Документ взят из кэша поисковой машины. Адрес оригинального документа : http://nuclphys.sinp.msu.ru/school/s08/s08_28.pdf Дата изменения: Tue Nov 18 10:31:02 2008 Дата индексирования: Tue Oct 2 00:31:01 2012 Кодировка:

CO2 ­ -
.., ..
E-mail: : Zavalov_Yuri@yahoo.com The effect of isobaric enhancement of temperature fluctuation amplitude under volumenonuniform heat generation in the turbulent flow of CO2 laser active medium has been investigated for pulse-periodic mode of energy input. As a result the amplitude of gas density pulsations is enhanced with an increase of both specific pump power and pump pulse duration in the discharge. The experimental values of the energy input threshold were been measured and compared with the calculation results.

1. , - . c ­ 2 -. , - . +/-15% . 1-100% . , , «» . 2. [1]. - , : . . .


.1-2 l .-. () - Y(l), :
n Y (l ) = 2 l n -1
2 -2 / 3

= 2

2 GD

- GD= KGD/norm 10-5 ; n1­ ; norm ­ . .1.
0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 0 0.5 1 1.5 2 2-202-402-702-991 1 1 1

l

2

-2 / 3

,

(0.1)

20 18 16 14 12 10 8 6 4 2 0 0 0.5 1

2-2 2-4 2-7 2-9

0-1 0-1 0-1 9-1

1.5

2

.1 , . 2 , 20%, 40%, 70%, 99%.

.2 Y(l)= , . , .1.

3. :
T 1 + vT = T + Q (T , ) . t Cp

(0.2)

, , , . , . :
% T 1 % 1 % % + vT0 + v0T = - Q (T , ) T+ 2 t Cp T Cp



Q + Q T

T , % T p

(0.3)

[2]:
% T T0 % 1 v ln Q - ln Q + C p 0v0T0 v0 1+ Ql ln T ln p

.

(0.4)


,
X

T - , T
X

(0.4) ,
% % T Ql v - - . 0 T Cp0v0T v0

(0.5)

, E (k ) C2 / 3k -5 / 3 , (0.6) -11/3 % % T : l v : l 4 / 3 : ~k-5/3 ~k ET (k ) ~ T 22 / 3k -11/ 3 , (0.7) - ~k-3 % ~ k- 5 , T = T t p / l 2 - .3. % ( ), t p = l / v - l. (Pr~1) . l < l 0 : 3 E (k ) : k -3 [ ]: ET (k ) ~ k -5 . (0.8) .3 . [4], , : : E (k ) ~ k -13 / 3 , : E (k ) ~ k -7 . ET (k ) ~ k -11/ 3 [5] « », . (0.5) - , - () , , ( ) [6]. ~ v v0 (0.5) , , :
X X X X

Ql

M 2Cp0v0T l

=

0v03 . -1 l

(0.9)


:
n - M 2K
GD

% Ql l v , 3 v0 v0

(0.10)

(0.10) :
X X

nR -M 2 G D

% Q vR , Qt hr es v0

Qt

hr es

3 = v0

0 , R

(0.11)

- , (0.5) . Q > Qt hr es :
X X

2 n2 = na 2 + ni 2 = na 2 1 + ( Q Qt hr es ) , (0.12) na

, ni - (0.11) .
X X

Wt

h r es

= Qt

hr es

/(1 - ) =

3 v0 0 . 1- R

(0.13)
X X

(0.11) . t d L / v W[/3] E[/]: E =
W



, E1 =

t
d

W1L , v

g =

: E = g E1 . , [7],

W1 Wt hr es . g, , , , , :
Et
hr es

=

3 v0

t hr es

R

.

(0.14)

3 W1 =30 / , E1 =1100 /. , .1, 20 40%. 3 ep Wt hxeser i m =6...12 / . r 120 /, R=0.9 , CO2:N2:He= 1:4:16 120 0 =36 /3. (0.13)
X X


ep Wt hxeser i m =7 /3. , r .

4. c ­ 2 -. . , . .. , () , , ( ). .. - , . 06-02-16404-.
1. Panchenko V.Ya., Zavalov Yu.N., Galushkin M.G., Grishaev R.V., Golubev V.S., Dubrov V.D. The Development of Turbulence in the Active Medium of a Fast-Flow Gas-Discharge Laser // Laser Physics, vol. 16, 1, 2006 2. Galushkin M.G., Golubev V.S., Zavalov Yu.N., et al. Turbulent flow structure of FAF CO2 laser active medium at nonuniform temperature and heat generation \\ In: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; Ed.: Jarmila Kodymova; Proceed. of SPIE vol. 5777, p. 469-478, (2005) 3. ., E.M.. (10 .), .VI. , M.: , 1986. 4. KЭyel B., Gruber S. Experimental turbulence spectra in neutral and ion components of a weakly ionized gas, The Physics of Fluids, v.16, 1842-1847, 1973. 5. .., .., .., .., , . . , 44, 7, 562-576, 2001 6. .. : . , II., ... -, , 1999. (ISBN 5-88151-193-X) 7. Galushkin M.G., Golubev V.S., Zavalov Yu.N., Dubrov V.D. 2005. Turbulent flow structure of FAF CO2 laser active medium at nonuniform temperature and heat generation \\ In: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; Ed.: Jarmila Kodymova; Proceed. of SPIE vol. 5777, p. 469-478