Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Mechanical Isolation Method for an Air Intake Duct with Vertical Temperature Gradient

수직 온도구배를 갖는 공기 흡입 덕트의 기계적 격리기법

  • Jung, Chihoon (The 4th R&D Institute - 5th Directorate, Agency for Defense Development)
  • Received : 2016.06.02
  • Accepted : 2016.07.12
  • Published : 2016.08.01
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Abstract

In a Direct Connect(DC) mode altitude engine test, a labyrinth seal is set up between an air intake duct and an engine. The labyrinth seal plays a key role in mechanically isolating them, which contributes to the accurate measurement of thrust and the other component forces. However, when high vertical temperature gradient is generated in the supplied air in the duct, the isolation breaks down. In this paper, a labyrinth seal control device is designed and installed in an effort to eliminate the issue. Test result shows the device successfully gets rid of the contact problem even when high vertical temperature gradient is produced.

직접 연결식(DC) 고도모의 엔진시험 수행 시, 공기 흡입 덕트와 항공용 엔진 사이에 래버린스 씰이 설치된다. 래버린스 씰은 이 둘을 기계적으로 격리시킴으로써 주추력 및 측추력을 보다 정확하게 측정할 수 있도록 돕는다. 하지만 덕트 내부 공급공기에 높은 수직 온도구배가 발생할 경우, 래버린스 씰의 격리가 파괴되어버린다. 본 논문에서는 이러한 접촉 문제를 해결하기 위한 노력의 일환으로 래버린스 씰 온도 제어장치를 제작/설치하였다. 본 장치를 실제 항공용 엔진시험에 적용한 결과, 높은 수직 온도구배가 생성되어도 래버린스 씰의 격리가 잘 유지되는 것을 확인할 수 있었다.

Keywords

References

  1. Mahmood, A., Thomas, J.B., Dean, S., "Measurement Uncertainty for the Uniform Engine Testing Program Conducted at NASA Lewis Research Center," NASA TM-88943, May. 1987.
  2. Arrington, E. Allen, Jose, C.G., "Flow Quality Improvements in the NASA Lewis Research Center 9- by 15-Foot Low Speed Wind Tunnel," 31st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, AIAA-1995-2390, San Diego, C.A., U.S.A., Jul. 1995.
  3. Ahn, D.C., Jung, C.H., Kim, J.W., Lee, K.J., "Mechanical Isolation Technique for the Intake with Non-axisymmetric Temperature Distribution in the Thrust Stand," 2015 Fall Conference on The Korea Institute of Military Science and Technology, pp. 690-691, Deajeon, Korea, Nov. 2015.

Cited by

  1. The Gross Thrust Estimation Technique of Air-Breathing Engine vol.22, pp.3, 2018, https://doi.org/10.6108/KSPE.2018.22.3.097