Effects of ultra-high injection pressure and micro-hole nozzle on flame structure and soot formation of impinging diesel spray (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 ultra-high injection pressure and micro-hole nozzle on flame structure and soot formation of impinging diesel spray (PDF)
- 发表刊物：
- Applied Energy
- 摘要：
- The effects of ultra-high injection pressure and micro-hole nozzle on flame structure and soot formation of impinging diesel spray were studied with a high speed video camera in a constant volume combustion vessel. Two-color pyrometry was used to measure the line-of-sight soot temperature and concentration with two wavelengths of 650 and 800 nm. A flat wall vertical to the injector axis is located 30 mm away from the injector nozzle tip to generate impinging spray flame. Three injection pressures of 100, 200 and 300 MPa and two injector nozzles of 0.16 and 0.08 mm were used. With the conventional injector nozzle (0.16 mm), ultra-high injection pressure generates appreciably lower soot formation. With the micro-hole nozzle (0.08 mm), impinging spray flame shows much smaller size and lower soot formation at injection pressure of 100 MPa. The soot formation is too weak to be detected with the micro-hole nozzle at injection pressures of 200 and 300 MPa. Low air entrainment rate is responsible for the insensitive effect of ultra-high injection pressure on soot level with the conventional injector nozzle. Soot formation characteristics of impinging spray flame were compared with those of free spray flame using both the conventional and micro-hole nozzles at injection pressure of 100 MPa. With the conventional nozzle, flat wall impingement deteriorates soot formation significantly. While soot formation characteristics of free spray flame with the micro-hole nozzle are not altered obviously by flat wall. Liquid lengths for the nozzles of 0.16 and 0.08 mm are longer and shorter respectively than impingement distance (30 mm). Liquid impingement upon the wall is responsible for the deteriorated soot level of impinging flame compared to that of free flame with the conventional nozzle.
- 合写作者：
- Wang XG, Huang ZH, Zhang W, Kuti OA, Nishida K
- 卷号：
- 2011, 88(5): 1620-1628
- 页面范围：
- 1620-1628
- 是否译文：
- 否
- 发表时间：
- 2011-02-04