• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Design Parameters for an Aircraft Engine Exit Plane Particle Sampling System
【24h】

Design Parameters for an Aircraft Engine Exit Plane Particle Sampling System

机译：飞机发动机出口平面颗粒采样系统的设计参数

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 experimental data and numerical modeling were utilized to investigate the effects of exhaust sampling parameters on the measurements of paniculate matter (PM) emitted at the exit plane of gas-turbine engines. The results provide guidance for sampling system design and operation. Engine power level is the most critical factor that influences the size and quantity of black carbon soot particles emitted from gas-turbine engines and must be considered in sampling system design. The results of this investigation indicate that the available soot surface area significantly affects the amount of volatile gases that can condense onto soot particles. During exhaust particle measurements, a dilution gas is typically added to the sampled exhaust stream to suppress volatile particle formation in the sampling line. Modeling results indicate that the dilution gas should be introduced upstream before a critical location in the sampling line that corresponds to the onset of particle formation microphysics. Also, the dilution gas should be dry for maximum nucle-ation suppression. In most aircraft PM emissions measurements, the probe-rake systems are water cooled and the sampling line may be heated. Modeling results suggest that the water cooling of the probe tip should be limited to avoid overcooling the sampling line wall temperature and, thus, minimize additional particle formation in the sampling line. The experimental data show that heating the sampling lines will decrease black carbon and sulfate PM mass and increase organic PM mass reaching the instruments. Sampling line transmission losses may prevent some of the particles emitted at the engine exit plane from reaching the instruments, especially particles that are smaller in size. Modeling results suggest that homogeneous nucleation can occur in the engine exit plane sampling line. If newly nucleated particles, typically smaller than 10 nm, are indeed formed in the sampling line, sampling line particle losses provide a possible explanation, in addition to the application of dry diluent, that they are generally not observed in the PM emissions measurements.
机译：利用实验数据和数值模型研究了排气采样参数对燃气轮机出口平面产生的颗粒物（PM）测量的影响。结果为采样系统的设计和运行提供了指导。发动机功率水平是影响燃气涡轮发动机排放的黑碳烟尘颗粒的大小和数量的最关键因素，在采样系统设计中必须予以考虑。这项研究的结果表明，可用的烟灰表面积显着影响了可凝结在烟尘颗粒上的挥发性气体的量。在排气颗粒测量期间，通常将稀释气体添加到采样的排气流中，以抑制在采样管线中形成挥发性颗粒。建模结果表明，稀释气体应在采样线中与颗粒形成微观物理过程相对应的关键位置之前引入上游。另外，稀释气体应干燥以最大程度地抑制成核。在大多数飞机的PM排放测量中，探针耙系统是水冷的，采样线可能会被加热。建模结果表明，应限制探头尖端的水冷，以避免过冷采样管线壁温，从而最大程度地减少采样管线中额外的颗粒形成。实验数据表明，加热采样线将减少黑碳和硫酸盐PM的质量，并增加到达仪器的有机PM的质量。采样线传输损耗可能会阻止在发动机出口平面发射的某些颗粒到达仪器，尤其是尺寸较小的颗粒。建模结果表明，在发动机出口平面采样线中会发生均相成核。如果在采样管线中确实形成了通常小于10 nm的新成核颗粒，那么除了使用干稀释剂外，采样管线中的颗粒损失还可能提供了一个解释，即通常在PM排放测量中未观察到它们。

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