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Measurement of Local Mixture Strength at Spark Gap of S. I. Engines
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English
Abstract
In spark ignition engines, local fuel concentration of the mixture occupying the electrode spacing at the instant of spark discharge may be one of the important factors to dominate the combustion process and the cycle-by-cycle variation of combustion.
To make clear the above problems, a special sampling device has been developed. The sampling valve is equipped with the central electrode of the spark plug, which enables us to sample the mixture formed near the electrode spacing of the spark plug in the ordinary engine operation.
By applying this device, the mixture existing just before the occurrence of spark discharge can be taken repeatedly every cycle, and the cycle-by-cycle variation of mixture strength in the immediate vicinity of the electrode spacing was made clear. Further, it was found that the cycle-by-cycle variation of mixture strength formed in the electrode spacing at the instant of spark discharge increases by the engine operation with EGR.
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Citation
Matsui, K., Tanaka, T., and Ohigashi, S., "Measurement of Local Mixture Strength at Spark Gap of S. I. Engines," SAE Technical Paper 790483, 1979, https://doi.org/10.4271/790483.Also In
References
- Asanuma T. Yanagihara S. “Gas Sampling Valve for Measuring Scavenging Efficiency in High-Speed Two-Stroke Engines” SAE transactions 70 1962
- Ayusawa T. et al. “Relationship between Local Air-Fuel Ratio and Combustion Character in Spark Ignition Engines” SAE Paper 780147 1978
- Rhee K.T. Myers P.S. Uyehara O.A. “Time-and Space-Resolved Species Determination in Diesel Combustion Using Continuous Flow Gas Sampling” SAE Technical Paper 780226 1978