Bandwidth Effects on Mack-Mode Instability Conference Paper uri icon

abstract

  • Hypersonic Mack-mode instability on the Purdue compression cone is investigated by means of the nonlinear parabolized stability equations method. To date, most nonlinear stability analyses have considered a single frequency primary mode, however experimental observations find a finite-bandwidth of disturbances. To determine the affects of disturbance bandwidth on Mack-mode stability, the nonlinear evolution of different numbers of primary Mack-modes is considered. It is found that disturbance bandwidth has a negative feedback affect, suppressing the growth of the primary Mack-modes. A novel methodology is introduced to isolate nonlinear saturation affects from other nonlinear mechanisms. In addition to nonlinear saturation, a separate mechanism, nonlinear detuning, is found to have a significant influence on Mach-mode growth. These results will impact the development of laminar flow control schemes at hypersonic speeds.

author list (cited authors)

  • Kuehl, J., Reed, H. L., Kocian, T., & Oliviero, N.

citation count

  • 7

publication date

  • June 2014