不同流量下全自动网式过滤器内部流场的数值模拟

Numerical Simulation of Internal Flow Field in Automatic Screen Filter under Different Flow

由于自清洗过滤器自动化程度高而越来越受到重视,但传统的实物模型研发周期长、费用高。为此,运用FLUENT 6.3软件对全自动网式过滤器在不同流量下的清水流场进行模拟,并分别选取流量为100、200、300m3/h的3种工况,提取典型断面的关键数据,获得速度云图和压强云图。结果表明,虽然流量的改变对过滤器流场影响不大,但是随着流量的增大,水头损失会变大,且滤网所承受的速度差和压强差也在增大,这会导致滤网过滤效率降低、寿命减少等问题。因此,在选择过滤器最适合的工作流量时,应结合实际情况综合考虑灌溉流量、灌水时间、水质、过滤器数量等因素。

Owing to high degree of automation for self-cleaning filter, more and more attention is paid to its research. The traditional physical model has disadvantages of a long development cycle and high cost. Consequently, the software of FLUENT 6.3 was used to simulate clear-water flow field of automatic filter under different flow. Meanwhile, we se lected three operating conditions of 100, 200 and 300 m3/h to extract the key data of the typical section and gained the velocity cloud and the pressure cloud. The results show that the change of flow has little impact on the flow field of the filter. But with the flow increases, the head loss will become large, and the differences of velocity and pressure in the filter also will increase, which brings the problem such as efficiency decreasing and life reduction. Therefore, we should com- bine with the actual situation and consider the factors （flow, time, water quality and the number of filter） to chose the optimal flow for the filter.