Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine (PDF)
- 发表刊物：
- Applied Energy
- 摘要：
- The dynamics of cycle-to-cycle variations (CCV) was investigated in a natural gas direct-injection sparkignition engine. The method of continuous wavelet transform was used to analyze the time series of the
indicated mean effective pressure (IMEP) and other combustion variables. The dominant oscillatory modes in the CCV were identified, and the engine cycles over which these modes may persist were delineated.
Results were obtained for four compression ratios: CR = 8, 10, 12 and 14, at two engine speeds of 1200 and 1800 rpm. The results reveal that the CCV exhibit multiscale dynamics with fluctuations occurring at different timescales. At the engine speed of 1200 rpm, the spectral power of CCV for CR = 12 was found to be significantly reduced at the different timescales compared to the CCV at other values of CR. At the higher engine speed of 1800 rpm, this reduction was less pronounced. In addition, cross wavelet transform was used to explore the relationships between the CCV of IMEP and those of flame development duration, main combustion duration and total combustion duration. Strong interdependence was
found to exist between the IMEP and main combustion duration as well as total combustion duration, over a wide range of frequencies and engine cycles.
- 合写作者：
- Sen AK, Zheng JJ, Huang ZH
- 卷号：
- 2011, 88(7): 2324-2334
- 页面范围：
- 2324-2334
- 是否译文：
- 否
- 发表时间：
- 2011-03-17