Abstract
Blade stresses of 3-bladed inducer were measured under various cavitation numbers. At the transition point from asymmetric cavitation to cavitation surge, the pattern of the cavity on each blade changes irregularly with keeping the asymmetric cavitation pattern. The blade stress fluctuates between zero and a value observed under the non-cavitating condition. Under the firing test of LE-7 A engine for H-IIA rocket, the same phenomenon was observed through the measurement of shaft vibration. The result of that firing test is also shown for comparison.
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