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Basics of Fluid Mechanics, 2014a

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12.2. OBLIQUE SHOCK 505<br />

Table -12.1. Maximum values <strong>of</strong> oblique shock (continue) k=1.4<br />

M x M y δ max θ max<br />

1.9000 0.92224 21.1675 64.7532<br />

2.0000 0.92478 22.9735 64.6465<br />

2.2000 0.93083 26.1028 64.6074<br />

2.4000 0.93747 28.6814 64.6934<br />

2.6000 0.94387 30.8137 64.8443<br />

2.8000 0.94925 32.5875 65.0399<br />

3.0000 0.95435 34.0734 65.2309<br />

3.2000 0.95897 35.3275 65.4144<br />

3.4000 0.96335 36.3934 65.5787<br />

3.6000 0.96630 37.3059 65.7593<br />

3.8000 0.96942 38.0922 65.9087<br />

4.0000 0.97214 38.7739 66.0464<br />

5.0000 0.98183 41.1177 66.5671<br />

6.0000 0.98714 42.4398 66.9020<br />

7.0000 0.99047 43.2546 67.1196<br />

8.0000 0.99337 43.7908 67.2503<br />

9.0000 0.99440 44.1619 67.3673<br />

10.0000 0.99559 44.4290 67.4419<br />

It must be noted that the calculations are for the perfect gas model. In some cases,<br />

this assumption might not be sufficient and different analysis is needed. Henderson<br />

and Menik<strong>of</strong>f 15 suggested a procedure to calculate the maximum deflection angle for<br />

arbitrary equation <strong>of</strong> state 16 .<br />

When the mathematical quantity D becomes positive, for large deflection angle,<br />

there isn’t a physical solution to an oblique shock. Since the flow “sees” the obstacle,<br />

the only possible reaction is by a normal shock which occurs at some distance from the<br />

15 Henderson and Menik<strong>of</strong>f ”Triple Shock Entropy Theorem” Journal <strong>of</strong> <strong>Fluid</strong> <strong>Mechanics</strong> 366 (1998)<br />

pp. 179–210.<br />

16 The effect <strong>of</strong> the equation <strong>of</strong> state on the maximum and other parameters at this state is unknown<br />

at this moment and there are more works underway.

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