适于旋流杯下游流场的改进型半分析关系式

利用典型(CFM-56燃烧室)旋流杯结构下游的流场实验数据,参照经验关系式,提出了物理意义更明确、拟合更准确、且更便于对大量实验数据进行相关性研究的半经验关系式,并与旋流杯下游紧靠出口处附近的轴向速度及旋流速度测量数据进行了对比,发现各特征数据(如峰值位置、峰值衰减速度、回流区宽度及其沿下游的发展、回流速度及其衰减等)与实验数据非常相符,从而初步验证了提出的半经验关系式.同时,给出了公式中不同的经验常数取值带来的变化,分析了与几何及工况参数之间可能的联系,为进一步验证该关系式打下基础.分析表明,各经验常数的变化之间相互独立,且物理意义明确,可以方便地用于进一步验证. 

Improved semi-analytical correlation approach for the flowfield downstream of swirl cups

An improved semi-analytical correlation was proposed for the prediction of the flowfields downstream a typical swirl cup on the basis of previous correlations proposed by Rizk & Mongia.The improved correlation has clear physical definition and is adequate for its constants determination by large amount of experimental data.The comparison between the selected experimental data and the predictions by the correlation is quite well,especially about the characteristic data such as the peak velocity,the radial location of the peak velocity,the decay of the velocity,the size of the recirculation zone,and the development of the recirculation zone.Meanwhile,the influences of the constants in the correlation are shown quantitatively,and the possible reason has been analyzed briefly.The analysis showed that all the empirical constants were independent with each other,thus the semi-analytical correlation could be used easily as further validation for different data.