The phenomenological boundary-layer equations describing the flowfield in a turbulent jet diffusion flame with swirl are solved in the von Mises plane. The expressions found are compared with experimental results for three jet flames with different degrees of swirl using semiempirical values of turbulent exchange coefficients in the flame. The combined theoretical and experimental study indicates that an increase of the swirling motion in a flame leads to an increase of the flame width and mass entrainment and to a corresponding decrease of the flame length. These effects are associated with changes of the values of the turbulent eddy viscosity and Prandtl number caused by varying the swirl intensity in the flame. Nomenclature 61/2 = flame width defined in the text, Eq. (33) c = empirical constant defined by Eq. (20) Gx =