, .
, .
- , , . .
, . .
.
(77) , , ( , ).
u1/u2=w2/w1= const. (77)
.
= ,(4-12)
:
+ = const. (4-13)
(4-12) (4-13) , . , (4-13) : = const, = . (4-14)
, : , , , . .
4. ? .
, ( ) , . () .
(. . 3.) . . , .
: . , + .
. .
, , , . ( ) . . , Re ( ), v , D:
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Re = v D/ . (84) , , . , Re = 2300, Re = 2000.