Investigation on Influence of Transverse Jet Incidence Angle on Radiation of Plume

To study the effects of different incidence angles on the flow mixing and infrared suppression characteristics of the jet, the transverse jets were introduced on the basis of the axisymmetric convergent nozzle model, and the effects of five different transverse jets on the flow mixing and infrared suppression characteristics of the jet were studied. The flowfield and temperature field are obtained by solving the N-S (Navier-Stokes equation is the momentum conservation equation of viscous fluid) equation with the finite volume method. The infrared radiation intensity of the jet is obtained by using Reverse Monte Carlo method and narrowband model. The results showed that the transverse jet induces pair vortex structures that gradually increase in the direction of the flow. In addition, the vorticity increases with the increase of jet incidence angle, and the mixing ability of the cold flow and the high-temperature core region becomes stronger. The length of the high-temperature core region decreases continuously with the increase of the transverse jet incidence angle [Formula: see text] and reaches a minimum when [Formula: see text]. Compared to the condition without the transverse jet, the length of the high-temperature core region is shortened by 38.9%. The intensity of radiation decreases with the increase of the transverse jet incidence angle. When the incidence angle [Formula: see text] is 150 deg, the radiation intensity of the plume decreases by 34.9%.