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[graphic]

V2

werth v2

Ga (vergl. S. 245), 2) den Mittel

G2

2

F2

(vergl. S.258 und 261).

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[graphic]

2gh

1) v2

(s. S. 251),

G2

2 G

G2

2+

F2 F

K2

V

2ab

2 G

2

F

2) Mittelwerth v2 =

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Der volle Ausfluss bei Verlust durch den freien Fall des Wassers giebt bei 0,76 Zuführungshöhe

v2

v2 = 4/5 V2g. 1,764/5. 1,30 V2 gb = 1,40 V2gb. Höhe h、 der Wassersäule nach Seite 256

hx = (a+b) (12 23 − 1) + b = 1,76 (16/25 — 1) + b -b-1,7.9/256=0,4b.

3) Nehmen wir unter Beibehaltung der übrigen Verhältnisse eine Druckhöhe h ban, so erhalten wir db9/16h (s. Beisp. 1) b— 9/16b16b; b.

es müsste also für den vollen Ausfluss bei mit Wasser gefüllter Röhrentour dieselbe von der Höhe 7/166 an erweitert werden, bei einer gleich weiten Röhrentour mit 0,16 Zuführungshöhe kann der volle Ausfluss nicht stattfinden. Für vollen Ausfluss mit Arbeitsverlust ist nach Seite 246

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Für Verlust durch den freien Fall des Wassers und vollen Ausfluss beim Eintritt des Wassers in das Ge

fäss D ist wie oben v1⁄2 0,84 V2gh und hx=0,6b.

5) Es sei F=3/2 F1 und G-2 F1, c=0, also K-∞. Bei der Einmündung der Röhre A in das Gefäss D seien die Kanten abgerundet, so dass voller Ausfluss stattfinden kann; der Uebergang zur Gefässmündung sei allmälig erweitert hergestellt. Es ist nach Abschnitt II. A. b. «) (S. 244) d≥ h (1 − 63)+b, also für unser Beispiel dh (1-4)+bb-3h; es muss also für vollen Ausfluss h<--- sein. Nehmen wir

[blocks in formation]

3

G2

an. Für h == ist d= 0, es kann also bei

3

gleich weiter und mit Wasser gefüllter Röhrentour kein

Findet voller Arbeitsverlust statt, so wird

໑.

[ocr errors]

1 +

2gh G2 F12 F2

G2 =

V

b

2g.

3 0,3 V2g b.

1+4 - 16/9

Tritt aber das Verhalten des vollen Ausflusses bei gleichzeitigem Verlust durch den freien Fall des Wassers ein, so wird nach S. 261

Fi

=

2

งน

G

V 2 g (a + b) — 1 1⁄2 V2g (a+b) 0,05 b

1

[blocks in formation]

und für a =

1/2 V2g. 1,05 b und nach A. a) S. 262

hx = b— (a+b)(1 − 1123) = b — 1,05 (1—1/4) b

[ocr errors]

G2

= 0,21 b.

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