离心鼓风机整机内部流场数值模拟

摘要

采用稳态可压缩雷诺时均N-S方程、标准k-ε湍流模型和非结构化网格，应用计算流体力学软件Fluent对某离心鼓风机整机内流场进行了数值模拟，得出了鼓风机的整个运行工况曲线，对近设计工况点内部流场进行了深入分析。结果表明：风机在工作区内运行较为平稳，叶轮内部流道压力和速度变化过程合理，叶轮内部的流动损失较少；蜗壳的出口区域的回流状况和蜗壳内流动的不均匀性，使气流在蜗壳内的流动损失较大，是导致风机效率不高的重要原因，因此，需要通过对蜗壳的改型以达到提高效率的目的。%Based on steady compressible Reynolds-averaged Navier-Stokes equat-ion, standard turbulent model and unstructured grid, the whole internal airflow in a certain type centrifugal blower is numerically simulated through CFD software Fluent. The entire performance curve is plotted by the numerical results. The internal airflow field is also analyzed deeply near the design point. The results show that the blower is working in a safety zone. The change of the pressure and velocity at the whole flow channel is reasonably, and the flow loss of the impeller is small. The backflow in the export of the volute and the asymmetrical flow in the volute which lead to higher flow losses in the volute. Those are the important reasons leading to the low efficiency of the centrifugal blower. So the modification of the volute is needed to achieve the higher efficiency of blower.