Effects of hydrogen addition on the laminar flame speed and Markstein length of premixed dimethyl ether-air flames (PDF)
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Effects of hydrogen addition on the laminar flame speed and Markstein length of premixed dimethyl ether-air flames (PDF)
- 发表刊物：
- Energy & Fuels
- 摘要：
- Laminar flame speeds of premixed dimethyl ether /hydrogen/air flames were measured in a constant volume bomb at different temperatures, equivalence ratios and hydrogen blending ratios. Results reveal that laminar flame speeds increase with increased hydrogen blending ratio and initial temperature. Wang model and Zhao model both perform well in predicting laminar flame speeds of the blends. Furthermore, three different models for effective Lewis number are validated and the volume fraction-weighted model performs well in predicting Markstein length. The effects of hydrogen addition on the flame speed and Markstein length of fuel blends are systematically studied. Chemical kinetic effect induced by hydrogen addition plays a dominant role in increasing the laminar flame speed in comparison with thermal and diffusive effect. In addition, there exists a critical equivalence ratio in the trend of Markstein length. At the equivalence ratio less than critical equivalence ratio, Markstein length decreases with increased hydrogen fraction, indicating that the addition of hydrogen enhances the diffusional thermal instability of the blends. While at the equivalence ratio larger than critical equivalence ratio, Markstein length increases with the increase of hydrogen mole fraction. Finally, the combined parameter (Ze (Le -1)) can reflect the trend of Lb which vary with hydrogen blending ratio.
- 合写作者：
- Yu HB, Hu EJ, Cheng Y, Yang K, Zhang XY, Huang ZH
- 卷号：
- 2015, 29(7): 4567-4575
- 页面范围：
- 4567-4575
- 是否译文：
- 否
- 发表时间：
- 2015-07-16