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. We investigate the elliptical instability of a strongly asymmetric vortex pair in a stratified fluid, generated by the acceleration and deceleration of the rotation of a single flap. The dominant parameter is the Froude number, Fr = U/(NR) , based on the maximum azimuthal velocity, U , and corresponding radius, R , of the strongest vortex, i.e. the principal vortex, and buoyancy frequency N . For Fr >1, both vortices are elliptically unstable while the instability is suppressed for Fr

An experimental investigation on elliptical instability of a strongly asymmetric vortex pair in a stable density stratification