Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지
DOI QR코드

DOI QR Code

Optimum Design of a Liquid Film Thickness Measurement Device Using Electric Conductance for Impingement Liquid Film

충돌 액막 분석을 위한 전기전도 액막 두께 측정장치 최적설계

  • Lee, Hyeongwon (Agency for Defense Development) ;
  • Lee, Hyunchang (School of Mechanical Engineering, Kyungnam University) ;
  • Kim, Taesung (Department of Aerospace Engineering, Seoul National University) ;
  • Ahn, Kyubok (School of Mechanical Engineering, Chungbuk National University) ;
  • Yoon, Youngbin (Institute of Advanced Aerospace Technology, Seoul National University)
  • 이형원 (국방과학연구소) ;
  • 이현창 (경남대학교 기계공학부) ;
  • 김태성 (서울대학교 우주항공공학전공) ;
  • 안규복 (충북대학교 기계공학부) ;
  • 윤영빈 (서울대학교 항공우주신기술연구소)
  • Received : 2018.07.31
  • Accepted : 2018.10.31
  • Published : 2018.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

To analyze the film cooling in a liquid rocket engine, it is necessary to understand the characteristics of the wall-impingement liquid film. We designed an optimal two-dimensional device for measuring the thickness of the liquid film thickness. This device quantitatively measures the liquid-film thickness distribution. In previous liquid-film thickness measuring devices, the liquid film was formed over the entire area of the sensor. However, its formation depended on injection conditions. To compensate for this, optimal resistors are selected. Additionally, saturation variations with partial saturation are analyzed. Furthermore, calibration using the enhanced plate method is conducted with improvements in spatial resolution. The device designed here can be used to analyze the properties of an impingement liquid film with a slit injector. This study can be used for film-cooling analysis in liquid rocket engines.

Keywords

HSSHBT_2018_v27n6_386_f0001.png 이미지

Fig. 1. Mechanism of electric conductance method

HSSHBT_2018_v27n6_386_f0002.png 이미지

Fig. 2. Photograph of liquid film thickness measurement device

HSSHBT_2018_v27n6_386_f0003.png 이미지

Fig. 3. Mechanism of electric conductance method

HSSHBT_2018_v27n6_386_f0004.png 이미지

Fig. 4. Specification of the measurement sensor

HSSHBT_2018_v27n6_386_f0005.png 이미지

Fig. 5. Basic calibration with changing resistor

HSSHBT_2018_v27n6_386_f0006.png 이미지

Fig. 6. Schematics of plate calibration method

HSSHBT_2018_v27n6_386_f0007.png 이미지

Fig. 7. Calibration device and the measurement sensor

HSSHBT_2018_v27n6_386_f0008.png 이미지

Fig. 8. Standard cell and taping calibration method

HSSHBT_2018_v27n6_386_f0009.png 이미지

Fig. 9. Calibration error between standard cell and neighbor cell

HSSHBT_2018_v27n6_386_f0010.png 이미지

Fig. 10. Average calibration curve with errors

HSSHBT_2018_v27n6_386_f0011.png 이미지

Fig. 11. Arrangement of the measurement sensor

HSSHBT_2018_v27n6_386_f0012.png 이미지

Fig. 12. Improvement on the sensor spatial resolution

Table 1. Kinds of fixed resistors

HSSHBT_2018_v27n6_386_t0001.png 이미지

References

  1. R. Arnold, D. I. Suslov, and O. J. Haidn, "Experimental investigation of film cooling with tangential slot injection in a LOX/CH4 subscale rocket combustion chamber" Trans. JSASS Space Tech. Jpn., Vol. 7, No. 26, pp.81-86, 2009.
  2. M. Damsohn and H. -M. Prasser, "High-speed liquid film sensor for two-phase flows with high spatial resolution based on electrical conductance", Flow Meas. Instrum., Vol. 20, No. xx, pp. 1-14, 2009. https://doi.org/10.1016/j.flowmeasinst.2008.06.006
  3. T. Kamei and A. Serizawa, "Measurement of 2-dimensional local instantaneous liquid film thickness around simulated nuclear fuel rod by ultrasonic transmission technique", Nucl. Eng. Des., Vol. 184, No. xx, pp. 349-362, 1998. https://doi.org/10.1016/S0029-5493(98)00208-8
  4. M. Alonso, P. J. Kay, P. J. Bowen, R. Gilchrist, and S. Sapsford, "A laser induced Fluorescence technique for quantifying transient liquid fuel films utilizing total internal reflection", Exp. Fluids, Vol. 48, No. xx, pp. 133-142, 2010. https://doi.org/10.1007/s00348-009-0720-8
  5. T. Inamura, H. Yanaoka, and T. Tomoda, "Prediction of mean droplet size of sprays issued from wall impingement injector", AIAA J., Vol. 42, No. 3, pp. 614-621, 2004. https://doi.org/10.2514/1.9112
  6. K. B. Lee, J. R. Kim, G. C. Park, and H. K. Cho, "Feasibility test of a liquid film thickness sensor on a flexible printed circuit board using a three-electrode conductance method", Sensors, Vol. 17, No. 1, pp. 42, 2017. https://doi.org/10.3390/s17010042
  7. K. B. Lee, J. R. Kim, D. J. Euh, G. C. Park, and H. K. Cho, "Development of Three-ring Conductance Sensor based on Flexible Printed Circuit Board for Measuring Liquid Film thickness in Two-phase Flow with High Resolution", J. Sens. Sci. Technol., Vol. 25, No. 1, pp. 57-64, 2016. https://doi.org/10.5369/JSST.2016.25.1.57