Experimental study on different infrared suppression measures for ship gas turbine exhaust system
[Objective]In order to effectively improve the infrared stealth capability of ships,it is necessary to reduce the infrared radiation characteristics of the ship gas turbine exhaust system within the band of 3-5 μm.[Methods]Experiments are carried out to measure the infrared radiation characteristic distribution of a ship gas turbine exhaust system within the band of 3 μm to 5 μm,and the influence of the deflection cone,ejector sleeve and spray cooling on the infrared radiation intensity of the exhaust system are then compared and ana-lyzed.[Results]When compared to a standard deflection cone exhaust injection model,the infrared radi-ation intensity of the ship gas turbine exhaust system decreases by 32.4%,21.9% and 61.5% at azimuth angles of 0°,45° and 90° respectively under spray cooling conditions.Without using the deflection cone,there is a decrease in radiation intensity by approximately 40.1% at an azimuth angle of 90°.The removal of the ejector sleeve effectively suppresses infrared radiation,with a decrease in radiation intensity of 29.5% at an azimuth angle of 0°,indicating that spray cooling significantly inhibits infrared radiation characteristics within the band of 3 μm to 5 μm at both large and small angles.[Conclusion]The results of this study can provide valuable references for ship infrared stealth design.
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