Wzory wyjściowe i wynikowe:
Równanie równowagi płynu: Xdx + Ydy + Zdz = 0
X = ω2x ; Y = ω2y ; Z = -g
$z = \frac{r^{2}\omega^{2}}{2g} + z_{0}$
$$z_{0} = H - \frac{1}{2} \bullet (r^{2} - \frac{1}{2}R^{2})$$
$$z = H + \frac{\omega^{2}}{2g}(r^{2} - \frac{1}{2}R^{2})$$
Tabele pomiarów i wyników obliczeń:
Tabela 1. Zestawienie wartości przyjętych do wykonania ćwiczenia
H | n1 | n2 | n3 | R | ω1 | ω2 | ω3 |
---|---|---|---|---|---|---|---|
mm | obr/min | obr/min | obr/min | mm | rad/s | rad/s | rad/s |
82,86 | 186 | 223 | 243 | 45 | 19 | 23 | 25 |
Tabela 2. Zestawienie wyników pomiarów oraz obliczeń
Lp. | x | z1 | z2 | z3 | z'1 | z'2 | z'3 | z1teo | z2teo | z3teo |
---|---|---|---|---|---|---|---|---|---|---|
mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | |
1. | 0,00 | 19,61 | 27,47 | 33,67 | 63,25 | 55,39 | 49,19 | 63,28 | 54,72 | 49,44 |
2. | 5,00 | 19,58 | 27,04 | 33,30 | 63,28 | 55,82 | 49,56 | 63,66 | 55,26 | 50,08 |
3. | 10,00 | 18,26 | 25,88 | 31,00 | 64,60 | 56,98 | 51,86 | 64,78 | 56,87 | 52,00 |
4. | 15,00 | 16,28 | 22,86 | 27,95 | 66,58 | 60,00 | 54,91 | 66,65 | 59,56 | 55,19 |
5. | 20,00 | 13,93 | 19,01 | 22,33 | 68,93 | 63,85 | 60,53 | 69,27 | 63,33 | 59,67 |
6. | 25,00 | 9,42 | 12,56 | 16,38 | 73,44 | 70,30 | 66,48 | 72,64 | 68,17 | 65,42 |
7. | 30,00 | 4,07 | 5,07 | 7,33 | 78,79 | 77,79 | 75,53 | 76,76 | 74,09 | 72,45 |
8. | 35,00 | -0,93 | -4,47 | -1,54 | 83,79 | 87,33 | 84,40 | 81,63 | 81,09 | 80,75 |
9. | 40,00 | -9,28 | -14,26 | -16,10 | 92,14 | 97,12 | 98,96 | 87,24 | 89,16 | 90,34 |
10. | 44,00 | -16,13 | -23,30 | -27,85 | 98,99 | 106,16 | 110,71 | 93,60 | 98,30 | 101,20 |
Przykłady obliczeń:
Na przykładzie pomiaru nr 5 dla ω2 (w protokole nr 15)
x= 20 mm
H= 82,86
z'2 = H - z2 = 82,86 – 19,01= 63,85 mm ≈ 64 mm
ω2 = $\frac{2\pi n_{2}}{60} = \frac{2\pi \bullet 186}{60}$ = 19,488 rad/s ≈ 19 rad/s
$z_{2teo} = H + \frac{\omega_{2}^{2}}{2g}\left( x^{2} - \frac{1}{2}R^{2} \right) = \left( \frac{82,86}{1000} + \frac{{23,35}^{2}}{2 \bullet 9,81}\left( 20^{2} - \frac{1}{2}\left( \frac{45}{1000} \right)^{2} \right) \right) \bullet 1000 = 63,33\ \text{mm}$ ≈ 63 mm