The Effect of Reynolds Number on Mass Suction and Outlet Temperature in IRS Device

The precise calculation of thermo-physical properties of the IRS system is complicated due to the flow involving the hot turbine exhaust jet, ambient air intake, and the mixture of hot and cold ambient air. The present numerical computation considers a two-dimensional axisymmetric Infrared Suppression System (IRS). It consists of two conical funnels, one converging and the other one diverging, used one above the other. The device's mass suction and outlet temperature are calculated by changing different geometrical and operational parameters, such as the Reynolds number. For the current computation, the variation of mass entrainment ratio and the ratio of outlet temperature of the air to the surrounding air is plotted against varying Reynolds number and nozzle inlet temperature. Numerical simulations are carried out for the full-scale IRS device by applying a conservation equation of mass, momentum, and energy in the cylindrical computational domain surrounding the IRS device.