Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Study on the Characteristics of Long Wave Infrared Signal by Water Injection around the Exhaust Plume of the Micro-jet Engine

마이크로 제트엔진 배기플룸 주위 물 분사에 따른 장파장 적외선 신호특성 연구

  • Yu, Gunwon (Aerospace Engineering Department, Jeonbuk National University) ;
  • Choi, Seongman (Aerospace Engineering Department, Jeonbuk National University)
  • Received : 2021.12.03
  • Accepted : 2022.02.15
  • Published : 2022.04.30
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Abstract

An experimental study was carried out to understand the characteristics of the long wave infrared signal emitted from the exhaust plume when water is sprayed around it. The micro-jet engine was used to generate the exhaust plume, and eight water spray nozzles were installed around the exhaust nozzle. Two water injection angles were applied, one is sparying parallel to the exhaust plume, and the other is spraying water into the exhaust plume. The measurement results are as follows. When spraying water parallel to the exhaust plume, the long wave infrared signal is decreased with water spray flow rate. When spraying water the exhaust plume, the long wave infrared signal shows a larger value than plume only.

배기플룸 주위에 물을 분사할 경우 배기플룸에서 방출되는 장파장 적외선에 대한 특성을 알기 위하여 실험적인 방법으로 연구를 수행하였다. 배기플룸을 생성하기 위하여 마이크로 제트엔진을 사용하였으며, 배기노즐 주위에 8개의 물 분사노즐을 배치하였다. 물을 배기플룸과 평행하게 분사하여 배기플룸을 감싸거나, 또는 배기플룸 내에 물을 분사하는 두 가지 분사각도를 적용하였다. 장파장 적외선 신호 측정결과 물을 배기플룸과 평행하게 분사할 경우 물 분사유량에 따라 적외선 신호는 감소되었다. 배기플룸 내에 물을 분사할 경우, 적외선 신호는 배기플룸만 분사하는 경우보다 오히려 큰 값을 나타내는 것으로 측정되었다.

Keywords

Acknowledgement

본 연구는 방위사업청과 국방과학연구소가 지원하는 항공 피탐지 감소기술 특화연구실 사업의 일환으로 수행되었습니다.

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