著者
井上 剛志 堀部 朋宏 内海 政春 安達 和彦
出版者
一般社団法人 ターボ機械協会
雑誌
ターボ機械 (ISSN:03858839)
巻号頁・発行日
vol.40, no.6, pp.359-369, 2012 (Released:2015-03-27)
参考文献数
11
被引用文献数
1

A finite-element model is derived for high-pressure fuel turbopump(HPFTP)rotor system. It considers the effects of gyro-moment, axial force and rotor dynamic fluid forces acting on the impellers, the inducer, the seal, and the turbine. The damped natural frequencies, real parts of eigenvalues, and mode shapes of the rotor system are analysed over the range of 0∼45,000rpm and the results are validated by comparing them with existing experimental data. The effects of gyro-moment, axial force and rotor dynamic fluid forces on the dynamical characteristics of the system are investigated. As a result, it is shown that axial force has a small effect and is considered negligible, wheareas gyro-moment and rotor dynamic fluid force have a relatively large effect on the dynamical characteristics of the rotor system. The frequency response curve of the unbalance response of HPFTP is also obtained using a numerical simulation and the results correspond to its actual vibration phenomenon.
著者
瀧田 純也 船﨑 健 一 内海 政春 島垣 満
出版者
一般社団法人 ターボ機械協会
雑誌
ターボ機械 (ISSN:03858839)
巻号頁・発行日
vol.41, no.2, pp.78-88, 2013 (Released:2015-05-10)
参考文献数
12
被引用文献数
1

An application of optimization design process for reduction of Thomas force of rocket turbopump turbines is presented in this paper. Because of its special specification, rocket turbopump turbine blades have higher loading. In such a situation, there is a possibility of rotor vibration problem generated by turbine instability force, that is, “Thomas Force”. Actually in the past engine development in Japan, there was the shaft vibration problem due to “Thomas Force”. In order to reduce shaft vibrations, it is important to keep “Thomas Force” small. In this paper, the results of optimization for the existing rocket turbopump turbine by using Robust Design Process and Multi-Objective Genetic Algorithm(MOGA)are discussed.
著者
林 光昭 都丸 裕司 川崎 聡 志村 隆 内海 政春
出版者
一般社団法人 ターボ機械協会
雑誌
ターボ機械 (ISSN:03858839)
巻号頁・発行日
vol.41, no.10, pp.625-632, 2013 (Released:2015-07-23)
参考文献数
6
被引用文献数
6

In order to analyze a stability of the balancing mechanism for the axial thrust force in turbo-pumps, the simplified model expressing the essentials of dynamic behavior is shown. By the examination on that model, the dynamic characteristics in several working conditions are considered, it is shown that what kind of conditions determine the response and stability of the balancing mechanism.
著者
上村 典道 迫 悠冬 堀口 祐憲 内海 政春
出版者
一般社団法人 ターボ機械協会
雑誌
ターボ機械 (ISSN:03858839)
巻号頁・発行日
vol.48, no.10, pp.605-615, 2020

<p>This paper describes how to design turbo-pump inducers for a micro satellite launcher. The authors organized NASA's design criteria (NASA SP series) and some current design studies. To evaluate the design procedures and the design criteria, we designed inducers and conducted performance tests using a cavitation tunnel. As a result of the test, it was confirmed that we successfully developed high performance inducers that caused no severe cavitation instability phenomena, at the design flow coefficients of 0.09 and 0.1.</p>
著者
木村 俊哉 川崎 聡 島垣 満 内海 政春 後藤 公成
出版者
The Japan Society of Mechanical Engineers
雑誌
日本機械学会論文集 B編 (ISSN:03875016)
巻号頁・発行日
vol.78, no.787, pp.576-587, 2012

CFD simulations were performed for the leakage flow in the gap between the casing and the shroud of a centrifugal impeller. The effects of swirl brakes equipped in the casing on the leakage flow were numerically investigated. The leakage flow swirling due to impeller rotation was trapped inside swirl brakes and interacted with the walls of the swirl brake, generating a very complex flow and a vortex structure inside. By the interaction with swirl brakes, the leakage flow rapidly lost its angular momentum mainly in the outer region of the swirl brake. The loss of swirl resulted in a decrease of the pressure difference in the radial direction due to the centrifugal force effect. The radial distribution of pressure in the gap between the casing and the shroud was largely modified, and thus the axial thrust force on the impeller was changed as well. The thrust balance of the impeller can be adjusted by an appropriate design of swirl brakes and the instability of rotating shaft can be reduced by decreasing the swirl of the leakage flow.