Noise From Supersonic Coaxial Jets, Part 1: Mean Flow Predictions

New Method for Jet Noise Reduction in Turbofan Engines

“…The second inflection point, i2, defines the outer edge of the primary shear layer (inner edge of the secondary shear layer). Dahl and Morris, 22 in their mean flow model for coaxial jets, used basically the same criterion to distinguish the two shear layers. Thus, u s (x) = u[x, y i2 (x)].…”

Computation of Large-Scale Structure Jet Noise Sources with Weak Nonlinear Effects Using Linear Euler

“…In all cases, the jets were cold with the jet exit total temperature equal to the ambient temperature. The mean flow was computed using the parabolized, boundary-layer procedure of Dahl & Morris 13 with the addition that the radial velocity profile was computed from the mean continuity equation. This procedure generated mean flow profiles that smoothly transition from the initial region to the fully developed region allowing complete parameterization by the momentum thickness, θ, as required by the nonlinear analysis.…”

Modelling of a multiphase reacting turbulent jet: Application to supersonic carbon injection in siderurgic furnaces

“…The flow generated by a coaxial arrangement of streams has been extensively studied in the literature, both in the case of incompressible fluid (see Rehab et al, 1997;Balarac and Metais, 2005, among others) and in the case of compressible fluid (Dahal and Morris, 1997). The flow is controlled by the growth rate of the shear mixing layer at the interface between the inner and the outer jet.…”