工程热物理学报
工程熱物理學報
공정열물이학보
JOURNAL OF ENGINEERING THERMOPHYSICS
2009年
11期
1969-1972
,共4页
旋流燃烧%湍流非预混燃烧%PIV测量
鏇流燃燒%湍流非預混燃燒%PIV測量
선류연소%단류비예혼연소%PIV측량
swirling combustion%turbulence non-premixed combustion%PIV measurement
利用粒子图像速度场测量技术(PIV)对不同工况下的旋流非预混燃烧流场进行了测量,考察不同燃空速度比下旋流火焰的流动特性.结果表明,轴向截面上径向平均速度流场以燃烧器轴线呈中心对称,轴向平均速度、轴向脉动速度和径向脉动速度沿燃烧器轴线成对称分布,且轴向平均速度和轴向脉动速度的最大值出现在轴线处.随燃空速度比的增大,轴向平均速度和脉动速度增大,随着与燃烧器表面的距离增加,流场截面上轴向平均速度和脉动速度差异不断减小.
利用粒子圖像速度場測量技術(PIV)對不同工況下的鏇流非預混燃燒流場進行瞭測量,攷察不同燃空速度比下鏇流火燄的流動特性.結果錶明,軸嚮截麵上徑嚮平均速度流場以燃燒器軸線呈中心對稱,軸嚮平均速度、軸嚮脈動速度和徑嚮脈動速度沿燃燒器軸線成對稱分佈,且軸嚮平均速度和軸嚮脈動速度的最大值齣現在軸線處.隨燃空速度比的增大,軸嚮平均速度和脈動速度增大,隨著與燃燒器錶麵的距離增加,流場截麵上軸嚮平均速度和脈動速度差異不斷減小.
이용입자도상속도장측량기술(PIV)대불동공황하적선류비예혼연소류장진행료측량,고찰불동연공속도비하선류화염적류동특성.결과표명,축향절면상경향평균속도류장이연소기축선정중심대칭,축향평균속도、축향맥동속도화경향맥동속도연연소기축선성대칭분포,차축향평균속도화축향맥동속도적최대치출현재축선처.수연공속도비적증대,축향평균속도화맥동속도증대,수착여연소기표면적거리증가,류장절면상축향평균속도화맥동속도차이불단감소.
Experiments are performed to investigate the characteristic modes and structures of nonpremixed swirling flames.With PIV technique,the velocity distributions of the non-premixed swirling flames with difierent fuel jet to annular air flow velocity ratios are observed.The results show that the radial profiles of mean radial velocity are centro-symmetric along the axis of burner.The distributions of axial mean velocity,axial root-mean-squared fluctuating velocity(rms)and radial root-mean-squared fluctuating velocity are symmetrical along the axis of burner,and the maximums of axial mean and rms velocity are at the center of axial sections.With an increase of the fuel to air velocity ratio.axial mean and tins velocity add.By adding the distance between axial section and the surface of burner,the ditierences of the radial profiles of axial mean and rms velocity reduces continuously.