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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)
Technical Paper
2016-01-0720
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
- 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
- Ashutosh Gupta - Afton Chemical Corp.
- Huifang Shao - Afton Chemical Corp.
- Yinhui Wang - Afton Chemical Trading Co., Ltd.
Citation
Long, 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.Also In
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