同心环管圆孔射流流动特性的数值模拟

Numerical Simulation of Jets in Cross-flow in Concentric Annular Tubes

采用标准的k-ε模型及混合有限分析法对均匀横流条件下三维受限同心环管中单孔和双孔的横向紊动射流流动进行数值模拟.分别得到单圆孔不同流速比下的射流轨迹线与数学表达式、双圆孔不同间距下的速度场.结果显示:射流比越大,射流深度越深,射流越不容易发生弯曲;射流横断面上速度最大值的偏离程度随横流距离的增加而增大,但增大率越来越小;双孔射流孔间距影响射流轨迹线,由于前一个射流的遮挡作用,后面射流更不容易发生弯曲.

The standard k-e model and mixed finite analytic method are applied to numerically analyze the turbulent jet in cross flow of the single orifice and double orifice in the annular tubes entering the uni- form cross free stream. The paper has obtained the jet trace and mathematical expression with different ve- locity ratio of the single orifice and the velocity field with different spacing of the double orifice. The re- sults show that the greater the velocity ratio is, the deeper the jet depth is and the less prone to bend; the deviation of the maximum speed on the jet cross section becomes greater with the transverse distance in- creasing;the spacing of double orifice influences the jet trace, and the rear jet is less prone to bend with the block effect of the front jet.