Mach number dependence of flow instability around a spiked body

A forward-facing aerospike have been identified as a passive flow control device for enhancing the aerodynamic efficiency and reducing heat transfer in high-speed flows. In addition, it has reported that presence of spike brings unsteadiness form oscillation pulsation to structure. Previous researchers investigated aerothermodynamic coefficients, together with offering detailed explanation physics associated unsteadiness, their dependence on spike's geometric characteristics (spike nose, length-to-fore-body diameter ratio, L/D). This work focuses ascertaining role speeds (free-stream Mach number), energy content, governing around spiked body, which is yet be established. Numerical investigation carried out using axisymmetric Navier-Stokes laminar solver number range 2.0 7.0. round-tip flat-face cylindrical after-body simulated length ratio L/D = 2.0, fore-body 0.1. The analyzed drag pressure coefficients variation at different numbers. It was found field blunt nose behaves mode lower numbers 2, 3 transition oscillatory higher 5, 6 7, while remain almost stable 4. limit Strouhal Number characterizing modes various 2 flat observed 0.2, however may very well depend other parameters after-body.