方案摘要
方案下载| 应用领域 | 其他 |
| 检测样本 | 其他 |
| 检测项目 | |
| 参考标准 | 暂无 |
采用10KHz的Edgewave IS-8IIE激光器，泵浦Sirah Credo 倍频染料激光器作PLIF测量系统的激光源。用LaVision公司的HSS5型高速相机配备HS-IRO构成高速图像增强器作为成像部件，测量时间分辨的OH自由基的空间分布和随时间的演化。 采用Edgewave, IS-611DE 激光器作时间分辨PIV测量系统光源。用两台LaVisionHSS6型CMOS高速相机做成像部件，测量燃烧过程的流场分布随时间的变化。PLIF和PIV测量系统在LaVision公司的DaVis7.2软件平台控制下同步运行。
A series of measurements was performed on two technically-premixed, swirl-stabilized methaneair flames in an optically accessible gas turbine model combustor. The primary diagnostics used were combined OH-PLIF and stereoscopic PIV with simultaneous repetition rates of 10 kHz and measurement duration of 0.8 seconds. Also measured were acoustic and OH chemiluminescence. Analysis revealed strong local periodicity in the thermoacoustically self-excited (or ‘noisy’) flame in the regions of the flow corresponding to the inner shear layer and the jet-inflow. This periodicity appears to be the result of a helical precessing vortex core (PVC) present in that region of the combustor. The PVC has a precession frequency double that of the thermo-acoustic pulsation. A comparison of the various data sets and analysis techniques applied to each suggests a strong coupling between the PVC and the thermoacoustic pulsation in the noisy flame. Measurements of the stable (‘quiet’) flame revealed a global fluctuation in both velocity and heatrelease around 364 Hz, but no clear evidence of a PVC.
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