Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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An Investigation on the Spray Characteristics of a Compressed Natural Gas Injector

고압 천연 가스 인젝터의 분무 특성에 관한 연구

  • THONGCHAI, SAKDA (Graduate School of Department of Mechanical Engineering, University of Ulsan) ;
  • KANG, YUJIN (Graduate School of Department of Mechanical Engineering, University of Ulsan) ;
  • LIM, OCKTAECK (School of Mechanical Engineering, University of Ulsan)
  • Received : 2018.04.06
  • Accepted : 2018.04.30
  • Published : 2018.04.30
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Abstract

This study was carried out to investigate the injection characteristics of 800 kPa compressed natural gas compressed natural gas (CNG) injector developed in Korea. The CNG injector with multi-holes, employed in this experiment, was designed to inject CNG in the manifold at high pressure of 800 kPa. The spray macroscopic visualization test was carried out via Schlieren photography to study fuel-air mixing process. The fundamental spray characteristics, such as spray penetration, spray cone angle and spray velocity, were evaluated in the constant volume combustion chamber (CVCC) with varying the constant back pressure in CVCC from 0 to 1.8 bar. For the safety reason, nitrogen ($N_2$) and an acetone tracer were utilized as a surrogate gas fuel instead of CNG. The surrogate gas fuel pressures were controlled at 3, 5.5, and 8 bar, respectively. Injection durations were set at 5 ms throughout the experiment. The simulating events of the low engine speed were arranged at 1,000 rpm. The spray images were recorded by using a high-speed camera with a frame rate of 10,000 f/s at $512{\times}256pixels$. The spray characteristics were analyzed by using the image processing (Matlab). The results showed the significant difference that higher injection pressure had more effect on the spray shape than the lower injection pressure. When the injection pressure was increased, the longer spray penetration occurred. Moreover, the linear relation between speed and time are dependent on the injection pressure as well.

Keywords

References

  1. S. Moon, N. Jo, C. Nam, H. Lee, J. Kim, and W. Jeon, "A Numerical Study on Injection Pattern Characteristics of Fuel Systems", Korean Society of Automotive Engineering, KSAE17-B0145, 2017, p. 276.
  2. C. Bae and J. Kim, "Alternative fuels for internal combustion engines", Proceeding of the Combust Institute, Vol. 36, No. 3, 2017, pp. 3389-3413. https://doi.org/10.1016/j.proci.2016.09.009
  3. G. S. Settles, "Schlieren and shadowgraph Techniques", 1st edition, Springer, USA, 2001, pp. 23-46.
  4. A. Mazumdar, "Principles and Techniques of Schlieren Imaging", Columbia University, 2011, pp. 1-16.
  5. L. Yu, H. Hillamo, T. Sarjovaara, T. Hulkkonen, and O. Kaario, "Experimental Study on Structure and Mixing of Low-Pressure Gas Jet Using Tracer-Based PLIF Technique", SAE international Tech Pap, 2011, 2011-24-0039.
  6. J. Yu, V. Vuorinen, H. Hillamo, T. Sarjovaara, O. Kaario, and M. Larmi, "An Experimental Study on High Pressure Pulsed Jets for DI Gas Engine Using Planar Laser-Induced Fluorescence", SAE international Tech Pap, 2012, 2012-01-1655.
  7. J. Yu, V. Vuorinen, O. Kaario, T. Sarjovaara, and M. Larmi, "Visualization and analysis of the characteristics of transitional underexpanded jets", International Journal of Heat and Fluid Flow, Vol. 44, 2013, pp. 140-154. https://doi.org/10.1016/j.ijheatfluidflow.2013.05.015
  8. J. Yu, V. Vuorinen, H. Hillamo, T. Sarjovaara, O. Kaario, M. Larmi, "An experimental investigation on the flow structure and mixture formation of low pressure ratio wall-impinging jets by a natural gas injector", Journal of National Gas Science and Engineering, Vol. 9, 2012, pp. 1-10. https://doi.org/10.1016/j.jngse.2012.05.003
  9. A. Barriga-Rivera and G. J. Suaning, "Digital image processing for visual prosthesis: Filtering implications," 2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Boston, 2011, pp. 4860-4863.
  10. Mathworks. Image Processing ToolboxTM User'sGuideR2014b, 2014, p. 664.
  11. Y. Liu, J. Yeom, and S. Chung, "A study of spray development and combustion propagation processes of spark-ignited direct injection (SIDI) compressed natural gas (CNG)", Mathmatical and Computer Modeling, Vol. 57, No. 1-2, 2013, pp. 228-244. https://doi.org/10.1016/j.mcm.2011.06.035
  12. S. Lee, Y. Kim, and S. Park, "Spray Characteristics of the GDI Injector", Korean Society of Automotive Engineering, KSAE11-B0045, 2011, pp. 252-255.
  13. S. Lee and O. Lim, "An Investigation on the Spray Characteristics of DME with Variation of Nozzle Holes Diameter using the Common Rail Fuel Injection System", Korean Society of Automotive Engineering, Vol. 21, No. 4, 2013, pp. 1-7.