Effect of Frozen Turbulence Assumption on the Local Blades Vibration on the Choke Flutter Instability in Transonic UHBR Fan

The choke flutter can lead to the failure of fan or compressor blade in turbojet engines. Choke appears when a strong shock-wave chokes channel. In UHBR fan, at part speed regimes and low negative incidence. this paper, instability is analyzed based on resolution time-Linearised Reynolds-Averaged Navier-Stokes 2D extraction an Ultra High Bypass Ratio (UHBR) named ECL5v1. An analytical motion rotation airfoil around its leading edge, without deformation surface imposed typical operating condition. For selected Inter Blade Phase Angle (90\(^\circ \)) reduced frequency (0.15), happens. vibration decomposed large set subsection determine main local sources. This paper aims analyze effect turbulence modelling position sources work exchange along blade. Two cases are considered, with frozen assumption linearization model. results locate same position, direction but modulation magnitude. Amplification restriction magnitude seems be linked steady flow phenomena both excitation source receptor.