|Table of Contents|

Theoretical model and calculation of static leakage for train air tightness(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2020年01期
Page:
150-158
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Theoretical model and calculation of static leakage for train air tightness
Author(s):
LI Tian;  DAI Zhi-yuan;  ZHANG Ji-ye;  ZHANG Wei-hua
(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
Keywords:
vehicle engineering;  train air tightness;  static leakage;  pressure drop inside car body;  train aerodynamics
PACS:
U271.91
DOI:
10.19818/j.cnki.1671-1637.2020.01.012
Abstract:
Based on the one-dimensional isentropic flow theory, the state equations of static leakage for the train air tightness were derived. The calculation formulas for the leakage time of pressure drop and the total leakage time were obtained considering the flow coefficient of leakage hole. The dynamic process of static leakage for the train air tightness was numerically simulated. The effects of slenderness ratio of leakage hole and the initial air pressure inside the car body on the train air tightness were studied when the slenderness ratios are 1:1, 1:4, 1:8, and 1:16, and the initial air pressures inside the car body are 6, 5, 4, and 3 kPa, respectively. Analysis result shows that the pressure drop times calculated by the numerical simulation and the theoretical formula are 20.25, 20.23 s, respectively, when the air pressure inside the car body drops from 3.0 kPa to 0.8 kPa, and the relative errors between them and the experimental results are 1.41% and 1.51%, respectively. When the slenderness ratios of leakage hole are 1:8 and 1:16, the time history curves of air pressure drop inside the car body are basically the same, and the air flow rate of leakage hole remains unchanged. During the leakage process, the air flow velocity of leakage hole shows the distribution characteristics of large in the middle and small around. This is caused by the viscous effect of leakage hole wall surface. According to the central velocity and mass flow rate at the outlet section, the flow coefficient of leakage hole is 0.71. The effect of initial air pressure inside the car body on the same specified pressure drop time is less than 1%. If the pressure drop range is the same, the pressure drop time decreases with the increase of initial air pressure, the time for the pressure to drop from 4 kPa to 1 kPa is 24.18 s, and the time for the pressure to drop from 5 kPa to 2 kPa is 19.80 s. The maximum relative error between the results of numerical simulation and the theoretical calculation is 1.22%, indicating that the theoretical model and numerical simulation calculation method can be applied to calculate the leakage area or the air tightness of train. 2 tabs, 9 figs, 32 refs.

References:

[1] 王前选,胡哲龙,梁习锋,等.轨道车辆内部压力与车体气密性、外部压力的关系[J].交通运输工程学报,2018,18(4):103-111. WANG Qian-xuan, HU Zhe-long, LIANG Xi-feng, et al. Relationship among internal pressure, body air tightness and external pressure of rail vehicle[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 103-111.(in Chinese)
[2] 徐 威.高速列车气密性与人体安全标准研究[J].铁道车辆,1995,33(10):32-34. XU Wei. Study on air tightness and human safety standards of high-speed trains[J]. Rolling Stock, 1995, 33(10): 32-34.(in Chinese)
[3] 张光鹏,雷 波,李 琼.磁浮列车气密性能对隧道净空面积的影响[J].铁道学报,2005,27(2):126-129. ZHANG Guang-peng, LEI Bo, LI Qiong. Influence of maglev train sealing characters on the tunnel cross-section area[J]. Journal of the China Railway Society, 2005, 27(2): 126-129.(in Chinese)
[4] 钱立新.速度350 km·h-1等级世界高速列车技术发展综述[J].中国铁道科学,2007,28(4):66-72. QIAN Li-xin. Summary of the technical development of high-speed train with the speed of 350 km·h-1 in the world [J]. China Railway Science, 2007, 28(4): 66-72.(in Chinese)
[5] 王前选,梁习锋,任 鑫.列车高速通过隧道时车内压力波模拟试验研究[J].中南大学学报(自然科学版),2014,45(5):1699-1704. WANG Qian-xuan, LIANG Xi-feng, REN Xin. Experimental research on simulation of interior pressure of train passing through tunnel at high speed[J]. Journal of Central South University(Science and Technology), 2014, 45(5): 1699-1704.(in Chinese)
[6] 王悦新,张 畬,钟世航.高速列车通过隧道时产生的瞬变压力场和舒适度标准[J].铁道建筑,1994(1):10-12. WANG Yue-xin, ZHANG She, ZHONG Shi-hang. Transient pressure field and comfort standards for high-speed trains passing through tunnels[J]. Railway Engineering, 1994(1): 10-12.(in Chinese)
[7] 苏晓峰,程建峰,韩增盛.高速列车气密性研究综述[J].铁道车辆,2004,42(5):16-19. SU Xiao-feng, CHENG Jian-feng, HAN Zeng-sheng. Survey on research of air tightness of high-speed trains[J]. Rolling Stock, 2004, 42(5): 16-19.(in Chinese)
[8] JO Y D, AHN B J. Analysis of hazard areas associated with high-pressure natural-gas pipelines[J]. Journal of Loss Prevention in the Process Industries, 2002, 15(3): 179-188.
[9] OKE A, MAHGEREFTEH H, ECONOMOU I, et al. A transient outflow model for pipeline puncture[J]. Chemical Engineering Science, 2003, 58(20): 4591-4604.
[10] 闫 兵,董大伟,华春蓉,等.利用曲轴扭振相位特性诊断机车柴油机气缸气密性的新方法[J].铁道学报,2003,25(5):19-23. YAN Bing, DONG Da-wei, HUA Chun-rong, et al. A new diagnosis method of individual cylinder gas leakage by phase analysis of crankshaft torsional vibration[J]. Journal of the China Railway Society, 2003, 25(5): 19-23.(in Chinese)
[11] 张津津,马朝永,白 果,等.差压检测法在汽车制动主缸气密性检测中的应用[J].机械设计与制造,2007(5):116-118. ZHANG Jin-jin, MA Chao-yong, BAI Guo, et al. Differential pressure method applying on air tightness for brake master cylinder of automobile[J]. Machinery Design and Manufacture, 2007(5): 116-118.(in Chinese)
[12] 李玉洁,梅元贵.动车组车辆气密性指标的初步探讨[J].铁道机车车辆,2009,29(2):31-35. LI Yu-jie, MEI Yuan-gui. Primary discussion about pressure tightness of electric multiple units[J]. Railway Locomotive and Car, 2009, 29(2): 31-35.(in Chinese)
[13] 李国清,李 明,郭 伟,等.高速综合检测列车头车气密性评估[J].机车电传动,2012(3):45-48. LI Guo-qing, LI Ming, GUO Wei, et al. Leading car air tightness assessment of high-speed inspection train[J]. Electric Drive for Locomotives, 2012(3): 45-48.(in Chinese)
[14] KWON H B, YUN S H, NAM S W. Numerical simulation of pressure change inside cabin of a train passing through a tunnel[J]. Journal of Computational Fluids Engineering, 2012, 17(1): 23-28.
[15] KWON H B. A study on the minimum cross-sectional area of high-speed railway tunnel satisfying passenger ear discomfort criteria[J]. Journal of Computational Fluids Engineering, 2015, 20(3): 62-69.
[16] 刘冬雪,蒋雅男,杨明智.加减速时地铁列车隧道气动性能研究[J].铁道科学与工程学报,2018,15(1):178-187. LIU Dong-xue, JIANG Ya-nan, YANG Ming-zhi. Study on tunnel aerodynamic of subway train during acceleration[J]. Journal of Railway Science and Engineering, 2018, 15(1): 178-187.(in Chinese)
[17] 邵焕霞,梅元贵,周朝晖.高速空调客车通过隧道时车内压力波数值方法初探[J].铁道机车车辆,2006,26(1):31-33. SHAO Huan-xia, MEI Yuan-gui, ZHOU Chao-hui. Study on numerical simulation of pressure changes inside high-speed air-conditioned train passing through tunnels[J]. Railway Locomotive and Car, 2006, 26(1): 31-33.(in Chinese)
[18] 梅元贵,孙建成,许建林,等.高速列车隧道交会压力波特性[J].交通运输工程学报,2015,15(5):34-43. MEI Yuan-gui, SUN Jian-cheng, XU Jian-lin, et al. Crossing pressure wave characteristics of high-speed trains in tunne[J]. Journal of Traffic and Transportation Engineering, 2015, 15(5): 34-43.(in Chinese)
[19] 张光鹏,雷 波.计算高速列车车内压力的热力学模型[J].铁道学报,2006,28(1):35-38. ZHANG Guang-peng, LEI Bo. The thermal dynamics model for calculating the interior pressure of high-speed trains[J]. Journal of the China Railway Society, 2006, 28(1): 35-38.(in Chinese)
[20] 许良中,梁习锋,刘堂红,等.单车明线工况下高速列车室内压力波动研究[J].中南大学学报(自然科学版),2014,45(8):2878-2884. XU Liang-zhong, LIANG Xi-feng, LIU Tang-hong, et al. Pressure variation test inside full-scale high-speed train running in open area[J]. Journal of Central South University(Science and Technology), 2014, 45(8): 2878-2884.(in Chinese)
[21] SUN Zhen-xu, YANG Guo-wei, ZHU Lan. Study on the critical diameter of the subway tunnel based on the pressure variation[J]. Science China Technological Sciences, 2014, 57(10): 2037-2043.
[22] 陈春俊,聂锡成,唐 猛.车外空气压力作用下的CRH2型动车组车内空气压力传递函数模型[J].中国铁道科学,2013,34(4):84-88. CHEN Chun-jun, NIE Xi-cheng, TANG Meng. Transfer function model of the air pressure inside CRH2 EMU under outside air pressure[J]. China Railway Science, 2013, 34(4): 84-88.(in Chinese)
[23] 张方涛,李文彪,李 兵.动车组气密性技术探讨[J].铁道机车车辆,2015,35(6):44-46. ZHANG Fang-tao, LI Wen-biao, LI Bing. Technical discussion of the EMU air tightness[J]. Railway Locomotive and Car, 2015, 35(6): 44-46.(in Chinese)
[24] 彭光正,纪春华,葛 楠.气密性检测技术现状及发展趋势[J].机床与液压,2008,36(11):172-174. PENG Guang-zheng, JI Chun-hua, GE Nan. Current status and future development of air tightness detection technique[J]. Machine Tool and Hydraulics, 2008, 36(11): 172-174.(in Chinese)
[25] 李文夏,徐世东.高速动车组和客车气密性技术与标准[J].铁道技术监督,2013,41(5):10-12. LI Wen-xia, XU Shi-dong. Air tightness technology and standard of high-speed multiple unit and passenger car[J]. Railway Quality Control, 2013, 41(5): 10-12.(in Chinese)
[26] 王悦明.铁路客车空气压力密封性问题[J].铁道机车车辆,2000,20(4):4-7. WANG Yue-ming. Problem about the railway coach airproof[J]. Railway Locomotive and Car, 2000, 20(4): 4-7.(in Chinese)
[27] 刘和平,刘 然,刘殿海,等.超声波泄漏检测技术在高速动车组气密性方面的应用研究[J].机械设计与制造,2016(11):59-62. LIU He-ping, LIU Ran, LIU Dian-hai, et al. Application of ultrasonic leak detection on the air tightness testing of high speed EMU [J]. Machinery Design and Manufacture, 2016(11): 59-62.(in Chinese)
[28] 周俊超,贺竹林,韩 龙.高速列车气密性检测试验台测控系统的研究与实现[J].自动化技术与应用,2015,34(6):64-66. ZHOU Jun-chao, HE Zhu-lin, HAN Long. Research and implementation on the control system for high-speed train air tightness[J]. Techniques of Automation and Applications, 2015, 34(6): 64-66.(in Chinese)
[29] 尹法伟,陈兴刚,高兴华.动车组气密性试验装置的研制[J].铁道车辆,2014,52(7):35-36. YIN Fa-wei, CHEN Xing-gang, GAO Xing-hua. Research of EMU tightness test device[J]. Rolling Stock, 2014, 52(7): 35-36.(in Chinese)
[30] LI Tian, HEMIDA H, ZHANG Ji-ye, et al. Comparisons of shear stress transport and detached eddy simulations of the flow around trains[J]. Journal of Fluids Engineering, 2018, 140(11): 111108-1-12.
[31] LI Tian, QIN Deng, ZHANG Ji-ye. Effect of RANS turbulence model on aerodynamic behavior of trains in crosswind[J]. Chinese Journal of Mechanical Engineering, 2019, 32: 85.
[32] LI Tian, ZHANG Ji-ye, MOHAMMAD R, et al. On the Reynolds-averaged Navier-Stokes modelling of the flow around a simplified train in crosswinds[J]. Journal of Applied Fluid Mechanics, 2019, 12(2): 551-563.

Memo

Memo:
-
Last Update: 2020-03-24