《工程流体力学》习题答案

40p040p0

..第章流及主物性º时º时

1000kg/3水98003水

水水

0.830.831000/水0.839800m3水

º

/cm

kg/

gcm

/

12348/

9

p

()

p

V

Vp

0.011.96

7

19.6MPa

3和1000

p

10

5

Pa

1p

4

8

1个ººdV

dTdpV0V

p

0

dV

.下可编辑.

p..p即

VdpT(V000040.00062020014000

4

200L2.57L2.4LM

2002.41000

kgVtdVt

t

20Vp

p

114000

110PmPa10

PaP

3.10.91000

m

2

/

水

，，

du1N/m

，L.下可编辑.

..F

du

11.96

2

8.55N.下可编辑.

..

第章流静学O2p（10+0.3Oa2p2pmHa

A＝225.5cmHO＝0.2255at＝2.2099×1042pp＝120099Paa形

ccl

d

ccl

8

phpp44

题4

UO.下可编辑.

Hg12HgHg12Hg120120O（

UUH为

1管形管Δh两以pHg0Hg1pH20HHHH1

应p

pph

hHg

13.6

0.68.下可编辑.

..

形两形HpHhpBBA水HgBA

水

HA

B

Hg

BA

水

Hg

980013.69800at形hppphhA油A油B

ppA

油

B

A

pp0.78AHg油水水0.7836045228.960.46atp－pp水Cp水

水油

hD油＝

水

125.下可编辑.

..

24

p0n

4Vp0t2

44.7525020.01

23圈h＝

h3zz1zx2

ag

＝＝H2

22＝得＝p＝(g+a)ρH2

p＝(a)2

p＝(a).下可编辑.

zzrr4柱22zzrr4柱22

..p＝(a)2p+a)＝（9.8－15的hn。h

2r2g

V抛

2g

2

g

4

抛

1

R4

1

4gR

3.14150

2.97rs178.34r

抛

RH/4

2

5003.14

2

r/sr/min

h2

H50022附明抛物的积同同圆体积一

V抛

R

2

g

4抛

dz00

g

0

2

2g

r

dr

0

r3dr

r4

r

020

z柱000

2

r02g

4

H

c

水

H122

3

16537.5.下可编辑.

d3Dcd3Dc

..f11576.25Nd

和A

a

d2

,

b

22

d

a34

bA

ab3.14

0.62

P98000.416660y)

HHmy0.4c

2166600.00318

N

c

水

yc

2

3.142.540.72

2

51071.5

c

0.274ymDc3

.下可编辑.

..

V

2H4

H

410002油

0.0898009800N/

2

为为BH

cDch

Pp980035281c1c1P98002c2

0.03c1Ah0.70.6h0.7c11

0.60.4

0.042Ah0.60.43h0.2+12

F＝压力体

2

41029.3N.下可编辑.

24AA油压力J24AA油压力Jc断V0.7298000.7298007.152.21100756.321N4

pc

油

H9800ce

9.63yAcc

md的d，

浮

P

P浮浮

o

V

排

P＝

o

2.下可编辑.

2dmgH12d2dmgH12d上04

14

4

22

d4

H

421

22

d

dz121

49.80.120.75220.02220.15625mh压体加只V

柱

↓)V

↑)产的上力P球

上P＝上

6

－水水

24

1

向的为阀重GG

6

球时，阀可动相为界态mHo

＝G浮

V＝

h.下可编辑.

..根G浮L10000木

木x

0.20.25

2

10.4.下可编辑.

yui2y2y,2xyxy..yui2y2y,2xyxy第章流运学动学础

uxy2iy3jxyk3

uxyx

2

,

1uy3

3

,uzaa

1xx23xyxy433132xy3y333116zz2yxyxy5.3333B

j

u

B

u

B2y

dxdy

ydyx2y2Cx

10000.2

/，

M

2d

4M/36003.141000

0.166.下可编辑.

吸22g2..吸22g2

Q

3.140.154

2

0.0124m/sV排

VA吸吸吸A排排

V0.71.575m/s毫pO

O

022Vgs

6.26

0.012

m/B=3米及

V2H01V2gH9.87.67/s21

4Q2

/7.67

68mm

Vg

V2

KPa

2g

2g

3

Pa

U

g

.下可编辑.

Z

油..油

pA

2g

Hg

Z

7.03m/s

pp的A经中米AB

油

B油

BwA油

m

22M0.915.8256kg/

g油3.1420.89.80.8

0.4

t/57/h.下可编辑.

1244..1244d，管列V21122ggAL/s0.03m/1223.14A0.020096m44

23.142A0.001256m4

212

0.03m/s0.02009610.03m/0.0012562

V22

V22g2.4980000.99800

1.493223.89

20626.37Paat42

41

24

2g29.8

0.89800

/s21

3/4

Q23.144

mHi，

H.下可编辑.

V2

h)12

21222g21222g9.8V2h)0.6)1.4m125.24msQV5.2422

4

4.112

m

3

/

i1

w101

hi20.1L2

V

dd

21

2

5.24m/2

0.09<d<d

泵

N轴

泵

0.972KW+h＝Q泵

泵

980030

m3/V

423.142

3.47/s

g

0.2

3.470.227580.45PaKPa.下可编辑.

119.8

QA2

204

m3/2+h2229.8＝1.57泵

652.52＝轴

泵泵

652.520.8

2g

1

/3

390

pV2192g

2g

202g

22390360390KPa

1o

H40

2o

w1H21

40

0.8

4546.25.下可编辑.

w吸w吸N

泵

QH0.89800

46.25WN

轴

N泵0.8

2518.06N电

N轴0.9

2797.84N7.2泵轴泵

泵VHQ

1V

32

203.840210.9429iV10.9429ims21.69210.07065V3/s2p0w吸22p2gg

19071.6Pa90A

m

Q0.1VA

1.4154/spat5Pap5PaAR1

A

QV2.18541

5

0.070650.81000.下可编辑.

9.8212..9.8212

2

Q2

R

2.06782

5

0.070651.4154

x

2

2y

15553.083

2

2

arctg

yx

43.43

D

p

0.196254

2

0.2544

2

0.049

20.10.51m2.04m/pat1.765

5

Pa

A

VABg1.764A

0.512

178350.75PapA178350.750.1962535001.335AAApA50.049BBB

PPcos30623xPRNByy

x

2

2y

31569.38NDA22

0.0124

/1m/s.下可编辑.

w2g221w2g2212V21220.8p

..PaPpA11

3.140.054

2

411.1045N

1

(20NpQAA2Q4V2.3/A1V21.02mDp22122

Q2p122

49.84

2.32

p11221ApA112

3.143.1442.34N

QA

3.140.124

0.155433/.下可编辑.

A1221Vcos19.8N

.下可编辑.

m水m423..m水m423第章流阻和头失

6.76.7

m

3

/sD100mm0.1

VD

6.70.134m/sD1MA0.8510003.140.1Kgs41000

3.22t/

45Pac

2000Dm

Recm

0.91000

0.1VA

A

0.8810001.660.13.142000

0.0093Pa9.3

f,Dl,

作T-2TT]

1

lpDDDp

lpD2Dp

413

l2RRD

.下可编辑.

43..43lfl

l

的]

xxyz

y

z

2

lDD

2D

llll2,,ALD

C

Dl,,L

TA

声ρ压试雷量分方求C

Kp

，c

p2

k

p

n

mVn

VDmm

m

Vm

Vn

mDm

0.96910000.1550

V.下可编辑.

2llmyzyyyyyyyzxyzy..2llmyzyyyyyyyzxyzynmnlml2=FrFrmmgLgLg1V1.12m/sm20

0

力

1方

1

xx

x

x

xxY

y

x

1

zz

zz

0

gx

x

x

xx

.下可编辑.

gx

y2..y2

01

g

2

u012

时

C

g

22

u

y22y2

2

2m/s

u

4

R24m/2m/R0.2r0.1414m2232圆32L

4a

32a42La

a。

M

3/36001000

m/

Q4Q423.14

m/s.下可编辑.

1rrr21rrr2Vd0.87330.3Re251

..，层流h

f

LV64L2d2Red11

2

0.87330.31.5

1746.62000，层流h

f2

L264L2dgRe2hfhf

f

hh

f2f

Re1Re

urum

rm

1n

r

1n

mA

m

r

rdr

r

n

r

v

nR

1n

x

n11rdr01R

1n

0

0

rR

1

1n

dr101

rR

2

1n

0

R211nnQ

m

R0

r

1

rdr

m

RQQVA11

V

.下可编辑.

fff..fff

V

Q4A23.142

/s2.830.15

，水光滑区0.31640.0224ReL220.1529.8f

h0.85f

hhf

1032m0.1529.8

V2120g2g

0.89800

Pa

1

p1＝

16.69800

4

m

hf

Vdg

V

hf

0.250.0320000

/sVdRe

0.25

10462.123

4

0.03

Q

d4

2

10.254

2

1.26

3

/.下可编辑.

ff..ff

Qth

5500241000

m3/m

/Q4Q0.0776323.14

1.063mVdRe

1.063

220.15d30559.77

163211.16193000Re

59.77

4

z

p

2

＝z

p

2

fh

f

0.82

4

m22

183.53661.06350000

.下可编辑.

当泵轴..当泵轴

Q/h

1081000/0.75

0.04m

/Q4Q40.0423.14

2

m/s1.2740.2Re0.3164

63694.3水力光滑区hf

LV2020.165d2ghj

20.0220.02m0.022

另：j

LV1.27420.0223md2g2hhwfjp2055goo0.1980004PamH5p56oopH5699.86moNN＝KW泵.下可编辑.

ff..ff第章压管的力算的，

Qth

1000/1000

/s0.063m

3

/Q4Q0.0632

2

m1.220.2570.03074Re

，水力光区f

L1.222453.56mD20.257i

L

0.0091pz112

f

98000453.56

492.564.25MPa43.367at）

Qt/h

1000/0.9

m3/s0.0278m/Q4Q0.02782

/s1.090.20.42

2000，层流20.22d0.2

Re

59.77

72529，水力光滑区Re0.3164.下可编辑.

212f2..212f2

f

LV223.622

f

LV20.03926g0.2

23.536管

Lsm3/1V

Q

0.25

1.02ms25Ls0.0252

3

/sV

Q

0.0253.14

0.8/sh

f

L1000210.025d2g9.81L5000.82h22.1mdg9.82Hf1f，及.下可编辑.

22Q211L220.0294.41f223.1422Q211L220.0294.41f223.142

f1

f

f3

h

LQ12

L

Q2

L3

Q2

1000Q29000.02510.024240.30.3

3000.02520.250.25

4256001

8888.9Q

22

22

16568.9Q

22即Q1

2

）

＝Q0.112

h

10000.04462m0.253.1424