tn cơ lưu chất 1 2 3b 5a 6
TRANSCRIPT
![Page 1: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/1.jpg)
BAØI 1: THUÛY TÓNHBaûng 1: Keát quaû ño ñaïc
TT L1 L3 L4 L5 L61 23.0 40.0 17.2 33.9 22.8 2 23.0 29.0 22.6 28.5 28.7 3 23.0 8.0 33.5 17.9 41.3
TT L21 L22 L23 Ghi chuù1 42 41 40.32 32.3 30.4 29.73 10.9 9 8.3
Aùp suaát vaø nhieät ñoä khoâng khí khi tieán haønh thí nghieäm laøPa = 760 mmHg 29==> ñoåi ra Pa = 101,437 N/m²
troïng löôïng rieâng cuûa nöôùc laø:g = 9,767 N/m³
Baûng 2: Keát quaû tính toaùnTT 10³N/m² % 10³N/m³1 103.10 1.66 0.71 9.94 8.742 102.02 0.59 1.79 9.93 8.143 99.97 -1.47 0.79 9.39 8.42
pt pd d r g4-5 g6-7
![Page 2: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/2.jpg)
Baûng 1: Keát quaû ño ñaïc
L7 L8 L9 L10 Ghi chuù 41.8 18.0 19.0 40.0 35.9 18.4 18.6 29.0 23.9 19.0 18.0 8.0
735760
Baûng 2: Keát quaû tính toaùn
10³N/m³ %166.04 1.31 1.23 10.71293.01 3.48 3.18 51.79146.51 1.43 1.36 10.79
g8-9 d g4-5 d g6-7 d g8-9
![Page 3: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/3.jpg)
BAØI 2: THÍ NGHIEÄM REYNOLDS
27Tra baûng ñöôïc n = 8.60E-03Ñöôøng kính oáng quan saùt laø D= 1.4
Baûng 1: Doøng chaûy chuyeån töø taàng sang roái
Tröôøng hôïp Theå tích W Löu löôïng(cm³) Q (cm³/s)
110s W1 = 40 4.00 10s W2 = 39 3.90 10s W3 = 38 3.80
210s W1 = 70 7.00 10s W2 = 71 7.10 10s W3 = 69 6.90
310s W1 = 134 13.40 10s W2 = 136 13.60 10s W3 = 137 13.70
410s W1 = 233 23.30 10s W2 = 235 23.50 10s W3 = 232 23.20
Baûng 2: Doøng chaûy chuyeån töø roái sang taàng
Tröôøng hôïp Theå tích W Löu löôïng(cm³) Q (cm³/s)
110s W1 = 241 24.10 10s W2 = 243 24.30 10s W3 = 240 24.00
210s W1 = 170 17.00 10s W2 = 174 17.40 10s W3 = 172 17.20
310s W1 = 108 10.80 10s W2 = 110 11.00 10s W3 = 106 10.60
410s W1 = 63 6.30 10s W2 = 60 6.00 10s W3 = 61 6.10
Nhieät ñoä nöôùc t = 280C
![Page 4: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/4.jpg)
cm²/scm
Baûng 1: Doøng chaûy chuyeån töø taàng sang roái
Vaän toác(cm³/s)
3.90 2.53 412.64
7.00 4.55 740.63
13.57 8.82 1,435.41
23.33 15.17 2,468.77
Baûng 2: Doøng chaûy chuyeån töø roái sang taàng
Vaän toác(cm³/s)
24.13 15.69 2,553.41
17.20 11.18 1,819.84
10.80 7.02 1,142.69
6.13 3.99 648.93
QTB ReTBVTB (cm/s)
QTB ReTBVTB (cm/s)
![Page 5: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/5.jpg)
BAØI 3: PHÖÔNG TRÌNH NAÊNG LÖÔÏNG
Baûng 1: Döõ lieäu ño ñaïc löu löôïngLaàn V ñaàu (lít) V cuoái (lít) Thôøi gian (s)
1 0 5 28.762 5 10 32.253 10 15 32.28
Q trung bình 0.161
Baûng 2: Keát quaû ño möïc nöôùc treân daøn aùp keá
Oáng Maët caétÑo ñoàng thôø ñoä daâng
Lj vaø L8 taïi töøng MCLj
1 a 25.00 24.50 2 b 13.90 19.00 3 c 11.90 13.50 4 d 10.70 8.50 5 e 10.00 10.00 6 f 25.00 11.50
g = Baûng 3
Maët caét V V²/2g u²/2gcm/s cm cm
a 32.87 0.55 0.50 b 106.32 5.76 5.90 c 145.07 10.73 11.20 d 179.43 16.41 16.10 e 205.43 21.51 14.50 f 32.87 0.55 2.00
Baûng 4Ñoaïn doøng chaûy a-e (cm) e-f (cm)Toån thaát hf -21.36 34.56
Ñöôøng kính tieát dieän
(mm)
![Page 6: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/6.jpg)
Baûng 1: Döõ lieäu ño ñaïc löu löôïngLöu löôïng Q (l/s)
0.174 0.155 0.155
l/s
Baûng 2: Keát quaû ño möïc nöôùc treân daøn aùp keáÑo ñoàng thôø ñoä daâng Ñoä daâng nöôùc
Lj vaø L8 taïi töøng MC khi khoâng coù kimL8
25.00 24.60 24.90 19.50 24.70 15.00 24.60 10.00 24.50 25.00 13.50 11.40
981 cm/s2
u Nhaän xeùt
31.32 107.59 148.24 177.73 168.67 62.64
a-f (cm) 13.20
L8-Lj = 14,4-14,0
![Page 7: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/7.jpg)
Baûng 1: Soá lieäu ñoZ chuaån =
TT I Keát quaû ño möïc nöôùc treân daøn aùp keá (cm)(A) Oáng 1 Oáng 2 Oáng 3 Oáng 4
1 25.0 41.0 71.7 2 23.5 43.0 66.0 3 22.0 45.3 60.8 4 20.0 47.0 54.8 64.5 73.5 5 19.5 49.0 55.7 63.0 69.5 6 19.0 52.3 56.5 61.5 66.5 7 18.5 54.0 57.0 60.7 64.0 8 18.0 50.5 57.5 60.0 62.0
Baûng 2: Quan heä hd vaø Lchoïn I = 20.0 19.0 18.0
Maët caét L Q = 7.69 Q = 5.07 Q = 3.89(m) hd
4-3 3 9.0 5.0 2.0 4-2 6 18.7 10.0 4.5 4-1 9 26.5 14.2 11.5
Baûng 3:n =
TT I (A) Q (l/s) hd (cm) l Re1 18.0 3.89 7.0 0.25 57,959 2 18.5 4.54 3.0 0.08 67,631 3 19.0 5.07 4.2 0.09 75,524 4 19.5 5.95 6.7 0.10 88,552 5 20.0 7.69 7.8 0.07 114,528 6 22.0 8.81 15.5 0.11 131,131 7 23.5 13.96 23.0 0.06 207,956 8 25.0 16.06 30.7 0.07 239,212
Döïa vaøo ñoà thò Moody tra baûng ñöôïc giaù trò gaàn ñuùn0.045 Suy ra D 4.788
Baûng 4:TT I (A) Q (l/s) hcb (cm) z
1 18.0 3.89 - - 2 18.5 4.54 - - 3 19.0 5.07 - - 4 19.5 5.95 - - 5 20.0 7.69 - -
-
==> döïa vaøo caëp giaù trò l vaø Re ta keát luaän doøng chaûy naøy laø khu chaûy roái thaønh nhaùm hoaøn toaøn
D/D =
Giaù trò trung bình cuûa z
![Page 8: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/8.jpg)
Baûng 1: Soá lieäu ñoZ chuaån = 26.4 cm
Keát quaû ño möïc nöôùc treân daøn aùp keá (cm) ZOáng 5 Oáng 6 (cm)
9.510 10.430 13.120
- - 13.820 - - 15.050 - - 15.750 - - 16.210 - - 16.820
g = 981lít/s
Oáng 4 - oáng 3Oáng 4 - oáng 2Oáng 4 - oáng 1
8.04E-03 cm²/s
0.58 hd = oáng 2 - oáng 1 0.68 D = 10.64 cm 0.76 ==> A = 88.87 0.89 A² = 7897.79 1.15 L1-2 = 300 1.31 tính Re = VD/veta 2.08 2.39
mm
d = 7.01 cm==> A = 38.57
A² = 1488.03
vaø Re ta keát luaän doøng chaûy naøy laø khu chaûy roái thaønh nhaùm hoaøn toaøn
![Page 9: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/9.jpg)
Baûng 1: Bôø traøn tam giaùcZ chuaån = 19.21 cm
STT
Soá lieäu thí nghieäm Soá lieäu tính toaùn
Zi V t Qi H Q2/5 Cd Lenz
cm lít s lít/s cm cm cm³/s
116.61 5 28.93 0.17
16.57 2.64 198.69 8.30 0.743 0.580 16.54 5 24.06 0.21 16.56 5 23.21 0.22
215.85 5 13.64 0.37
15.77 3.44 384.08 10.81 0.739 0.577 15.74 5 12.57 0.40 15.71 5 12.89 0.39
315.01 5 8.77 0.57
15.01 4.20 596.85 12.89 0.699 0.575 15.02 5 8.29 0.60 15 5 8.10 0.62
414.25 5 5.45 0.92
14.26 4.95 905.95 15.23 0.703 0.574 14.27 5 5.49 0.91 14.26 5 5.62 0.89
Baûng 2: Bôø traøn chöõ nhaätZ chuaån = 14.59 cm
STT
Soá lieäu thí nghieäm Soá lieäu tính toaùn
Zi V t Qi H log(H) log(Q)
cm lít s lít/s cm cm cm³/s
1 13.21 5 15.58 0.32
13.27 1.32 332.92 0.12 2.52 0.736 0.612
13.28 5 14.58 0.34
Zt. bình
Qt. bình
CdThí
nghieäm
Zt. bình
Qt. bình
CdThí
nghieäm
Cd Tsugaev
![Page 10: Tn Cơ Lưu Chất 1 2 3b 5a 6](https://reader036.vdocuments.pub/reader036/viewer/2022082411/5695d3b71a28ab9b029eeae9/html5/thumbnails/10.jpg)
1 13.32 5 14.93 0.33
13.27 1.32 332.92 0.12 2.52 0.736 0.612
2 12.96 5 10.86 0.46
12.90 1.69 448.04 0.23 2.65 0.686 0.614
12.95 5 10.14 0.49 12.80 5 12.80 0.39
3 12.73 5 8.47 0.59
12.71 1.88 595.53 0.27 2.77 0.777 0.616
12.72 5 8.28 0.60 12.69 5 8.44 0.59
4 12.17 5 6.13 0.82
8.12 6.47 862.77 0.81 2.94 0.176 0.647
12.18 5 5.50 0.91 12,17 5 5.79 0.86