Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Experimental Study of the Effect of Side Plate on the Coanda Effect of Sonic Jet

측판이 음속 제트의 코안다 효과에 미치는 영향에 관한 실험적 연구

  • Park, Sanghoon (Department of Aerospace and Mechanical Engineering, Graduate School, Korea Aerospace University) ;
  • Chang, Hongbeen (Department of Aerospace and Mechanical Engineering, Graduate School, Korea Aerospace University) ;
  • Lee, Yeol (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • Received : 2015.08.14
  • Accepted : 2016.03.15
  • Published : 2016.04.01
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Abstract

An experimental study for the characteristics of the thrust-vectoring of a sonic jet utilizing the coanda flap installed at a rectangular nozzle exit is performed. Two side plates are installed at both sides of the flap to decrease the three dimensional effects of the jet on the flap surface. Schlieren flow visualizations and quantitative measurements of the deflection angle of thrusting vector show that the side plates are able to delay the separation of the jet at the downstream of the flap surface. Substantial increase in the deflection angle of the jet as high as $72^{\circ}$ and small thrust loss as low as 7% are obtained by the present thrust-vectoring technique using the side plates.

사각노즐에서 발생한 음속제트의 코안다 효과를 이용한 추력편향 제어에 관한 실험적 연구가 수행되었다. 코안다 플랩 표면에서 나타나는 제트유동의 3차원 효과를 저감시키기 위하여 노즐 출구의 코안다 플랩 양쪽에 측판이 설치되었다. 쉴리렌 유동가시화 기법과 정량적인 추력편향각 측정을 통하여, 플랩 양쪽에 설치된 측판에 의하여 제트유동의 플랩 하류에서의 박리현상이 크게 지연되었음을 관찰하였다. 이에 따라 최대 72도의 높은 추력편향각과 약 7% 정도의 적은 추력손실이 관찰되었다.

Keywords

References

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