Numerical modelling of jets exiting from the ASME and conical nozzles

摘要: Two isothermal round jets at a Mach number of 0.9 and diameter-based Reynolds 2 × 10 5 have been computed by compressible large-eddy simulation using highorder finite differences on grid 3.1 billion points. At the exit pipe nozzle in which trip forcing is applied, they are characterized flow parameters, including momentum thickness shape factor boundary layer, momentum-thicknessbased number, peak turbulence intensity, roughly match those found experiments two nozzles referred to as ASME conical nozzles. The nozzle-exit layer therefore highly disturbed laminar state first jet, turbulent second. conditions, shear-layer jet fields, far-field noise provided highly-resolved simulations described compared. with ASME-like initial conditions develops little more rapidly slightly higher levels than other. Overall, however, results obtained for very similar, good agreement measurements available jets. This particular true farfield pressure spectra. As has reported yield nozzle, this suggests that present do not adequately reflect and/or link between simple was thought.