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c). 换热器出口至试验段入口：

t3 = 300C

p3 = 160bkg v3 = 0.0014166 m

V3 = = 1.528 m s

kgWv13 ρ3 = = 705.92 m3

v3 π4 2

d3 d3V3 5

Re3 = = 3.018 ×10

v3μ3 ?

0

3

μ3 = 89.36 ×10 Pa ? s

?6

热交换器 3?? ?=0.0? 10

? 1 + ?20000 ×f 3 = 0.0055+ 2.769× 1

6 10 ? ?? ?? 0.0015

1485 L V 3 ρ3 325 Pa ΔPf3 = f3 ? = 5927

2

?

试验段

d3 2

ΔPel3 = ρ3 g Δz3 = ?14530 Pa

ΔP 3 = 0

ρ3V3

ΔP 3 = 3K = 1483Pa

2

c

2

a

13:14:49 习题讲解 38

d). 试验段内：

t3 = 280.6C

ρ3 = 1

P3 =160b

mvkg3 3= 0.0013065

= 756.4 m V3 =

0

3 kg

μ3 = 97.37 ×10 Pa ? s

?6

= 1.409 m s 4

d3 3 5

Re3 = = 2.769 ×10

μ

v3

3

3?? ?

? ?=0.010

3 0.0055 ? 1+?20000×f4=+5554×10? ?? ??5 V 0.0015 ? ? 13 π143

v

2 3

.

d

L4 ρ4V

ΔPf4 = f4 = 14049Pa

d4 2

a

ΔPel4 = ρ4 g Δz4 = 747.332×9.8×1.2 = 8789Pa

? 1 1 ? W ΔPin = 0.72 ? 2 ?1751 ΔP 4 = G ( v1 ? v3 ) 2=Pa

2

4

热交换器 试验段 ? A4 A3 ? ρ

2

ΔPex = ?σex (1 ? σex ) G v = ?4446Pa

? = 13811Pa

13:14:49 习题讲解 39