National Aerospace Laboratory of Japan

Tomoyuki Hashimoto

Kenji Kudo

Athuo Murakami

Takeshi Kanda

Mitsuo Watanabe

Satoshi Hasegawa

Kouichiro Tani

Cavitation is reduced in a rotary pump while the pump performance is maintained by utilizing a low-temperature fluid source already present in the pump system. The fluid from the low-temperature fluid source receives heat from the fluid flowing to the pump, thereby lowering its temperature and the saturated vapor pressure, which increases the allowable margin for a decrease in fluid pressure and reduces the occurrence of cavitation. The pump system may be used for a liquid rocket engine. The fluid velocity of the fluid directed to the pump is low before releasing heat, so there is only a slight pressure loss at the pump. Accordingly, the temperature is lowered and the occurrence of cavitation is reduced within the pump.

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Kakuda, Japan

Tomoyuki Hashimoto