Jet Noise Final Ppt
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23 A?B? Jet Noise is the most dominant source of Noise
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5 NPR
Jet }haracteristics
Distance of Mic͛s
Diameter of Nozzle
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( 6
= ª ! " # $$% &' ( # ) ! )
&* + , " ) &-.
0
&/-. )
ª &* # ! " + 1 " &-. ! ) &* +( ! # )+ª/!
2 3 1 4 ) # # +(
)
23+ 5 # 2 3 6 ! 6 ++&* ª # 2ª 738& )2 % 3 ª 7
1 ! = # ! 9 # # / )/ ! / " 4 ) :
; # !
- / / # 9 6 ) ) # # )
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ª =
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= =)
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= 9
&
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$+?
>$+? ;@+$
;+
; @ & ,
(
(
23 A?B? Jet Noise is the most dominant source of Noise
9 # 4 9 # # ..
ª ª ) /.. #
)) C " ª ) 7 ! 5)
) ª ) )" ! ++. ! # ) ! ! )) + ! #
C
) + 6 / / ! 4 ª 7 )# + = # D E 6
++( # )) ! / 2 F3
4
ªetting the pressure ratios inside the Lab View
GHC @% , ª # , "
@-.A -.
5 ) &;A @ (
A@ I JK
.
&4
" ( ))
! !
) 9 ( ))
! ! (
" (!) # / 9 + # !) ( " 4 ) + (9 + ) 9 4
) + , 9 )
) "
7
( . ) +( + -) !)$ " ! $$-. +
..
9 4
) . + ) ! !
nalysis of Data in time domain
+
1 " +- ! " ), , ( 2,,(3+
,,((
, " ( " !
( 9 !
)A + , 9 ) #) + ( +
1
4 ,
4 9 ) ) ! # ( = # ( = # #
1 4 , 4 9 / 6
9 + ( ! 6 " /!
ªcreech tones. ( broadband shock associated noise+
( 4) 1 / !
+ ( 6) # ) A 9 !+ ( 4)
) @J ) 9 ! +
( # ) ) 9 !+
= ) 4 ) ! # ! #!
+ (! #!
! # ) ! # ! #+
}haracteristics of the Broad Band shock associated noise
(# 6 ) 6 +
/ + ( "
) 6 )!
+ ( "
) 6 )! ) + ( A! 6 ! ) +
) ª ( ! ! ) ) ) % ! # 6
!
)#
+ :) # )! #! ! # 26A 63+ 16 ) ) 6/ ! #) # +
ª 1 fundamental
+ ( ) 6+
.. )) 4 ! # 9 !+ ! # ) ! 4 ) ! ) ! + ( ! # #) " )) ! " A 6
9 + ( ) +, 6A / + ( 6 ! # ) 9 + : ) .. )/ 4 9 /! ) ! ! #+ 1 ! / 6 +
5 NPR
Jet }haracteristics
Distance of Mic͛s
Diameter of Nozzle
$+
1
4
J+
+J
&
&+J
# 4
D
D
$
$+
# 4
D
D
@
@+
: 4
D
D
L 58$+
4 M
2 <3
¤here are no screech tones or broadband shock noise as it is an 2 <3 ideally expanded case
ª 7#
(ª 7 ) ) ) ) ! # ) ) + ) ª 7
+
&L 58&+J# 4 9 M
&2 <3
( 6
+( " S Hz+ ª " )(C S Hz+ ( ) +( ) 6 2ª3+ ) ( ª
&2 <3
ª 7#
$L 58$# 4 9 M
$2 <3
ª # + ( " # ) S Hz+ ( " )(C 44 Hz. $2 <3
ª 7#
ª 7
) 58&+J+
4 58$+
@L 58@ 4 9 M
@2 <3
( # ) 4
+ @2 <3
ª 7#
(ª 7
) # )
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( 6
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