中文摘要：

RFD（reversed flow diverter）是一种用于输送危险流体的免维修输送装置，由于在装置服役期内，人体无法近距离接触维修，因此必须避免运行中发生空化等威胁系统安全运行的工况。文中基于三维定常流控制方程，采用k-ε湍流模型及多相流空化模型对不同RFD 结构参数和操作参数进行了仿真。计算工况首先考察了基于不同背压的RFD 喷嘴直径和压冲压力对出水流量和水力效率的影响；其次，在最佳压冲压力范围内，考察了2种RFD直径比和3种背压下的初生空化发生时刻，认为相同条件下，RFD喷嘴直径比越小，背压越大的装置，抗空化效果越好，并提出了避免发生空化的操作压力范围，从而为RFD装置的工程应用提供了依据。

英文摘要：

RFD（reversed flow diverter）is a kind of maintenance-free pumping system which is useful for transferring hazardous liquid.The safety and reliability of the system must been guaranteed because any form of biological contact is not possible during its service period.Based on the 3D steady flow control equations,k-εturbulence model and cavitation model,RFD structure parameters and operating parameters have been studied in the paper.Firstly,the numerical simulation examines the effects of the kinds of nozzle diameter,RFD back pressures and operating pressures to the outlet flow and efficiency.Secondly,within the range of RFD driving pressure,initial cavitations are inspected under 2 kinds of RFD diameter ratio and 3 kinds of back pressure.It is believed that under the same conditions,the smaller RFD nozzle diameter ratio is,the greater the back pressure is,and the better anti-cavitation effect would be.At last,the optimum and non-cavitation operating pressure range are promoted which provides the basis for the RFD device application in industry.