Measurements of engine gas temperature, velocities and early flame propagation

发动机气体温度、速度和早期火焰传播的测量

• 批准号: 129842743
• 负责人: Professor Dr. Christof Schulz
• 金额: --
• 依托单位: Lehrstuhl für Reaktive Fluide
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/129842743?language=en
• 关键词: Measurements; engine; gas; temperature; velocities

The sub-project mainly focuses on in-cylinder measurements of fluctuations in time and space, regarding gaseous properties and flame propagation, during the crucial process of ignition. To determine the wall heat flux and the kinetic of auto-ignition, high-resolution images of temperature fluctuations will be mapped within an optical accessible engine, due to laser-induced trace-fluorescence. Additional information of turbulent transport processes will be obtained at the same locations by two-dimensional Particle Image Velocimetry (PIV). Hence with this data, the performed LES results of near wall gaseous properties can be assessed.Further the influence of cyclic variations on the early flame propagation after auto-ignition will be investigated. This is carried out by a special Schlieren-technique with kHz rates of image sequences adapted to the curved geometry of the optical engine. These results are used to qualify the chemiluminescence measurements of sub-project .

该子项目主要关注点火关键过程中气体性质和火焰传播的缸内时间和空间波动测量。为了确定壁面热通量和自燃动力学，由于激光诱导的痕量荧光，温度波动的高分辨率图像将在光学可达引擎内绘制。二维粒子图像测速（PIV）将在同一位置获得湍流输运过程的附加信息。因此，利用这些数据，可以评估近壁气体性质的执行LES结果。进一步研究了循环变化对自燃后早期火焰传播的影响。这是通过一种特殊的纹影技术实现的，其图像序列的kHz速率适应于光引擎的弯曲几何形状。这些结果用于确定子工程的化学发光测量。