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为了充分了解鱼雷网式过滤器内部流场分布规律,该文应用雷诺时均(Reynolds-Averaged Navier-Stokes,RANS)方程及RNG k-ε湍流模型,对过滤器内部全流场进行全流场数值模拟。结果表明:鱼雷部件和出水口边界条件对该过滤器的速度流场和压力场分布规律影响很大,鱼雷部件的影响是尤为突出;滤网及其内、外侧的水流流速沿X轴的变化规律分流速迅速增加、流速迅速减小和流速缓慢减小3个阶段;滤网内外压力分布有很大的的差异,滤网内侧压力沿X轴分布从迅速增加到缓慢减小、最后趋于稳定。而滤网外侧压力分布沿X轴的变化很大,特别是在出水口处压力迅速减少,压力沿X轴的波动幅度较大。滤网内侧压力比外侧的大,两者的压力差沿X轴越来越小,最大压力差为23 k Pa左右,最小压力差为0.5 k Pa。研究结果认为整个滤网堵塞不均匀,滤网堵塞呈现从尾部开始向出水口方向发展的趋势,对后续滤网的冲洗排污产生重要影响。该文建议在设定最佳排污压差时需要慎重考虑。
In order to fully understand the distribution of flow field inside the torpedo mesh filter, the Reynolds-Averaged Navier-Stokes (RANS) equation and the RNG k-ε turbulence model are applied to the full flow field of the filter Numerical Simulation. The results show that the boundary conditions of the torpedo component and the outlet affect the velocity distribution and the pressure field of the filter greatly, and the influence of the torpedo components is particularly prominent. The change of the flow velocity of the filter and its inside and outside along the X axis The flow rate increases rapidly and the flow velocity decreases rapidly and the flow velocity decreases slowly. There are great differences in pressure distribution inside and outside the filter, and the distribution of pressure inside the filter increases rapidly from X axis to slowly decrease, and finally tends to stable. However, the distribution of pressure on the outside of the filter changes greatly along the X-axis, especially the pressure at the water outlet decreases rapidly and the pressure fluctuates more along the X-axis. The pressure inside the filter is larger than the outside, and the pressure difference between the two is getting smaller and smaller along the X axis. The maximum pressure difference is about 23 kPa, and the minimum pressure difference is 0.5 kPa. The result shows that the whole filter block is unevenly clogged, the clogging of the filter screen tends to develop from the tail to the outlet, and has an important influence on the subsequent flushing and drainage of the filter screen. The paper suggests that careful consideration should be given when setting the optimal blowdown pressure.