Strömungsenergie und mechanische Arbeit

Strömungsenergie und mechanische Arbeit

Paul Wagner

72,52 €
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Editorial:
Springer Nature B.V.
Año de edición:
1914
Materia
Ingeniería: general
ISBN:
9783642504792
72,52 €
IVA incluido
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Durch die im Herbst 1911 in Angriff genommene Arbeit über 1 den 'Wirkungsgrad von Dampfturbinenbeschauflungen' ) sah sich der Verfasser veranlaßt, gelegentlich der Erörterungen über die reine Überdruckturbine und die Expansionsdüsen, das Wesen der Ent­ stehung von Energieströmungen in Mündungen und der Arbeitsüber­ tragung von einer Strömung auf eine Maschine kritisch zu unter­ suchen. Das führte auf die einfachen Fragen, w i e entstehen - wegungsgröße P = G !!. . und mittlere Geschwindigkeit !!. . des Sekunden- U 2 arbeitswertes L = G !!. . !!. . einer Strömung und wie aus dieser wied- g 2 um der Sekundenwert der mechanischen Arbeit L =Pu resp. ihre Treibkraft P und ihre Geschwindigkeit u. Bei näherer Betrachtung ergab sich, daß bei konsequenter Verfolgung der abstrakten Vorgänge die Berechnung mancher Formen der Energiewandlung mit weniger Mühe gefunden werden kann, als auf dem Wege der empirischen For­ schung, d. i. über den Umweg der wissenschaftlichen Untersuchung der mehr oder weniger untergeordneten verlustbringenden N ebenerschei­ nungen. Die letztere Methode kennzeichnet im allgemeinen die ge­ bräuchliche theoretische Behandlung von physikalisch-technischen Pro­ blemen, wobei das energetische Pnnzip als ein Faktum in die Kalku­ lation eingeführt wird, ohne nähere Untersuchung der Frage, wie die meßbaren Äußerungen der Energieübertragung, Kraft und Bewegung, im Idealfall von einem Körper auf den anderen übergeleitet werden.

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