Die Kreiselpumpen by C. Pfleiderer (auth.)

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By C. Pfleiderer (auth.)

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13 angegebenen Gründen in Wirbelform ablöst. Der in der reibungslosen Flüssigkeit vorhandene Druckanstieg bleibt also mehr oder weniger aus, so daß die Summe der auf den Körper wirkenden Normalkräfte nicht mehr Null ist. ), die reine Oberflächenreibung um ein Mehrfaches. Abb. 27 und 27 a veranschaulichen die Ausbildung und Ablösung der Wirbel bei Beginn der Strömung um einen Zylinder 3 • Der Energieinhalt der abgehenden Wirbel hat seinen Gegenwert in der zur Überwindung des Druckwiderstandes nötigen Arbeit.

VDI 1913 S. 679. 22 C. Strömung der wirklichen Flüssigkeiten. wobei r sich mit y verändert. Die Subtangenten der Cm-Kurve sind auch hier gleich. dem Krümmungshalbmesser e. Experimentelle Verfahren sind hier zwar möglich\ aber wenig zweckmäßig. b) Strömung mit Umfangskomponente Cu. Liegt neben der bisher betrachteten Meridianströmung auch ein Kreisen um die Achse vor, so kann man die Strömung so entstanden denken, daß man über die Meridianströmung die Rotationsströmung lagert, d. h. die Geschwindigkeiten geometrisch und die Drücke zahlenmäßig addiert 2 • An den Meridiangeschwindigkeiten Cm, die jetzt die Komponenten der resultierenden Geschwindigkeit in der Meridianebene bedeuten, ändert sich dann nichts, folglich auch nichts an den vorstehend abgeleiteten Ergebnissen.

Im Falle der Verengung wird das Vorzeichen von 8 offenbar negativ, hv aber wieder positiv. Beim Kniestück gleichbleibenden Querschnitts wird lc1 1= lc 2 1= Iei und 8 = 2csin~/2, also (34) Nach Bambach 2 ist rp = 1 für ~ = 0--:-- 7° oder bei Einbau sehr vieler Führungswände, sonst kleiner 3 • denn bei der Vernichtung der Stoßgeschwindigkeit 8 durch den zunächst als onelastisch betrachteten Stoß erzeugt die Komponente 8" = 8 cosß parallel zur Stoßfläche (Abb. 31) eine Stoßkraft und damit einen Druckzuwachs.

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