Principle And Practice Of Hotwire Constant Temperature ...
Principle And Practice Of Hotwire Constant Temperature ...
Principle And Practice Of Hotwire Constant Temperature ...
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11 th Israeli Symposium on<br />
Jet Engines and Gas<br />
Turbines, October 2012<br />
Technion, Israel<br />
Sensitivity analysis:<br />
e' ρ' u'<br />
0<br />
=S<br />
ρ<br />
+S<br />
u<br />
+S<br />
T<br />
+S '<br />
0<br />
0<br />
E ρ U T<br />
Conventional Methodology<br />
T'<br />
<br />
In supersonic flow S =S u ;<br />
<br />
e'<br />
ρu'<br />
T'<br />
0<br />
=S<br />
ρ<br />
+ S<br />
T<br />
+S '<br />
0<br />
0<br />
E ρU T<br />
<br />
logE<br />
S(ρ,U,T<br />
ρ 0<br />
, ) =<br />
log <br />
logE<br />
S(ρ,U,T<br />
u 0, ) =<br />
logU<br />
logE<br />
S<br />
T<br />
(ρ,U,T<br />
0 0, )=<br />
logT<br />
S(ρ,U,T , ) =<br />
<br />
0<br />
logE<br />
<br />
U=const., T =const.,<br />
0<br />
0<br />
const.<br />
=const., T =const., const.<br />
0 =const., U=const., const.<br />
=const., U=const., T const.<br />
0<br />
Not True for<br />
Subsonic & Transonic<br />
• Parameterizing one parameter at a time while others remain constant<br />
Impractical Non-Physical (Purely Empirical) Not Reliable