Influence of the shutter opening area in the chimney trunk on the infrared stealth performance of the power exhaust device

The role of the ship exhaust infrared suppression system is to control the infrared radiation of the ship exhaust system by reducing the temperature of the ship's chimney wall and exhaust smoke, thereby reducing the probability of the ship being detected by the infrared system. This paper studies the part of the chimney with shutters installed, and uses the fluid calculation software FLUENT to carry out numerical calculations. By simplifying the actual structure, the shutter flow field model is established. The exhaust temperature and infrared radiance of the ship's power system, as well as the structure and characteristics of the flow field, were simulated under the conditions of four different opening areas of the shutter. By analyzing the effect of the opening area of the shutter on the average temperature of the exhaust system, the variation law of the effect of the opening area of the shutter on the infrared radiation characteristics of the chimney is obtained. It is further found that when the opening area of the shutter is 0.6-0.65 of the side wall area, the infrared stealth performance of the ship's power exhaust will have a better effect.