Effects of a shock wave generated by spark discharge on spark ignition characteristics

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20006889

Ishii, Kazuhiro; Shimomura, Hideo; Tsuboi, Takao

Effects of a shock wave generated by spark discharge on spark ignition process were studied using a combustion chamber in which a cylindrical shock wave reflector was fixed. The ignition unit was designed to produce capacitance sparks with short spark duration less than 1 {micro}s. By the intensity of OH radiation (206.4 nm), the induction time for ignition was defined as time interval from the spark discharge to the beginning of the OH radiation detection. By treating ignition phenomena as stochastic, probability of ignition detection per unit time, m{mu}, was obtained. One-dimensional numerical simulation was also made for analysis of flame-shock interaction process. The experimental results show that m{mu} decreases by the flame-shock interaction at the early stage of the ignition process. The numerical results indicate that this is because the reflected shock wave suppresses the flame kernel development. It is also found that at the late stage of the ignition process m{mu} with reflector is larger than that without it. This suggests possibility of decrease in cycle variation of torque in spark ignition engines.

• Research Organization: Yokohama National Univ., (JP)
• OSTI ID: 20006889
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
COMBUSTION KINETICS
COMBUSTION WAVES
ELECTRIC SPARKS
HYDROXYL RADICALS
MATHEMATICAL MODELS
MONITORING
SHOCK WAVES
SPARK IGNITION ENGINES