高压无气喷涂扇形喷嘴内部流场数值模拟

Numerical Simulation of Internal Low Field on Hyperbaric Non-gas Spraying Nozzle

采用Fluent软件提供的Lamina层流模型对相同出口结构、不同入口结构的扇形喷嘴内部流场进行数值模拟,并分析比较了不同入口结构流体的压力梯度及速度变化情况,以及出口射流速度及流量大小。研究结果表明:入口结构变化越剧烈,流场的压力梯度和速度变化越大,结构变化越平缓,压力和速度变化越平缓;出口圆柱段对射流速度的影响不大;平行形入口结构的射流速度最大,平顶形与锥形入口结构次之;新设计的具有平缓收缩功能的维多辛斯基腔体的出口速度最大,且出口流量远大于其余3种腔体,平行形入口结构流量最小。

The sameexport structure and different inlet structures of the fan nozzle flow inner field is numerically simulated by the laminar flow model using Fluent software.Meanwhile,the model also analyses and compares pressure gradient structure and speed changes of different inlet fluid,as well as export jet velocity and flow size.The research shows that the more dramatic structural changes of entrance structure,the greater the pressure gradient and speed of change of the flow field,and the more gentle the structural changes,the more gentle pressure and velocity changes.Export cylindrical section has little influence on the jet speed.Parallel-shaped inlet structure has the minimum jet velocity,followed by flat-top shape with conical inlet structure.As for the outlet,the new design of Victoria Shinseki with the gentle systolic function has the maximum speed exit velocity,which is much larger than the other three cavity minimum flow rate.The parallel-shaped inlet structure has the smallest cavity.