In this study, the effect of initial temperature and fuel properties (such as ignition delay time variation with temperature) on knock characteristics was investigated for methane and propane dual fuels via a rapid compression and expansion machine, which can emulate one compression and expansion stroke in a real engine. Numerical calculations using CHEMKIN-PRO with AramcoMech1.3 were carried out to obtain fuel properties. The correlation between flame propagation velocity at the moment of autoignition and knock intensity was confirmed. The findings revealed that unburned mass fraction and initial temperature did not directly affect knock intensity. Additionally, experimental results were analyzed based on theories proposed by Zeldovich and Bradley. The results of the analysis indicated that smaller gradients of autoignition delay time and temperature caused the higher flame propagation velocity and the resultant higher knock intensity. It was concluded that initial temperature affected both the gradient of autoignition delay time and that of temperature, which in turn indirectly influenced the knock intensities.

在这项研究中，通过快速压缩和膨胀机研究了甲烷和丙烷双燃料的初始温度和燃料特性（例如，点火延迟时间随温度的变化）对爆震特性的影响，该模拟可以模拟一个压缩和膨胀冲程。一个真正的引擎。使用CHEMKIN-PRO和AramcoMech1.3进行了数值计算，以获得燃料特性。确认了自燃时火焰传播速度与爆震强度之间的相关性。这些发现表明未燃烧的质量分数和初始温度不会直接影响爆震强度。此外，根据Zeldovich和Bradley提出的理论对实验结果进行了分析。分析结果表明，自燃延迟时间和温度的梯度较小会导致较高的火焰传播速度并导致较高的爆震强度。结论是，初始温度既影响自燃延迟时间的梯度，又影响温度的梯度，进而间接影响爆震强度。