ENHANCING THE EFFICACY OF THE INFRARED RADIATION SYSTEM WITH THE USE OF A NOZZLE AND ITS CONSTRAINTS

An infrared suppression system (IRS) is used in modern vessels to mitigate the heat of the engine's exhaust. A converging-diverging funnel system is examined, with a nozzle positioned just before the exhaust pipe to enhance the device's efficiency. The thermo-fluid study of the proposed system involves resolving transport equations related to continuity, momentum, energy, and turbulence via the finite volume solver in ANSYS FLUENT. The research contrasts the IRS device in both nozzle and non-nozzle conditions. The nozzle enhances the device's mass entrainment, ultimately reducing the exit temperature. The maximum velocity and back pressure impose limitations on the nozzle's application to meet incompressibility and back pressure standards. The influence of the nozzle diameter ratio on output parameters, such as mass entrainment and outlet temperature, is examined. The characteristics are analyzed at various exhaust inlets, ranging from 7.5 kg/s to 31 kg/s. The current study examines three distinct diameter ratios: 0.625, 0.5, and 0.375. A lower diameter ratio exhibits more mass entrainment than a higher diameter ratio. The outlet temperature decreases as the diameter ratio increases. Nonetheless, the maximum velocity and back pressure limit the application of the nozzle. The nozzle, with diameter ratios of 0.625 and 0.5, meets the requirements for incompressibility and back pressure for all studied mass inlets. Nonetheless, a nozzle with a 0.375 diameter ratio can accommodate these circumstances only up to an input mass of 15 kg/s.