Autoignition of hydrogen under direct-injection compression-ignition engine conditions
The autoignition and combustion of hydrogen were studied in a constant-volume combustion vessel under simulated late-cycle, direct-injection (DI) diesel engine conditions. A strong Arrhenius dependence of ignition delay on temperature was observed; however, the ignition delay dependence on the other variables examined was small. The results show that a reasonable ignition delay (< 2 ms) can be achieved at ambient gas temperatures in excess of 1100 K for oxygen concentrations as low as 5%. In addition, the results show that DI hydrogen combustion rates are insensitive to these lower levels of oxygen. The insensitivity of ignition delay and combustion rate to reduced oxygen concentration is significant because it offers the potential for a dramatic reduction in emissions of nitric oxides from a compression-ignited DI hydrogen engine through use of large quantities of exhaust-gas-recirculation.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 82437
- Report Number(s):
- SAND--95-8562C; CONF-9504161--1; ON: DE95010760
- Country of Publication:
- United States
- Language:
- English
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