...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Time-Resolved Analysis of Turbulent Mixing Flow Characteristics of Intermittent Multi-Hole Diesel Spray Using 2-D PDPA
【24h】

Time-Resolved Analysis of Turbulent Mixing Flow Characteristics of Intermittent Multi-Hole Diesel Spray Using 2-D PDPA

机译：基于二维PDPA的间歇式多孔柴油机喷雾湍流混合流动特性的时间分辨分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The turbulent mixing flow characteristics of an intermittent diesel spray were investigated. A 5-hole diesel nozzle (d_n=0.32 mm) with a 2-spring nozzle holder, which is widely used in heavy-duty diesel engines, was tested. Time-resolved analysis of the turbulent mixing flow characteristics of the spray, injected intermittently into the still ambient air, was made under room temperature by using a 2-D PDPA system. The mean and the fluctuation velocities of the spray were measured. The axial velocity distribution shows similar to that of the free air jets at the downstream of the spray, and the distribution well coincides with the result proposed by Hinze at R/b < 1.5. The turbulent intensity of the axial velocity component is high near the spray axis, and it decreases gradually with the increase in the radial distance. The turbulent shear stress increases with proceeding to the trailing edge as well as the downstream of the spray. The maximum value of the turbulent shear stress is observed near R/b ≈ 1.0, regardless of the evolution time. The turbulent shear stress in the central parts of the spray is lower than that of the continuous free air jets, whereas that in the trailing edge is considerably higher.
机译：研究了间歇柴油喷雾的湍流混合流动特性。测试了带有2弹簧喷嘴座的5孔柴油喷嘴（d_n = 0.32 mm），该喷嘴广泛用于重型柴油发动机。使用2-D PDPA系统在室温下间歇地注入静止的环境空气中，对喷雾的湍流混合流动特性进行时间分辨分析。测量了喷雾的平均值和波动速度。轴向速度分布显示出与喷雾下游的自由空气射流相似，并且该分布与Hinze在R / b <1.5时提出的结果一致。轴向速度分量的湍流强度在喷雾轴线附近较高，并且随着径向距离的增加而逐渐减小。湍流切应力随着前进到后缘以及喷雾的下游而增加。无论演化时间如何，都可以在R / b≈1.0附近观察到湍流剪应力的最大值。喷雾中央部分的湍流剪切应力低于连续自由空气射流的湍流剪切应力，而后缘的湍流剪切应力要高得多。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号