Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Surface Pressure Measurement on a Rotor Blade using Fast-Responding PSP

고속압력감응페인트를 이용한 로터 블레이드 표면 압력 측정

  • Received : 2013.09.04
  • Accepted : 2013.12.26
  • Published : 2014.01.01
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Abstract

The present study was conducted by using fast-responding PSP technique to measure the surface pressure on a small-scale rotor blade in hover. Also, the study was performed to verify the accuracy and investigate its possibility of PSP application for rotor blade pressure measurement. Pulsed laser which has 532 nm wavelength was used as a light source. Lifetime measurement technique was applied. Also, the coated paint on a rotor blade was porous PSP which has faster response time than conventional PSP. The blades had NACA0012 airfoils. The length of rotor blade was 340 mm and chord was 40 mm with rectangular shape 1 set, and 4 sets had several tip sweepback angles. The measured results qualitatively showed that the upper surface pressure decreases with increasing the collective pitch angle. Quantitative pressure coefficients of PSP results were higher approximately 0.4 to 0.7 than the pressure tap data of the NASA experiment.

본 논문은 고속압력감응페인트기법(Fast-Responding PSP)을 소개하고, 이를 이용하여 정지비행상태에 있는 축소형 로터 블레이드의 표면(윗면) 압력을 측정해봄으로서 PSP를 이용한 로터 블레이드 표면 압력 측정의 정확성과 그에 따른 실험기법의 타당성을 검증하기 위하여 수행되었다. 실험을 위한 광원으로는 532 nm 파장을 가지는 Pulsed laser를 사용하였고, PSP 측정 기법으로는 Lifetime 기법을 적용하였다. 또한, 모델 표면에 도포된 압력감응페인트는 반응성이 높은 Porous PSP가 사용되었다. 로터 블레이드는 NACA0012 익형을 가지고 있으며 길이 340 mm, 코드 40 mm의 직사각 형상 1종과 끝단의 후퇴각이 다른 4종의 형상을 사용하였다. 로터 블레이드의 콜렉티브 피치각 변화에 따른 표면 압력 분포를 측정하였으며 측정된 결과를 통해 콜렉티브 피치각이 증가할수록 윗면의 압력이 낮아지는 것을 정성적으로 확인하였고, 정량적인 압력계수는 NASA의 실험 데이터와 비교하여 약 0.4~0.7 정도 높은 경향성을 보였다.

Keywords

References

  1. Bell, J. H., "Application of Pressure-Sensitive Paint to Testing at Very Low Flow Speeds," 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, January, AIAA 2004-0878.
  2. Yamashita, T., Sugiura, H., Nagai, H., Asai, K., and Ishida, K., "Pressure-Sensitive Paint Measurement of the Flow around a Simplified Car Model," Journal of Visualization, Vol. 10, No. 3, 2007, pp.289-298 https://doi.org/10.1007/BF03181696
  3. Asai, K., Nakakita, K., Kameda, M., and Teduka, K., "Recent topics in fast-responding pressure-sensitive paint technology at national aerospace laboratory," Instrumentation in Aerospace Simulation Facilities, 19th International Congress on ICIASF 2001, Cleveland, OH, pp.25-36.
  4. Gregory, J. W., "Porous pressure- sensitive paint for measurement of unsteady pressures in turbomachinery," 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, AIAA 2004-0294.
  5. Wong, O. D., Neal Watkins, A., and Ingram, JoAnne L., "Pressure sensitive paint measurements on 15% scale rotor blades in hover," 35 th AIAA Fluid Dynamics Conference and Exhibit, San Francisco, CA, AIAA 2005-5008.
  6. Kumar, P., "Development of a single-shot lifetime PSP measurement technique for rotating surfaces," M.S. Thesis, The Ohio State University, Columbus, OH, 2010.
  7. Juliano, T. J., Kumar, P., Peng, D., Gregory, J. W., Crafton, J., and Fonov, S., "Single-shot, lifetime-based pressure-sensitive paint for rotating blades," Measurement Science and Technology, Vol. 22, No.8, 2011.
  8. Caradonna, F. X. and Tung, C., "Experimental and Analytical Studies of a Model Helicopter Rotor in Hover," NASA TM 81232, 1981.
  9. Jung, H. J. and Kwon, K. J. "Surface pressure measurement on a wing of SWIM by using PSP," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 36, No. 4, 2008, pp337-345. https://doi.org/10.5139/JKSAS.2008.36.4.337
  10. Liu, T. and Sullivan, J. P., "Pressure and temperature sensitive paints," Springer, New York, 2005.
  11. Goss, L., Jones, G., Crafton, J., Fonov, S., and Fonov, V., "Temperature Compensation for Lifetime-Based Pressure Sensitive Paint Systems" Instrumentation in Aerospace Simulation Facilities, 21st International Congress on ICIASF 2005, Sendai, Japan, pp.283-292.
  12. Sakaue, H., "Porous pressure sensitive paints for aerodynamic applications," MS Thesis, School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN, 1999.
  13. Kang, H. J. and Kwon, O. J., "Unstructured Mesh Navier-Stokes Calculations of the Flow Field of a Helicopter Rotor in Hover," Journal of The American Helicopter Society, Vol. 47, No. 2, 2002, pp.90-99. https://doi.org/10.4050/JAHS.47.90