Reentry Air Data System for a Sub-orbital Spacecraft Based on X-34 ...
Reentry Air Data System for a Sub-orbital Spacecraft Based on X-34 ...
Reentry Air Data System for a Sub-orbital Spacecraft Based on X-34 ...
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2007 USU Industry Day<br />
Real Gas Effects<br />
• An “averaged” value <str<strong>on</strong>g>for</str<strong>on</strong>g> γ across the shockwave is<br />
calculated using Eckert’s empirical reference temperature<br />
Tref = T∞ + 1<br />
2 Tawall − T ( ∞)+<br />
0.22( T0 2 − T ) ∞<br />
where Tawal l = T ⎡ 3<br />
∞ 1 + Pr ⎣<br />
⎢<br />
γ − 1<br />
2 M 2<br />
∞<br />
⎤<br />
⎡<br />
⎦<br />
⎥ and T02 = T∞ 1 +<br />
⎣<br />
⎢<br />
P r is the Prandtl number <str<strong>on</strong>g>for</str<strong>on</strong>g> air μC p /κ<br />
γ − 1<br />
2 M 2<br />
∞<br />
• These equati<strong>on</strong>s are solved iteratively, with the gas<br />
properties coming from real gas tables<br />
⎤<br />
⎦<br />
⎥<br />
16
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