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An Experimental Study on the Flame Dynamics with V- Gutter Type Flameholder in the Model Combustor

机译:V型槽式火焰保持器在模型燃烧器中火焰动力学的实验研究

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The flame dynamics and the longitudinal combustion instability in the duct combustor with the v-gutter type flameholder were investigated experimentally. The combustor has a long duct shape with a cross section area of 40 × 40 mm. The v-gutter type flameholder is mounted at the side wall of combustor. CNG were used as fuel, and the fuel was injected transversely into air crossflow. In order to study flame characteristics related to longitudinal combustion instability, various measurement techniques were applied: direct-photography, dynamic pressure measurement, Schlieren technique, CH and OH radical chemiluminescence and article image velocimetry (PIV). First, it is observed that the unstable flame shows a very different shape compared with a typical flame generated behind the flameholder. This longitudinal combustion instability is affected by the air mass flow rate, the flameholder geometry and nozzle open ratio. Flame dynamics near the flameholder was observed when the longitudinal combustion instability occurs in the duct combustor having a bluff-body flameholder. All images obtained from various imaging techniques shows flame moves back and forth near the flameholder due to the mixture velocity fluctuation near the flameholder.. Therefore, it is considered that it is liable to induce the longitudinal combustion instability in the duct combustor with a bluff-body flameholder.
机译:实验研究了带有v型槽型火焰保持器的管道燃烧器的火焰动力学和纵向燃烧的不稳定性。该燃烧器具有长的导管形状,其横截面积为40×40 mm。 V型槽型火焰保持器安装在燃烧室的侧壁上。使用压缩天然气作为燃料,并将燃料横向注入空气中。为了研究与纵向燃烧不稳定性相关的火焰特性,应用了多种测量技术:直接摄影,动态压力测量,Schlieren技术,CH和OH自由基化学发光法和物品图像测速仪(PIV)。首先,观察到不稳定的火焰与在火焰保持器后面产生的典型火焰相比具有非常不同的形状。这种纵向燃烧的不稳定性受空气质量流量,火焰保持器的几何形状和喷嘴开度的影响。当在具有钝体火焰保持器的管道燃烧器中发生纵向燃烧不稳定性时,观察到火焰保持器附近的火焰动力学。从各种成像技术获得的所有图像均显示,由于火焰保持器附近的混合速度波动,火焰在火焰保持器附近来回移动。因此,可以认为,在钝化器的作用下,导管燃烧室中的纵向燃烧不稳定很容易诱发。身体火焰保持器。

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