Abstract:

Based on a series of numerical computations and model experiments on the lobed nozzle mixer-ejector infrared signature suppressor used in the helicopter gas turbine exhaust system, the comprehensive summary is made to reveal and analyze the internal aerodynamics of the infrared signature suppressor, the effects of ambient air pumping-mixing and heat shelter-insulation on decreasing the target infrared signature, and the infrared signature similarity between different scaled infrared signature suppressor models. Also some problems needed further investigation are presented.

Key words: infrared , signature , suppression,  , lobed , nozzle,  , mixer-ejector,  , helicopter , exhaust , system