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Research Activities of HFCV in Korea

Research Activities of HFCV in Korea. Speaker : Economy : The Republic of Korea. Research Activities of HFCV in Korea. 27 ~ 29, July, 2009. Ministry of Land, Transport and Maritime Affairs, Korea Transportation Safety Authority (Korea Automobile Testing and Research Institute). Contents.

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Research Activities of HFCV in Korea

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  1. Research Activities of HFCV in Korea Speaker : Economy : The Republic of Korea

  2. Research Activities of HFCV in Korea 27 ~ 29, July, 2009 Ministry of Land, Transport and Maritime Affairs, Korea Transportation Safety Authority (Korea Automobile Testing and Research Institute)

  3. Contents Hydrogen ? • Hydrogen Leakage Test • Driving Mode • Stop Mode • Rear Impact Test • Possibility of Hydrogen Discharge • Storage Verification Test • Summaries Hydrogen ?

  4. Air 10m/s 6M 12M 14.1M Hydrogen Leakage Test : Driving Mode • Goal : Verification of single failure conditions • Conditions • Driving speed: 36 km/h • Open space : 14.1 m x 12 m x 6 m • Leaking point: fitting area of high pressure fuel line and refilling line in the rear of a vehicle • Leaking flow : 131 NL per minute • Simulation Model • Tool : STAR-CCM+ • Mesh : polyhedral mesh (1,060,000) • Turbulence model : κ-ε model • Steady-state analysis

  5. A A B H2 Vol % 0.0 4.0 % AIR 10 m/s Driving Mode Simulation Results • Results • In hydrogen leaking area, hydrogen concentration level exceed 4 % by volume in air • Hydrogen was diffused by outside air flow Vehicle underbody view Section A-A Detail of B Air flow outside vehicle Velocity profile near storages area

  6. 34 33 27 26 29 25 32 24 22 23 28 30 31 20 21 18 19 Positions of sensors 1 3 10 6 11 5 9 4 7 2 Stop Mode Test Conditions (1) • Positions of hydrogen sensor Positions of sensors (under flower) • Expected hydrogen leaking points : • High(5)/low(4) pressure lines and engine room(2)

  7. Stop Mode : Test Conditions (2) Valve Valve Regulator Storage(35MPa) leakage Valve Regulator Valve Storage Hydrogen leakage device Single failure conditions test • Conditions of hydrogen leaking flow • 10 NL per minute : low leaking mode • 40 NL per minute : max. leaking mode before activation of excess flow valve • 131 NL per minute : leaking limit in FMVSS 301

  8. Hydrogen Leakage Test Results • Driving Mode • Diffused rapidly due to wind flowing outside vehicle • Sensors did not detect leaking hydrogen except sensors near leaking area • Stop Mode • Leaking hydrogen may enter into vehicle through holes on the bottom if hydrogen leaks underneath the body • Leakinghydrogen may enter into vehicle through running HFCV system if hydrogen leaks in engine room preventive measure needed • Hydrogen continued to leak for about 10 seconds before shutdown after 2 % hydrogen was detected  There were some area where Hydrogen up to 4 % was detected before shutdown. But concentration dropped below 4 % within one minute • Conclusions • Optimization of number of sensors and their locations is needed for effective detection depending on vehicle structure 2-3 sensors out of 5 sensors may be removed in case of Tucson HFCV • Interior sensors should be considered for detecting hydrogen entering from • outside

  9. Rear Impact Test (Fuel System Integrity) • Goal : Verification of fuel system integrity • Test Conditions • KMVSS article 91(FMVSS 305) : 48 km/h rear impact test • Filled with helium 90 % of normal working pressure • During the crash, opened storage valve (severe condition) • After crash test, evaluate hydrogen discharge • Test Vehicle • Mock up fuel cell vehicle BIW of HFCV SUV (Tucson) Mounted storages Sample vehicle

  10. Rear Impact Test Results : Hydrogen Discharge • After impact, no hydrogen discharge • High pressure sensor : 30 MPa • Low pressure sensor: 10 MPa

  11. Rear Impact Test Results : Verification Test of Storage • Verification Test of Storage • Storage was damaged due to deformation of suspension during impact • Verification test of damaged storage  No noticeable degradation Damaged carbon fiber layers of storage Under body rear suspension Verification test of damaged storage  Passed after 11,250 cycling tests at 103 MPa

  12. Summaries • Hydrogen Leakage Test (Single Failure Conditions) • Optimization of number of sensors and their locations is needed for effective detection depending on vehicle structure • 2-3 sensors out of 5 sensors may be removed in case of Tucson HFCV SUV • Interior sensors should be considered for detecting hydrogen entering from outside • Rear Impact Test (Fuel System Integrity) • Exterior of storage was damaged due to deformation of suspension during Impact No noticeable strength degradationafter endurance test • No malfunction in other storage components • Impact absorbing structure should be devised

  13. Thank you for your attention !

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