In order to gain runaway characteristics of two-way passage axial-flow pump installation, the axial-flow pump model with two-way flow passage installation in Zongyang Pump Station was used as an investigated object. The unsteady flow field in the installation was simulated numerically by using CFX software, based on the RANS equations and RNG k-ε turbulence model. The runaway speeds and flow rates were obtained under different heads. Finally, the unit runaway speed was worked out.The correctness of the numerical simulation was validated by comparison with the experimental results. The internal flow field in the pump installation shows an unstable pattern behind the pump and significant numbers of vertex occur in the outlet passage. The pressure distribution is irregular in the middle of the blade suction side, and a high pressure zone exists on the blade pressure side near the leading edge and on the blade suction side near the trailing edge, respectively. Moreover, the zone area increases with increasing runaway head. Flow separation exists at the blade trailing edge, and a low velocity region exists on the blade leading edge. The results can provide a good reference for design and safe operational management of the axial-pump installation.
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