基于红外和纹影技术研究声作用下火焰锋面运动及热量演化

发布时间：2018-01-01 01:20

本文关键词：基于红外和纹影技术研究声作用下火焰锋面运动及热量演化　出处：《实验流体力学》2016年06期 　论文类型：期刊论文

【摘要】：以Rijke型驻波声场为声环境,以本生型层流部分预混火焰为实验对象,研究了火焰在声场作用下的锋面运动及热量演化行为。通过火焰红外图像表征燃烧反应产生的高温产物,借助火焰纹影图像描述径向温度梯度分布,并以红外-纹影信息一体化的图像说明了高温产物与径向温度梯度的关系。结果表明,声场作用下的部分预混火焰,其高温产物附着在锋面上,表现为层分布的对称型尖头结构,下游区域较上游区域幅面更宽;轴向热量演化过程以尖头状分布方式在声周期内经历2次升降过程,向火焰下游方向输运,径向热量传递过程所形成的温度梯度轮廓表现为"手指状",由高温产物的尖头结构及运动决定。
[Abstract]:The Rijke standing wave sound field was taken as the sound environment, and the partial premixed flame of the native laminar flow was used as the experimental object. The front motion and heat evolution behavior of flame under the action of sound field were studied. The high temperature product of combustion reaction was characterized by flame infrared image and the radial temperature gradient distribution was described by flame speckle image. The relationship between the high temperature product and the radial temperature gradient is illustrated by the image of the integration of infrared and schlieren information. The results show that the high temperature product adheres to the front surface of the partial premixed flame under the action of sound field. It is a symmetrical tip structure with layer distribution, and the downstream region is wider than the upstream region. The process of axial heat evolution goes through two ascending and descending processes in the sound cycle in the form of sharp head distribution, which is transported downstream of the flame. The temperature gradient profile formed by the radial heat transfer process is "finger like". It is determined by the sharp structure and motion of the high temperature product.
【作者单位】：浙江工业大学能源与动力工程研究所脉动技术工程研究中心;
【基金】：国家自然科学基金项目(51106139)
【分类号】：TK16
【正文快照】： 0引言研究声场与火焰的作用有着重要的工程价值和理论意义。一方面,声与火焰的耦合,将有效地组织燃烧过程,不仅强化了燃烧和传热,而且有效降低污染物的排放量,脉动燃烧技术是其典型代表;另一方面,燃烧过程中放热波动与压力脉动满足一定相位关系(瑞利准则),将诱发热声振荡,也称

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