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Effect of Oil and Gasoline Properties on Pre-Ignition and Super-Knock in a Thermal Research Engine (TRE) and an Optical Rapid Compression Machine (RCM)
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
High boost and direct injection are effective ways for energy saving in gasoline engines. However, the occurrence of super-knock at high load has become a main obstacle for further improving power density and fuel economy. It has been known that super-knock can be induced by pre-ignition, and oil droplet auto-ignition is found to be one of the possible mechanisms. In this study, experiments were conducted in a single-cylinder thermal research engine (TRE), in which different types of oil and surrogates were directly injected into the cylinder and then led to pre-ignition and super-knock. The effect of oil injection timing, oil injection quantity, different gasoline and different oil were tested. All the oil in this work could induce pre-ignition, even though their combustion phasing was much later than that in the case of n-hexadecane. Additionally, the effect of oil additives was investigated and the test results indicated that the addition of CaSulfonate and NaSulfonate tends to promote pre-ignition, while the addition of ZDDP and MoDTC tends to retard pre-ignition at certain conditions. Besides the tests in the single cylinder gasoline engine, experiments were carried out in a rapid compression machine (RCM) to investigate the auto-ignition process of a single oil droplet. Both the images acquired by the high speed camera and pressure traces showed that a single oil droplet could self-ignite in the stoichiometric mixture of iso-octane.
- Ashutosh Gupta - Afton Chemical Corp.
- Huifang Shao - Afton Chemical Corp.
- Yinhui Wang - Afton Chemical Trading Co., Ltd.
- Yan Long - Tsinghua University
- Zhi Wang - Tsinghua University
- Yunliang Qi - Tsinghua University
- Shouzhi Xiang - Tsinghua University
- Guang Zeng - Tsinghua University
- Peng Zhang - Tsinghua University
- Xin He - Tsinghua University
CitationLong, Y., Wang, Z., Qi, Y., Xiang, S. et al., "Effect of Oil and Gasoline Properties on Pre-Ignition and Super-Knock in a Thermal Research Engine (TRE) and an Optical Rapid Compression Machine (RCM)," SAE Technical Paper 2016-01-0720, 2016, https://doi.org/10.4271/2016-01-0720.
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