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 .

在关键的点火过程中，该次项目主要集中于时间和空间上波动，气态特性和火焰传播的缸内测量。为了确定壁热通量和自动点击的动力学，由于激光引起的痕量荧光，将在光学可访问发动机中映射温度波动的高分辨率图像。湍流传输过程的其他信息将通过二维粒子图像速度法（PIV）在相同位置获得。因此，使用这些数据，可以评估近壁气体特性的LES结果。将研究环状变化对自动点击术后早期火焰传播的影响。这是由特殊的Schlieren-Technique进行的，其图像序列的KHz速率适用于光发动机的弯曲几何形状。这些结果用于鉴定亚物体的化学发光测量值。