National Aerospace Laboratory Kakuda Research Center
National Aerospace Laboratory Kakuda Research Center
National Aerospace Laboratory Kakuda Research Center
National Aerospace Laboratory Kakuda Research Center
National Aerospace Laboratory Kakuda Research Center
National Aerospace Laboratory Kakuda Research Center
During development of the liquid oxygen turbopump of the LE-7 (Liquid rocket Engine-7) engine, super synchronous shaft vibrations with a frequency of about 1.0 - 1.2 times that of the turbopump shaft rotational speed were often observed as the pump inlet pressure decreased. From the investigations of the cavitating inducer, it was shown that those super synchronous vibrations were caused by rotating cavitation and it deeply related with tip cavitation in the inducer. Cavitation tests of the liquid oxygen turbopump were performed to suppress these super synchronous vibrations using geometrically different inducer inlet suction rings. Tests were conducted using liquid nitrogen as working fluid at the high pressure turbopump test facility at the Kakuda Research Center. Results of these tests showed that an inducer inlet suction ring with moderately increased diameter of the inducer inlet was most effective to suppress rotating cavitation and it was also shown that the inducer delivery pressure did not change even when the cavitation number decreased.
LE-7液酸ターボポンプインデューサの回転非同期軸振動の抑制
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