Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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A Study on the Contribution of Exterior Devices to Running Resistance in High-Speed Trains

고속열차 외부장치에 의한 주행저항 기여도 연구

  • Received : 2015.06.01
  • Accepted : 2015.07.23
  • Published : 2015.08.31
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Abstract

The contribution of exterior devices such as bogie fairings and pantographs to running resistance was estimated on the basis of coasting tests at up to 350 km/h with the help of the Korean Next Generation High speed train (HEMU-430X). In order to assess the reduction of air resistance by nose car's bogie fairing, coasting tests were conducted with a removable bogie fairing at various speed ranges. And, the contribution of the pantograph to air resistance was also estimated with coasting tests that include the pantograph's rising and descent modes. The linear regression method was used to examine decelerations from time-velocity data and the equation of resistance to motion is proposed from the deceleration data. From the aerodynamic term of the equation of resistance to motion, the contribution to air resistance by nose car's bogie fairing and pantograph was estimated. The results show that the air resistance was reduced by about 3.8% by the nose car's bogie fairing. And, the 3.9% increase of air resistance by the pantograph (open knee mode) has been found.

고속열차의 외부장치인 선두부 대차 페어링과 팬터그래프에 의한 주행저항 기여도를 차세대 한국형 고속열차(HEMU-430X)를 이용하여 최대 350km/h까지의 타행시험을 통하여 간접적으로 평가하였다. 선두부 대차페어링에 의한 공기저항 저감도를 평가하기 위하여 대차 페어링을 부착 및 탈착 하였을 때 각각 타행시험을 속도대역별로 실시하였다. 또한, 팬터그래프에 의한 공기저항을 측정하기 위하여 팬터그래프를 상승 및 하강 시켰을 때 각각 타행시험을 실시하였다. 타행시험의 결과로부터 시간-속도선도에 대한 가속도를 선형회귀법으로 산출하여 주행저항식으로 도출하였고, 도출된 주행저항식의 공기저항계수 부분을 이용하여 대차 페어링 및 팬터그래프의 공기저항 기여도를 산출하였다. 그 결과 선두부 대차 페어링의 공기저항 감소효과는 약 3.8%이며, 비상모드 팬터그래프는 공기저항을 약 3.9% 증가시키는 것으로 평가되었다.

Keywords

References

  1. B.P. Rochard, F. Schmiding (2000) A review of methods to measure and calculate train resistances, Journal of Railway and Rapid Transit, 214, pp. 185-199. https://doi.org/10.1243/0954409001531306
  2. H.B. Kwon, H.K. Oh (2013) Decomposition and reduction of aerodynamic drag of high-speed train, Proceedings of the WCRR 2013, Sidney.
  3. S.W. Kim, H.B. Kwon, Y.G. Kim, T.W. Park (2006) Calculation of resistance to motion of a high-speed train using acceleration measurements in irregular coasting conditions, Journal of Railway and Rapid Transit, 220, pp. 449-459. https://doi.org/10.1243/0954409JRRT74
  4. H.B. Kwon, S.W. Kim and H.K. Oh (2014) Assessment on the Running Resistance of High-speed Train Using Coasting Test, Journal of the Korean Society for Railway, 17(3), pp. 165-170. https://doi.org/10.7782/JKSR.2014.17.3.165
  5. H.B. Kwon, J.S. Hong (2013) Aerodynamic drag reduction on high-performance EMU train by streamlined shape modification, Journal of the Korean Society for Railway, 16(3), pp. 169-174. https://doi.org/10.7782/JKSR.2013.16.3.169
  6. J.S. Moon, S.W. Kim and H.B. Kwon (2014) A study on the aerodynamic drag reduction of high-speed train using bogie fairing, Journal of Computational Fluids Engineering, 19(1), pp. 41-46. https://doi.org/10.6112/kscfe.2014.19.1.041
  7. H.B. Kwon, Y.H. Park, D.H. Lee, M.S. Kim (2001) Wind tunnel experiments on Korean high-speed trains using various ground simulation techniques, Journal of Wind Engineering and Industrial Aerodynamics, 89, pp. 1179-1195. https://doi.org/10.1016/S0167-6105(01)00107-6
  8. J.L. Peters (1983) Aerodynamics of very high speed trains and maglev vehicles: state of the art and future potential, International Journal of Vehicle Design, Special publication SP3, pp. 308-341.
  9. Y. Lee, J. Rho, M. Kwak, J. Lee, et al. (2010) Experimental studies on aerodynamic characteristics of various types of pantograph for high speed train, The 8th Euromech Fluid Mechanics Conference(EFMC8), Bad Reichenhall, Germany.
  10. J. Rho, Y. Lee, K. Kim, D. Lee (2010) Experimental Investigations on Aerodynamic Characteristics of scaled Pantograph System with various Panhead Shape for High Speed Train, 6th IUTAM Symposium on Bluff Body Wakes and Vortex Induced Vibrations, Capri Island, Italy.
  11. H.B. Kwon, Y.H.. Cho, K. Lee, K.N. Kim (2009) A real-scale wind tunnel testing on a pantograph for high-speed train to assess the aerodynamic characteristics, Journal of the Korean Society for Railway, 12(5), pp. 732-737.
  12. T. Ko, K.N. Kim (2013) Numerical simulation for the pantograph of new-generation high-speed train, Proceedings of KSCFE Spring Conference 2013, Jeju, pp. 148-151.
  13. S.H. Ryu, J.H. Hong (2011) A study on overall measurement system development of HEMU-400X, Journal of the Korean Society for Railway, 14(6), pp. 484-488. https://doi.org/10.7782/JKSR.2011.14.6.484
  14. K.H. Kim, C.Y. Kim, H.K. Oh (2013) Aerodynamic design of lower acoustic noise/aerodynamic drag pantograph system for high speed train, Appendix pp. 33, pp. 116-117.

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