Abstract
Left ventricular assist centrifugal blood pump is a kind of low specific speed pump. The improvement of efficiency is difficult. In general, a positive displacement pump is suitable for the low specific speed region. Three kinds of single screw pumps, which have narrow gap between a rotor and a stator, were designed to prevent blood trauma. In this research, the experiment and the numerical analysis were carried out for these pumps, and also the pump characteristics and the leakage characteristics were investigated.
