The centrifugal pump is one of the most widely used fluid machinery. The low-specific-speed centrifugal pump exist three problems for lower efficiency, bad cavitation performance and unsteady flow. With the development of modern test technique and the CFD technology, the PIV measurement and the 3D unsteady turbulent flow simulation of a centrifugal pump considering of the impeller-volute interaction have attracted many researchers in the pump field recently. In this paper the unsteady flow phenomena a...