LIU Jian-xin, LUO Ji-sheng. Effect of Disturbances at Inlet on Hypersonic Boundary Layer Transition on a Blunt Cone at Small Angle of Attack[J]. Applied Mathematics and Mechanics, 2010, 31(5): 505-515. doi: 10.3879/j.issn.1000-0887.2010.05.001
Citation: LIU Jian-xin, LUO Ji-sheng. Effect of Disturbances at Inlet on Hypersonic Boundary Layer Transition on a Blunt Cone at Small Angle of Attack[J]. Applied Mathematics and Mechanics, 2010, 31(5): 505-515. doi: 10.3879/j.issn.1000-0887.2010.05.001

Effect of Disturbances at Inlet on Hypersonic Boundary Layer Transition on a Blunt Cone at Small Angle of Attack

doi: 10.3879/j.issn.1000-0887.2010.05.001
  • Received Date: 2009-11-16
  • Rev Recd Date: 2010-03-25
  • Publish Date: 2010-05-15
  • Toinvestigate the effect of different disturbances in the up stream, we present numerical smiulation of transition for a hypersonic boundary layer on a 5-degree half-angle bluntcone in a freestream with Math number 6 at 1-degree angle of attack. Evolution of small disturbances is simulated to compare with linear stability theory(LST), indicating that LST can provide a good prediction on the growth rate of the disturbance. The effect of difference disturbances on transition was inves tigated. Transition on set distributions along the azmiuthal direction are obtained with two groups of disturbances of different frequencies. It shows that transition on set is relevant to the frequencies and amplitudes of the disturbances at the in let, and is decided by the amplitudes of themost unstable wave at the in let. According to the characters of the environmental disturbances in most wind tunnels, we explain why transition occurs leeside-forward and windside-aftovera circular coneatanangle of attack are explained. Moreover, the indentation phenom enon in transition curve on the leeward is also unpuzzled.
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