Universität Stuttgart

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Start date: 1966Institute: search.filters.UBSInstitut.Institut für Wasser- und UmweltsystemmodellierungAuthor: search.filters.author.Westrich, BernhardSubject: search.filters.subject.333.7

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Now showing 1 - 6 of 6
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    An example of a combined discharge-control and aeration structure
    (1983) Kobus, Helmut; Westrich, Bernhard
    The design of a hydraulic structure in a cooling water circuit is described which serves the dual purpose of controlling the water levels in the system upstream and of providing a maximum oxygen uptake without discharging large amounts of air into the subsequent pressure duct in order to avoid blow-out problems.
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    Effects of model configuration, flow conditions and scale in modelling spillway aeration grooves
    (1984) Koschitzky, Hans-Peter; Westrich, Bernhard; Kobus, Helmut
    The hydraulic design of spillways, with high specific discharge usually requires model investigations. Whereas standard small-scale models are sufficient for the assessment of the general flow pattern, studies on cavitation control by means of aeration have to be conducted in detail models at considerably larger scales. Detail models of aeration grooves are studied in order to optimize the geometry and to determine the air entrainment of the grooves. The large model scale necessitates the use of models which represents only a small fraction of the width and length of the spillway. Such sectional models allow only an investigation of a single aeration groove in a given approach flow. This paper presents a hydraulic model study of the spillway of Laiban Dam on the Philippines, which is part of the Manila Water Supply Project III.
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    Strömungsmechanische Probleme bei der Kühlwasserführung in Kernkraftwerken
    (1979) Kobus, Helmut; Naudascher, Eduard; Richter, Andreas; Westrich, Bernhard
    Die hydraulischen Probleme beim Entwurf der Bauwerke im druckfreien Teil des Kühlwasserkreislaufs (Entnahme- und Verteilerbauwerk, Kraftschlußbecken, Kühltasse) werden beschrieben. Es werden die Anforderungen an die hydraulische Leistungsfähigkeit des Kühlsystems zur Realisierung von Frischwasser-, Ablauf-, Kreislauf- und Mischkühlung skizziert, sowie versuchstechnische und numerische Lösungsmöglichkeiten an Hand ausgeführter repräsentativer Untersuchungen an bestehenden und geplanten Kraftwerken aufgezeigt.
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    Strahlerosion
    (1983) Westrich, Bernhard; Kobus, Helmut
    Tiefgetauchte Strahlen können auf beweglichen Gewässersohlen erhebliche Auskolkungen hervorrufen. Die Erosionswirkung ist stark abhängig von der Größe des hydrodynamischen Sohldrucks und der Durchlässigkeit des körnigen Sohlmaterials. Abhängig von der Intensität des Strahlangriffs bilden sich zwei charakteristische Kolkformen mit unterschiedlichem Auskolkungsverhalten aus. Periodische Pulsationen der Strahlgeschwindigkeit verändern das Strömungsfeld in Sohlennähe und bewirken eine Steigerung der Erosionsrate.
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    Flow field and scouring effects of steady and pulsating jets impinging on a movable bed
    (1979) Kobus, Helmut; Leister, Peter; Westrich, Bernhard
    The flow field and erosion pattern of continuous and pulsating impinging jets has been studied experimentally. The mean velocity field as well as turbulent and pulsation components, wall pressure and wall shear stress distributions were investigated in an axisymmetric air jet impinging upon a rough wall. The results show how harmonic velocity pulsations at the nozzle affect both the mean and the turbulent flow field. Corresponding erosion tests with a vertical water jet impinging upon a uniform sand bed exhibited under certain conditions a greatly enhanced erosion rate. The increase in erosion capacity due to pulsation seems to be due to both the changes in the mean flow field and to the greatly increased lateral correlation of the velocity field in the impinging region.
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    Hydraulic design considerations for cooling tower collector basins
    (1979) Kobus, Helmut; Westrich, Bernhard
    Conventional collector basins of natural draft cooling towers have a tendency towards rapid sedimentation. In order to avoid this problem, a shallow type of basin with a system of draining canals is developped. Numerical calculations supplemented by hydraulic model tests yield depths, velocities and energy losses in the system. Prototype measurements are shown to be in good agreement with numerical and experimental predictions for all modes of operation.