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8/19/2019 02 Canal Circular
1/1
Pregunta 3
Calcule el tirante, velocidad media, número de Froude e indique el régimen de flujo .
≔Q 0.6 m3/s ≔d 0 0.90m ≔n 0.024 ≔S0 0.015 m/m
SOLUCIÓN:≔ A →⋅
1
8−θ sin θ d 0
2+⋅0.10125 θ ⋅−0.10125 sin θ
≔P →⋅⋅1
2θ d 0 ⋅0.45 θ
≔R →⋅1
4
⎛
⎝ −1
sin θ
θ
⎞
⎠ −
1
4
sin θ
⋅4 θ
≔T →⋅2 ⋅y −d 0 y ⋅2 − ⋅y −y 0.9
≔D → A
T
+⋅0.10125 θ ⋅−0.10125 sin θ
⋅2 ‾‾‾‾‾‾‾‾‾‾− ⋅y −y 0.9
― →=Q ⋅⋅1n A
5
3
P
2
3
S0
1
2 ,float 3=0.6 ⋅
5.1 +⋅
0.101 θ ⋅−
0.101 sin θ
5
3
⋅0.45 θ
2
3
≔f θ ― →−Q ⋅⋅1
n
A
5
3
P
2
3
S0
1
2 ,float 3−0.6
⋅5.1 +⋅0.101 θ ⋅−0.101 sin θ
5
3
⋅0.45 θ
2
3
V a l o r e s d e
p r u e b a
R e s t r
i c c i o n e s
S o l v e
r
≔θ 0.9
=f θ 0
≔θ =find θ 3.1462
=θ 3.1462 rad =d 0 0.9
≔ A ― →⋅1
8−θ sin θ d 0
2 ,float 30.319 = A 0.319
≔D =→D ―――――――――+⋅0.10125 θ ⋅−0.10125 sin θ
⋅2 ‾‾‾‾‾‾‾‾‾‾− ⋅y −y 0.90.354
Entonces obtenemos el tirante:
=−2 π θ 3.137 ≔ x =⋅cos⎛
⎝――
−2 π θ
2
⎞
⎠
d 0
20.001
≔y =+ x d 0
20.451 m
=D 0.354
Velocidad: ≔V =Q
A1.881m/s ≔g 9.81 m/s2
Número Froude: ≔F =V
‾‾‾⋅g D
1.009 (>1 , se produce flujo supercritico )