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利用计算流体软件建立了扇形喷嘴内部流场的三维数学模型,采用标准k-ε湍流模型对其进行了数值模拟,分析了喷嘴主要结构参数对流场速度分布、压力分布和射流速度的影响。结果表明:收缩角对喷嘴内部流场,尤其是射流速度有较大的影响,以13°～15°为最佳;出口长径比对射流流态和射流速度均有一定的影响,宜在2～4之间更有利于喷嘴的射流;V形切槽的夹角对射流出口速度的影响较明显,在15°～30°时有较好的集束性,但射流速度不高,30°～45°有较好的射流速度,45°～60°可获得高的射流速度,但集束性较差。
A three-dimensional mathematical model of flow field inside a fan-shaped nozzle was established by using computational fluid software. The numerical simulation was carried out by using a standard k-ε turbulence model. The influence of the main structural parameters of the nozzle on the flow velocity distribution, pressure distribution and jet velocity was analyzed. The results show that the shrinkage angle has a great influence on the flow field inside the nozzle, especially the jet velocity, which is best from 13 ° to 15 °. The aspect ratio of outlet has a certain effect on jet flow and jet velocity. 2 to 4 is more conducive to the nozzle jet; V-shaped slot angle jet outlet speed is more obvious at 15 ° ~ 30 ° has better convergence, but the jet speed is not high, 30 ° ~ 45 ° has a good jet speed, 45 ° ~ 60 ° can get a high jet speed, but poor bundling.