A Study on the Characteristics of Design Variables for IRSS Diffuser

In modern naval ships, infrared signature suppression systems (IRSS) are installed to decrease the temperature of waste gas generated in propulsion engine and the metallic surface temperature of heated exhaust pipes. Generally, IRSS is composed of eductor, mixing tube, and diffuser. Diffuser serves...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2017-11, Vol.269 (1), p.12092
Main Authors: Cho, Yong-Jin, Ko, Dae-Eun
Format: Article
Language:English
Subjects:
Diffusers
Exhaust gases
Exhaust pipes
External pressure
Gas temperature
Heat transmission
Infrared signatures
Infrared suppression
Metal surfaces
Naval vessels
Performance evaluation
Surface temperature
Taguchi methods
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Summary:In modern naval ships, infrared signature suppression systems (IRSS) are installed to decrease the temperature of waste gas generated in propulsion engine and the metallic surface temperature of heated exhaust pipes. Generally, IRSS is composed of eductor, mixing tube, and diffuser. Diffuser serves to reduce the temperature by creating an air film using the pressure difference between internal gas and external air. In this study, design variables were selected by analyzing the diffuser and the characteristics of design variables that affect the performance of diffuser were examined using Taguchi experiment method. For the diffuser performance analysis, a heat flow analysis technique established in previous research was used. The IRSS performance evaluation was carried out based on the average area value of the metal surface temperature and the temperature of the exhaust gas at the outlet of the diffuser, which are variables directly related to the intensity of infrared signature in naval ships. It was verified that the exhaust gas temperature is greatly affected by changes in the diameter of the diffuser outlet, and the metal surface temperature of diffuser is greatly affected by changes in the number of diffuser rings.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/269/1/012092