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8/10/2019 Bai Tap Thuy Luc 4971
1/9
Bi Tp Nhm Mn: Thy LcBi 6-3 Bm ng c thy lc
Cho N1 = 300 kw 03.0=
L = 1500 m Q = 0.2 m3
/s = !00 m = 0.! m1. "#nh$ N%2. "#nh$ &1' &2
()*)1.&h+ng t,-nh Bcnl) cho mt ct 11 4 22 mt ch6n 00 7
21
2
2
2
2
2
2
1
1
1
122
+++=++ tbhg
VPZ
g
VPZ
17
",ong 89 $ :1= :2= 0
;1= ;2= 0121 ==
"< 17 y ,>$g
v
D
lp
2..
2
=
;?) 03'0= ' l=1500 m' = 0'! m' Q= 0'2 m3/s
@gD
Q
D
lhh dtb
..
.A..
!2
2
21 ==
= 75!'1!A1'B.!'0.
2'0.A
.!'0
1500
.03'0 !2
2
m= "n thDt cEng sDt t,ong 8+Fng Gng
"> c9$ Nw= .Q. ZgVP
++2
2
7
;?)$ = A10N/m3' = 0.!m
Q = 0.2 m3/s ' P
= 1!.5!m
Nhm:9 Trang$ 1
N2
&2&1
N1
00
221 1
L'
8/10/2019 Bai Tap Thuy Luc 4971
2/9
Bi Tp Nhm Mn: Thy Lc
: = 0
;Hy $ Nw= . Q .
++ Z
g
VP
2
2
=
++ Z
gD
QPQ
!2
2A..
Nw = A10 . 0'2
+ A1'B.!'0.1!'3
2'0.A5!.1! !2
2
@Nw =2AIA1%7 = 2A'IA1Jw72. "#nh K sDt &1Mo m tOo ,> tO) 8P 8+Fng Gng 4 K sDt &2t,+?c 8ng c thylc cG) 8+Fng Gng.
"> c9 cEng sDt c> 8ng c thy lc$N2= N1R Nw
= 300 R 2A'IA1 = 2I1'21Jw7CEng sDt c> m$
++= Zg
VPQN2
.2
11
=
gD
Q
Q
NP
!2
2
11
.A
..
;?) := 0
7/10.5'1A1'B.!'0.1!'3
2'0.A
2'0.BA10
10.3.BA10 2S
!2
25
mN=
=
CEng sDt c> 8ng c thy lc$
++= Z
g
VPQN
2.
21
2
?) T=07
=
gD
Q
Q
NP
!2
2
22
.A
..
7/10.35'1A1'B.!'0.1!'3
2'0.A
2'0.BA10
2I121B.BA10 2S
!2
2
mN=
=
BI 6.6L=20m U = 150mm = 2 U = 0'03
Nhm:9 Trang$ 2
B?
z
h
11
3
3
22
0 0
8/10/2019 Bai Tap Thuy Luc 4971
3/9
Bi Tp Nhm Mn: Thy Lcl = 12m U M = 150mm r = S U c = 0'2 ' = 0'030Q= V U &ck= SmW2X: =V()*)$
Bi Gii&h+ng t,-nh Bcnl) cho mt ct 1 1 4 2 R 2
1
0U0U0U
71
2121
2121
21222211
222
211
====
====
+++=++
a
tbg
Vp
g
VP
PPP
VVzzz
hzz
g..
Q.A.I
g
QA
L
21g2;
L
21t !2
2
!2
22
77h
=++=+=
!15'0
15003'0
L.
32121
==
=+=+
"h>y 4o 17 t> 8+Yc
72h:g.
Q.A.I21tN !2
2
==
&h+ng t,-nh Bcnl) cho mt ct 22 4 33 mt ch6n 007
T2=0 U T3= hZT = 2ZT U 2= > U 2=02
!
3 d
QVV
== 132 ==
gd
Q
gd
Q
dlcrtbh !22
!2
2AA
32 .S'A7 =++= "h>y 4o 37 t> 8+Yc$
3223
2332
++++= tbg
VPPhzh
gd
Q
gd
QPPZa !2
2
!2
23 AA S'A2
+++=
7S'A12S !22
A +++= gd
QZ
7!S'B! !22
A
gd
QZ
+=
()*) 27 4 !7 ?) M==0'15m7 t> 8+Yc $
Q=0'03A! m3/s7 = 3A'! l/s7 :=1'I m
Bi 6.7:
Nhm:9 Trang$ 3
73532233222233
222
+++=++ tbg
Vp
g
VPhzZ
8/10/2019 Bai Tap Thuy Luc 4971
4/9
Bi Tp Nhm Mn: Thy Lc
2
1 10 0
2
h
&>
[ cho$
+
( ) ( )
( )
( )
0 0 ! 2
3
1
S0 1
20 $ 2 2.10
0' B2 0' B2.BA10 B025' 2
Q v ph l s
t C St m s
N m
= =
= = =
= = =
+ +Fng Gng$ L = 5m U M = 35mm+ 0 00'1 U 10 U 1c dmm h h h m = = =
"#nh$+& tO) mt ct 4o c> m.+ ;?) 0 !A0 U 1 10 U 0'A5t C St = = = = th- &=V
Bi gii:
. &h+ng t,-nh cnl) cho mt ct 11 4 22$2 2
1 1 2 21 1 2 2 1 2
2 2 tb
P v P vZ Z h
g g
+ + = + + + 17
;?)$
1 2 1 2 2
!U 0U 0U
QZ h Z v v
d= = = =
"> c9$3
1 !
. !. !.10
\ 1A2 2320. . .0' 035.2.10
v D Q
d
= = = = < l4 M]ng ch*y tPng @^1= ^2= 2.
2 2
1 2 2 !
A. . . .
2 . .tb c d
l v l Qh h h
d g d d g
= + = + = +
;?)$1
S!0'35
\= =
Nhm:9 Trang$ !
8/10/2019 Bai Tap Thuy Luc 4971
5/9
Bi Tp Nhm Mn: Thy Lc"h>y 4o 17 t> 8+Yc$
2
1 22 1 22 !
1 1
3 2 3 2
22 ! 2 !
1 1
A
. .
2.A.10 7 5 A.10 70' 35. . 1
.0'0357 .B'A1 0'035 .0'0357 .B'A1
tb
a ck
P P Qh h
d g
P P P
+ = + +
= = +
= 2'1 m ct MP7
B025' 2
2'1. 0'1B 7BA000
ckP at= =
!. Jh) t = A00C" 1St= U 0'A5=3
!
. ! !.103S!0 2320
.0' 035.10
e
v d QR
d
= = = = >
@ l4 ch*y ,G) ^1= ^2= 1.o \ nh_ n`n t,Ong thK) M]ng ch*y l4 ch*y ,G) th4nh t,n thy lc.
0'25 0'25
0' 31S! 0' 31S!0' 0!
3!S0e
R = = =
Nh+ Hy$2 2
22 2 ! 2 !
A A. . .a
P P Q l Qh
d g d d g
= +
2
22 !
A.
Q lh
d g d
= +
3 2
2 !
A10 7 51 1 0' 0!.
.0' 0357 .B' A1 0' 035
= +
0' S2dP
= m ct MP7
;?) 32 0' A5.BA10 A33A' 5 7N
m = =
0' S2.A33A' 5 0' 05 70' BA.105
dP at = =
BI:6-#.
Nhm:9 Trang$ 5
8/10/2019 Bai Tap Thuy Luc 4971
6/9
Bi Tp Nhm Mn: Thy Lc
1 2
2
0
1
0
;)at h+ng t,-nh Bcnl) cho cKc mt ct 11' 22 mt ch6n XX7.
21
2
22
22
2
11
11
22 +++=++ tb
dd
hg
vpz
g
vpz
",ong 89$ T1= T2= 0
1= 2= =A3'2
710.2
150.
10.50
23
3
==
S
Q
m/s7.
;- 8+Fng Gng c9 ch)[ M4) l?n n`n t> c9 thb _ > tn thDt cdc .
g
v
D
lhh dtb
2..2
21 ==
e Jh) t = 100C t,> )b 8f h-nh SA t,>ng 1I1B" thy lc 4 mKy thy lc7 t> c9$
B'0
710.373
1
2!
2
1
=
==
s
m
s
cm
7AA2BBA10.B'031 m
N==
y ,>$ 23201!1510.3
10.150.A3'2.\
!
3
1
8/10/2019 Bai Tap Thuy Luc 4971
7/9
Bi Tp Nhm Mn: Thy Lc
AB!'0
710.25'1725'1
2
2!
2
2
=
==
s
m
s
cm
7AII0BA10.AB!'0 32 mN==
y ,>$ 232033BS10.25'1
10.150.A3'2.\
!
3
2 >===
Dv
L4 M]ng ch*y ,G)$ 121 ===
o \2nh_ n`n t,Ong thK) M]ng ch*y l4 ch*y ,G) th4nh t,n thy lc.
0!1'0733BS
31S!'0
\
31S!'025'025'0
2
===
Nh+ Hy$ AI'55IA1'B.2A3'2
.10.150
10.5.0!1'02..
2
3
32
2121 =====
g
v
D
lhh
ppdtb
d m ct
MP.
21 ppp = = 55I'AI . AII0 = !' . 10SN/m27
e Jh) t = 300C t,> )b 8f t> c9$
AAB'0
710.5'075'0
3
2!
2
3
=
==
s
m
s
cm
7AI21BA10.AAB'033 m
N==
y ,>$ 2320A!B010.5'0
10.150.A3'2.\
!
3
3 >===
Dv
L4 M]ng ch*y ,G)$ 121 ===
o \3nh_ n`n t,Ong thK) M]ng ch*y l4 ch*y ,G) th4nh t,n thy lc.
033'0
7A!B0
31S!'0
\
31S!'025'025'0
2
===
Nh+ Hy$ !!BA1'B.2
A3'2.
10.150
10.5.033'0
2..
2
3
32
2121 =====
g
v
D
lhh
ppdtb
d
m ct MP.
21 ppp = = !! . AI21 = 3' . 10SN/m27
B4) !15$
Nhm:9 Trang$ I
8/10/2019 Bai Tap Thuy Luc 4971
8/9
Bi Tp Nhm Mn: Thy Lc
Cho$ & =IS0mmWg='A.10!N/m27to= 200C 2I3= T 0J = 0'2m ' B5'0=
()*)1."#nh l+ l+Yng khEng kh# kh) ct K c> ,+Y) Mng t,ong chn khEng kah=0'25m7 2/A00 mNr=
Chin mt ct 11' 22 nh+ h-nh j chin mt hng 8) > t,dc Ot' l4m mtch6n. "> c9 h+ng t,-nh Bcnl) tO) 2 mt ct 89 l4$
=++g
VPZ
2
2
11
11
21
2
22
22
2 +++ !h
g
VPZ
17
"> c9$ :1 = :2 =0121 ==
;1= 0Ww12= 0 8oOn M]ng ch*y ngn khEng c9 ch+?ng ngO) Ht.
17g
VPPa
2
2
22 +=
2PPh ack
=
cka h
PP=
2 27
"ha 27 4o 7 t> 8+Yc$g
Vh
PPck
a
2
2
22 +=
gVhck2
2
2= 37
"> c9 K sDt chn khEng tO) ct n+?c h*) ng K sDt khEng kh#.&ck= &kk kkkkrck hh = .
;?)$ ( )3!
>kk m/NA2'11
2B3.2I'2B.I50
10.A'B.IS0
\"
&===
( )m2'1SB!'11
A000.25'0
.hh
kk
,ckkk ==
=
Nhm:9 Trang$ A
1
1h
8/10/2019 Bai Tap Thuy Luc 4971
9/9
Bi Tp Nhm Mn: Thy Lc"ha 4o 37 t> 8+Yc$
7s/mS2'5I1I5.A1'B.2h.g.2 kk2 ===
7s/mA'1!
5'S2'5I.2'0.1!'3.
!
M.Q 3
2
2
2
ttkk ==
=
;?) ( smQ "kk /I1'1B5'0.A'1B5'0 3=== 2' ;?) Qkktt= 1'A m3/s7' "= 2I3 R 20 = 2530k ;4 hkk= 1S'2 m7 khEng kh# &kk= !05mmWg7 = 0'5!.105N/m27
;?) ( )35
kk m/N3'I2AI.253
10.5!'0.A1'B
\"
&.g.g ====
Ct K c> ,+Y l4$
hck,= hckkk. ( ) ( )mm15!m15!'0A0003'I
.2'1SB,
kk ===
Nhm:9 Trang$