摘要
为了研究超高压锥形喷嘴结构参数对流体微射流的影响,本文建立了流体微射流区域的物理模型,采用有限元四边形网格并采取局部加密的方式对整个微射流区域进行网格化分。选用标准k-ε双方程湍流模型,利用大型的CFD软件Fluent对不同结构参数的超高压锥形喷嘴进行了数值模拟。模拟结果表明,喷嘴的结构参数对流体射流具有较大的影响,对于喉部直径一定的超高压锥形啧嘴,最佳的喷嘴结构设计原则为:在一定范围内,随着喷嘴入口直径的增加,流体在整个射流区域内的射流速度增大且射流稳定性增强;喷嘴的入口直径一定时,最佳的啧嘴收缩角为13°;最佳的喷嘴喉部圆柱段长度为喉部直径的3倍左右。
In order to study the influence of structure parameters of ultra-high pressure taper nozzle on the micro-fluidization, a physics model of micro-fluidization field is set up. Quadrilateral elements with part closed are used in the grid division of entire micro-fluidization filed. With the standard k-ε dual equation turbulence model, some ultra-high pressure taper nozzles of different structure parameters are simulated by using the CFD software FLUENT The results show that the structure parameter of nozzle has a greater influence on flow jet. The optimal structure design principle for the ultra-high pressure taper nozzle at the same throat diameter is that the velocity of flow increases and the stability of flow strengthens in the entire micro-fluidization filed with the eye diameter of the taper nozzle increasing in the specified range, and the optimal shrink angle of the taper nozzle is at 13 degree when the eye diameter of the taper nozzle is fixedness and the best cylinder length is 3 times bigger than the throat diameter.
出处
《矿山机械》
北大核心
2009年第8期17-20,共4页
Mining & Processing Equipment
关键词
锥形喷嘴
微射流
结构参数
数值模拟
taper nozzle
Micro-fluidization
structural parameters
numerical simulation
