def testAndersonTable(self): # Appendix A and B from Anderson2016
# For this case the pressure ratios of two tables must be multiplied. Accuracy unknown after multiplication
# Lets guess 1 digit loss is fine
gamma = 1.4
in_out = (
(0.1760e1, 0.8458e1, 0.4736e1, 3), # M = 2.05
(0.1395e2, 0.2247e3, 0.2140e2, 2) # M = 4.3
)
for AR, PR_exit, PR_shockwave, places in in_out:
res = IRT.exit_pressure_ratio_shockwave(exit_area_ratio=AR,
gamma=gamma)
self.assertAlmostEqual(res, PR_exit / PR_shockwave, places)
def testOne(self):
# Should return pressure ratio for M=1, as shockwave is infinitely weak
# Value taken from Anderson2006 Appendix A again
expected = 0.1893e1
res = IRT.exit_pressure_ratio_shockwave(exit_area_ratio=1, gamma=1.4)
self.assertAlmostEqual(res, expected, 3)