Study of Unsteady Flame Structure of Pre Mixture in a Constant Volume Combustion Bomb by Vizualization Measurement of Flame Image

分析燃烧现象对降低能耗和解决大气污染问题是有效的。国内外学者对此进行了大量的研究，但仍停留在燃烧速度受气流速度影响的状态。本研究的最终目的是解决内燃机中的燃烧现象，目的是弄清燃烧速度与气体速度之间的关系。由于定容燃烧弹便于测量，因此实验采用定容燃烧弹进行。通过火焰截面图像分析了火焰结构。火焰的特征是火焰面积、火焰周长和火焰轮廓的不均匀性，气体速度的特征是平均速度和湍流强度，说明了气体速度的增加会使火焰面积和火焰周长增加。但高平均流速的条件也是高湍流度的条件。因此，燃烧速度的加速对燃烧速度的影响并不能确定是平均速度还是湍流强度，需要进一步研究平均速度和湍流强度对燃烧速度的影响。

Analysis of combustion phenomena is considered to be effective for reducing enegy consumption and resolving air pollution problems. Many studies have been made on this study, but they still remain the state that burning velocity is affected by the gas velocity. In this research, its last aim is to solve the combustion phenomena in an internal combustion engine, the aim is set to clarify the relation between burning velocity and gas velocity. Experiments were made using constant volume combustion bomb, because of its benefit of measurements. Flame structure was analyzed by the cross sectional image of flame. The characteristics of the flame are flame area, circumferential length and unevenness of flame outline, and the characteristics of gas velocity are the mean velocity and turbulence intensity.It was clarified that the men velocity accelerate to increase flame area and circumferential length. But the condition of high mean velocity is also the condition of high turbulence intensity. So influence of the acceleration of burning velocity can not be specified whether mean velocity or turbulence intensity.It is needed to further investigation to examine the effect of mean velocity and turbulence intensity to burning velocity.