To study the effect of guide vane outlet angle on pump performance and impeller radial force in an axial-flow heart pump,guide vane outlet angle β4 is considered to be 20°,15°,10°,5° and 3°respectively. Based on ANSYS Fluent,numerical results of pump head and efficiency are validated by experiment results,in which Xanthan gum solutions are used with concentration of 0.06 wt. % as working fluid. Then,the effects of β4 on pump performance and impeller radial force are discussed,the errors of head and efficiency between test and simulation are within 5%. The results also indicate that the pump performance and efficiency are much better than those of other angles when guide vane outlet angle β4 is 10°,and the maximum variations in head and efficiency are 1. 9% and2. 2%,respectively. With β4 increasing,the pulsation of radial force decreases firstly and then increases,when β4 is 10°,the minimum pulsation is 0.0392 N,which is about 80% of the maximum pulsation amplitude.
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