Experimental and Theoretical Studies of Unevenly Designed 4-bladed Inducers

不均匀设计的四叶导流轮的实验和理论研究

基本信息

批准号：
08555047
负责人：
TSUJIMOTO Yoshinobu
金额：
$ 1.66万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555047/
关键词：
Rocket Engine Inducer Cavitation Uneven Blades Alternate Blade Cavitation Rotating Cavitation Surge Synchronous Shaft Vibration 気泡流位相ドップラー法

项目摘要

Owing to the successful development of the H-II Rocket, Japan has caught up with the U.S.A.and Europe in terms of the technology of aerospace engineering. Rotating cavitation, however, was observed in the development stage of the turbopump inducers for H-II,ARIANE V and Space Shuttle. So, the rotating cavitation has been a common problem all over the world. Under such conditions, inducers should be designed by taking into account the higher suction performance but also the suppression of the rotating cavitation. In this study, we manufactured unevenly designed 4-bladed inducers and investigated the effective ways to suppress or avoid the rotating cavitation both theoretically and experimentally.(1) Both the alternate blade cavitation and rotating cavitation were analyzed theoretically. By a steady analysis, it was found that both even length cavitation and alternate blade cavitation do exist in some range of cavitation number. In such a case, it was also found by a stability analysis t … More hat the alternate blade cavitation is more stable than even length cavitation. Moreover, these analyzes were extended for the case of unevenly designed 4-bladed inducers, and the stabilities of rotating cavitation and alternate blade cavitation were examined.(2)A 4-bladed inducer was manufactured along the same guideline with the designment of 3-bladed inducer for LE-7. Another 4-bladed inducer, which has no swept back, was also manufactured to examine the effect of swept back through the comparison of experiments. Moreover, an inducer with slightly swepted blades at 1 blade intervals, which were modified from the inducer without swept back, was tested. It was found that the swept back has an effect on the suppression of both rotating cavitation and alternate blade cavitation.(3) Non-linear behavior was investigated by chaotic analysis of inlet pressure fluctuation, whereas theoretical analyzes in (1) were based on linear analyzes, and mainlyFourier analysis was used in experiments in (2). We herein investigated the possibility to derive the information about the unsteady cavitation by the observation of attracters in the phase portrait. Less

由于H-II火箭的成功发展，日本就航空工程技术的技术赶上了美国和欧洲。然而，在H-II，Ariane V和航天飞机的涡轮泵影响者的开发阶段观察到了旋转的空化。因此，旋转的空化是世界范围内常见的问题。在这种情况下，应通过考虑更高的任务性能和抑制旋转空化的抑制来设计诱导剂。在这项研究中，我们制造了不均匀设计的4叶片影响者，并研究了抑制或避免旋转空化的有效方法。（1）分析了理论上的替代刀片辐射和旋转的空化。通过稳定的分析，发现甚至在某些空化数量中都存在偶数长度的空化和替代叶片空化。在这种情况下，还可以通过稳定性分析发现……替代刀片空化的帽子更稳定，甚至比长度的空气囊更稳定。此外，针对不均匀设计的4叶片影响者的情况扩展了这些分析，并检查了旋转空化和替代叶片空化的稳定性。（2）沿着相同的指南制造了一个4叶片的影响者，设计了LE-7的3叶片影响者。另一位没有扫掠的4叶片影响者也制造出来，以检查实验的比较扫除的效果。此外，测试了以1叶片间隔略微扫叶片的诱导叶片，该叶片间隔是从诱导剂中修饰而不会扫掠的。发现扫向后背对抑制旋转空化和替代叶片空化的影响。（3）通过对入口压力波动的混乱分析研究了非线性行为，而（1）中的理论分析基于线性分析，并基于线性分析，并且在（2）中使用了主要的分析。我们在此研究了通过观察攻击者在肖像中的攻击者来得出有关非稳定气囊的信息的可能性。较少的