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Untersuchung Über Den Einfluß Der Spaltbreite Zwischen Propelleraußenrand Und Düseninnenwand Auf Den Wirkungsgrad Von Ummantelten Kaplanschrauben

Untersuchung Über Den Einfluß Der Spaltbreite Zwischen Propelleraußenrand Und Düseninnenwand Auf Den Wirkungsgrad Von Ummantelten Kaplanschrauben

          
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About the Book

Der Einfluß der Propellerspaltbreite, der in [14] bereits festgestellt wurde, zeigt die von mehreren Autoren - besonders von H. E. DrcKMANN - angedeutete Tendenz, daß mit kleiner werdendem Spalt vermehrter Propellerschub erzeugt wird. Es wurden Spaltbreiten von 0,8 bis 3,0 mm und 0,6 bis 2,0 mm unter- sucht. Der Wirkungsgradabfall ist beim Doppeldüsensystem 60/61 in Verbin- dung mit Propeller 116 R in Richtung größerer Schubbelastungsgrade zuneh- mend. Dieses Ergebnis entspricht demjenigen für Eindüsen [12]. In Verbindung mit Propeller 95 R ist der Wirkungsgradabfall des Doppeldüsensystems 60/61 kleiner als bei Propeller 116 R. Mittlere Schubbelastungsgrade ergeben den höch- sten Abfall des Wirkungsgrades. Entgegengesetzt hierzu verläuft der Wirkungsgradabfall beim Doppeldüsen- system 60/63; der niedrigste Schubbelastungsgrad hat den höchsten Wirkungs- gradabfall zur Folge. Es zeigt sich, daß lezteres System gegenüber größeren Spalt breiten bei mittleren Schubbelastungsgraden unempfindlicher ist; d. h. es hat eine geringere Leistungs- einbuße als Doppeldüsensystem 60/61 und gemäß seinem Aufbau vermutlich auch gegenüber dem Eindüsensystem 60 zu verzeichnen. Die in [15] gegebenen Gestaltungsrichtlinien werden durch die Ergebnisse der untersuchten Doppeldüsensysteme 60/61 und 60/63 voll bestätigt. Die Grenze der Anwendbarkeit der Doppeldüsen nach schwächeren Schubbe- lastungsgraden hin wird durch die Kombination der Schraube 95 R mit Doppel- düsensystem 60/61 angegeben, da hier nur Verbesserungen von weniger als 1,3% gegenüber dem Eindüsensystem 60 erreicht wurden. Im Wirkungsgradmaximum ist sogar eine Verschlechterung von 3% festzustellen.


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Product Details
  • ISBN-13: 9783663064749
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Binding: Paperback
  • Height: 244 mm
  • No of Pages: 75
  • Series Title: Forschungsberichte Des Landes Nordrhein-Westfalen
  • Weight: 136 gr
  • ISBN-10: 3663064743
  • Publisher Date: 01 Jan 1965
  • Edition: 1965 ed.
  • Language: German
  • Returnable: Y
  • Spine Width: 4 mm
  • Width: 170 mm


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Untersuchung Über Den Einfluß Der Spaltbreite Zwischen Propelleraußenrand Und Düseninnenwand Auf Den Wirkungsgrad Von Ummantelten Kaplanschrauben
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Untersuchung Über Den Einfluß Der Spaltbreite Zwischen Propelleraußenrand Und Düseninnenwand Auf Den Wirkungsgrad Von Ummantelten Kaplanschrauben
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