CHAPTER 3: PHYSICAL EFFECT OF VITIATION ON SCRAMJET ...
CHAPTER 3: PHYSICAL EFFECT OF VITIATION ON SCRAMJET ...
CHAPTER 3: PHYSICAL EFFECT OF VITIATION ON SCRAMJET ...
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<strong>PHYSICAL</strong> <strong>EFFECT</strong> <strong>OF</strong> <strong>VITIATI<strong>ON</strong></strong> <strong>ON</strong> <strong>SCRAMJET</strong> DESIGN<br />
3,50<br />
3,00<br />
2,50<br />
2,00<br />
1,50<br />
pure<br />
vitiated<br />
Mach<br />
Mach-cas4<br />
Mach-cas6<br />
1,00<br />
0,00 0,50 1,00 1,50 2,00 2,50<br />
Figure 12: Computed effect of vitiation on Mach number<br />
The computed effect is different after each step, probably because the 1D analysis is not appropriate in<br />
such a sudden expansion of the flow.<br />
2,00E+05<br />
1,80E+05<br />
1,60E+05<br />
1,40E+05<br />
1,20E+05<br />
1,00E+05<br />
8,00E+04<br />
6,00E+04<br />
4,00E+04<br />
2,00E+04<br />
0,00E+00<br />
Static Pressures (Pa)<br />
pure<br />
vitiated<br />
+ 9%<br />
Static_Pressures-cas4<br />
Static_Pressures-cas6<br />
vitiated<br />
0,00 0,50 1,00 1,50 2,00 2,50<br />
Figure 13: Computed effect of vitiation on pressure (Pa)<br />
The opposite effect on Mach number and static pressure is visible in figures 12-13. The effect of<br />
vitiation on the computed heat flux (see figure 14) is note worthy: vitiation of the flow, within the assumptions<br />
made, leads to an increase of heat flux (about 5%). In this case, the check-out of a thermal protection or a<br />
cooling circuit should lead to a conservative design.<br />
3 - 8 RTO-TR-AVT-007-V2<br />
pure
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