCS anode loop. Whereas we previously employed unstructured tetrahedral meshes, leading to excessive cell counts, our present work involves block-structured grids of purely hexahedral cells, resulting in a cell count an order of magnitude smaller. To ease our block-structure strategy, the previous geometry was slightly simplified. Our results agree with performance data already published. / Strahlpumpen gehören zu den Komponenten von Automotive FC-Systemen (FCS), deren Konstruktion optimal zugeschnitten werden muss, um die Systemeffizienz zu verbessern. Wir hatten zu dem Schluss gekommen, dass das Ejector CFD-Modell, das zur Optimierung des Designs benötigte, die Anforderungen des Seins vollständig genug erfüllen musste, so dass eine realistische Simulation des FC-Systems erreicht wird, und rechenlich leicht, so dass die CFD-Berechnungen eingebettet werden könnten Echtzeit-dynamische Simulationen der FCS-Anodenschleife. Während wir zuvor unstrukturierte Tetraedral-Meshes eingesetzt hatten, was zu übermäßigen Zellzählungen führte, beinhaltet unsere vorliegende Arbeit blockstrukturierte Gitter aus rein hexaedrischen Zellen, was zu einer Zelle führt, die eine größere Größenordnung darstellt. Um unsere Blockstrukturstrategie zu erleichtern, wurde die vorherige Geometrie leicht vereinfacht. Unsere Ergebnisse stimmen mit bereits veröffentlichten Leistungsdaten überein.