International Journal of Heat and Fluid Flow ( IF 2.6 ) Pub Date : 2021-06-17 , DOI: 10.1016/j.ijheatfluidflow.2021.108834 Mohammed Faheem , Aqib Khan , Rakesh Kumar , Sher Afghan Khan , Waqar Asrar , Mohd Azan Mohammed Sapardi
The effectiveness of cross wire in controlling the mixing characteristics of a circular and an equivalent elliptic jet is investigated experimentally. While circular jets are conventional, elliptic jets have gained attention due to their better mixing characteristics and faster decay. To further explore and augment the capabilities of elliptic jets for practical utility, it is investigated whether using an elliptic jet with cross wire control gives additional benefit in terms of mixing enhancement over an axisymmetric jet. Experiments are performed for subsonic and choked flow conditions with nozzle pressure ratios ranging from to . Time-averaged pitot pressures and schlieren visualization is used for diagnosis. The jet bifurcation can be seen in controlled elliptical jets at all nozzle pressure ratios (NPRs). Core length is reduced to as much as in the elliptical jet and in the case of the circular jet. The core length values estimated from the present data are compared with the previous investigations.
中文翻译:
横线对椭圆射流流场影响的实验研究
通过实验研究了交叉线在控制圆形和等效椭圆形射流的混合特性方面的有效性。虽然圆形射流是传统的,但椭圆射流因其更好的混合特性和更快的衰减而受到关注。为了进一步探索和增强椭圆射流的实用功能,研究了使用具有交叉线控制的椭圆射流是否在增强轴对称射流的混合方面提供额外的好处。实验是针对亚音速和阻塞流条件进行的,喷嘴压力比范围为 至 . 时间平均皮托管压力和纹影可视化用于诊断。在所有喷嘴压力比 (NPR) 的受控椭圆射流中都可以看到射流分叉。磁芯长度减少到 在椭圆射流和 在圆形射流的情况下。将根据当前数据估计的核心长度值与之前的调查进行比较。