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为研究有低密度伴随的聚合射流氧枪射流流场,利用氧枪射流检测系统,对常温下(冷态)以空气模拟的射流进行了物理模拟。结合数值模拟结果,分析了传统无伴随流射流以及带有副孔氦气低密度伴随情况下射流流场的流动状态,讨论了在不同的滞止压力和环境温度时有、无伴随射流流场特性。结果表明,修正的k-ε双方程模型能较好地预测实验结果,伴随流的存在减缓了中心射流的沿程衰减,环境温度的变化影响射流在径向和轴向的流动状态。
In order to study the jet flow field of polymerized jet oxygen lance with low density, the jet simulated by air at room temperature (cold state) was simulated by oxygen lance jet detection system. Combining with the numerical simulation results, the flow states of the jet flow field under the traditional unconsumed jet flow and the low density helium gas with the secondary hole are analyzed. It is discussed that the jet flow field at different stagnation pressure and ambient temperature characteristic. The results show that the modified k-ε two-equation model can predict the experimental results well. The presence of the flow slows down the attenuation of the center jet and the change of the ambient temperature affects the radial and axial flow of the jet.