公开(公告)号：JP2000205973A

公开(公告)日：2000-07-28

申请号：JP334899

申请日：1999-01-08

Applicant: NAT AEROSPACE LAB

Inventor： WATANABE MITSUO ,  HASEGAWA SATOSHI

IPC: G01K15/00

Abstract: PROBLEM TO BE SOLVED: To calibrate a cryogenic liquid temperature measuring thermocouple with high accuracy and in a short time by use of an actual liquid such as liquid oxygen or nitrogen. SOLUTION: A vacuum heat isolated container 1 is filled with a cryogenic liquid and a thermocouple 31 is inserted into the cryogenic liquid; the same kind of gas as the cryogenic liquid is forced out into the cryogenic liquid by a gas blowout pipe 16 and the cryogenic liquid is agitated to allow the gas to dissolve into the liquid so as to elevate the liquid temperature. A certain liquid temperature and a saturated vapor pressure corresponding to the liquid temperature are thus created and calibration data are obtained from the cryogenic liquid temperature corresponding to the saturated vapor pressure and from the electromotive force of the thermocouple so as to calibrate the thermocouple.

公开(公告)号：FR2827640B1

公开(公告)日：2009-03-20

申请号：FR0209198

申请日：2002-07-19

Applicant: NAT AEROSPACE LAB

Inventor： HASHIMOTO TOMOYUKI ,  KANDA TAKESHI ,  WATANABE MITSUO ,  HASEGAWA SATOSHI ,  KUDO KENJI ,  MURAKAMI ATHUO ,  TANI KOUICHIRO

IPC: F02K9/46 ,  F04D29/58 ,  F04D29/66

Abstract: 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.

公开(公告)号：FR2827640A1

公开(公告)日：2003-01-24

申请号：FR0209198

申请日：2002-07-19

Applicant: NAT AEROSPACE LAB

Inventor： HASHIMOTO TOMOYUKI ,  KANDA TAKESHI ,  WATANABE MITSUO ,  HASEGAWA SATOSHI ,  KUDO KENJI ,  MURAKAMI ATHUO ,  TANI KOUICHIRO

IPC: F02K9/46 ,  F04D29/58 ,  F04D29/66

Abstract: The reduction system cools the fluid flowing into the rotary pump in order to reduce cavitation in the rotary pump (1).