The instability of a liquid jet immersed in a coflowing compressible airstream has been investigated on the basis of a linear, inviscid stability analysis, assuming uniform velocity profiles within the liquid and gas. Both two‐dimensional and circular jets are investigated. Pronounced peaks in the temporal and spatial growth rates occur for values of the free‐stream Mach number close to unity. A change from convective to absolute instability also occurs in this transonic flow regime of the gas.

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