Abstract
To investigate the effect of inlet flow distortion on cavitation instability, unsteady pressure and blade stress fluctuation were observed in a 3-bladed inducer. The inlet flow distortions were generated by using screens installed upstream of the inducer. In addition, the effect of the frequency of the fluctuation of the angle of attack caused by the inlet flow distortion was examined with three screens. The following results were obtained : (1) The present inlet flow distortions have almost no effect both on the pressure and cavitation performances. (2) The conventional and higher order rotating cavitations were suppressed by the present inlet flow distortion. However, the occurrence of the conventional cavitation surge was enhanced at lower cavitation number. (3) Amplitude of the blade stress fluctuation caused by the inlet flow distortion decreased with increasing of the frequency of the fluctuation of the angle of attack. (4) The phase difference between the blade stress fluctuation due to the inlet flow distortion and the fluctuation of the angle of attack increased as decreasing of the cavitation number.
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