Numerical investigation of flow and heat transfer characteristics of a full-scale infrared suppression device with cylindrical funnels

Numerical investigation of fluid flow and heat transfer characteristics of a full-scale Infrared suppression (IRS) device for ocean liners is carried out in the present study. The main objective of the work is to reduce the temperature of the turbine exhaust by incorporating the IRS device, which can be effectively used in stealth technology for naval ships. In this study, the IRS device having multiple cylindrical funnels are used for conducting the computational experiment. The numerical solution of the Navier-Stokes equation along with the turbulence as well as the energy equation is solved using the algebraic multigrid solver of ANSYS Fluent 15.0. Many pertinent input parameters, like the inlet Reynolds number, fluid temperature, the number of funnels, and their sizes with overlapping or without it, have been varied in a practical range to study the mass suction into the IRS device. It is observed that the mass entrainment increases with an increase in the nozzle fluid temperature as well as its velocity. Visualization of temperature plume and flow field over the IRS device with multiple funnels has been picturized in this analysis. Furthermore, correlations for the prediction of mass entrainment rate as a function of pertinent input parameters have been developed, which can be used for academic and industrial purposes. •The present study captures a complete picture of flow and heat transfer characteristics over a full-scale IRS device.•The nozzle Reynolds number is varied between to , and the temperature is varied within 423 K to 723 K.•The parameters such as nozzle velocity, number of funnels, size of the funnel and overlapping has also been varied.•Visualization of temperature plume and flow field over the IRS device is reported pictorially.•A generalized correlation for mass entrainment is developed that can be used for academic and industrial applications.