Response Tests on the Unsteady Fluid Forces for the Oscillating Centrifugal Impeller

摆动离心叶轮非定常流体力响应试验

• 批准号: 06555055
• 负责人: TSUJIMOTO Yoshinobu
• 金额: $ 3.84万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555055/
• 关键词: Centrifugal Impeller; Self-excited Vibration; Rotordynamics; Compressor; Fluid Force; Tip Leakage Flow; ポンプ; 振動; 振れまわり; オープンタイプ; 非定常流体力測定; 歳差運動; 流体力モーメント; バルクフローモデル; 漏れ流れ; 非定常流れ

The first year was devoted to the estimation of the fluid force moment on the shroud of precessing impeller, from unsteady pressure measurements. It was shown that the destabilizing region increases as the increase is leakage flow rate, caused by the increase in the mean tangential velocity of the leakage flow. It was also found the increase of resistance at the outerradius causes the increase in the force measurements. A numerical analysis based on the bulk flow model was made. It was found that analysis can simulate most of important aspects experiments. It was also made clear that the leakage flow can be basically treated as a 2-D inviscid unsteady flow within variable clearance.In the 2nd year, direct force measurements on a whirling open-type compressor impeller which was designed and manufactured in the preceding year. To identify the phase relationship of the impeller rotation and the whirling motion, two triggering signals from the main shaft and the whirling sleeve was put in an AND circuit and a triggering signal was put out when the rotational and whirl signal were both on. The triggering signal was used to start accumulating the force signal in a FFT.An interesting result which suggests the possibility of both forward and backward whirl instability was obtained. However, a detailed inspection of the fluctuating force suggests the existence of unexpected shaft vibration. Hence we should continue the experiments to obtain more reliable data.

第一年致力于从非定常压力测量估计进动叶轮护罩上的流体力矩。结果表明，由于泄漏流的平均切向速度增大，失稳区域随着泄漏量的增大而增大。研究还发现，外径处阻力的增加导致了测力的增加。基于体流模型进行了数值分析。结果表明，该分析方法可以模拟大多数重要方面的实验。第二年，对前年设计制造的旋转开式压气机叶轮进行了直接测力试验。为了识别叶轮旋转和旋转运动的相位关系，将来自主轴和旋转套筒的两个触发信号输入AND电路，当旋转和旋转信号都打开时，输出触发信号。触发信号被用来开始累加FFT中的力信号，得到了一个有趣的结果，表明存在向前和向后旋转不稳定的可能性。然而，对脉动力的详细检查表明，存在意外的轴振动。因此，我们应该继续进行实验，以获得更可靠的数据。

项目成果

寺本憲博,岩崎晋 吉田義樹,辻本良信 大橋秀雄: "歳差運動する遠心羽根車シュラウドに作用する流体力モーメントの研究" 日本機械学会論文集(B編). 61. 3854-3861 (1995)

Norihiro Teramoto、Susumu Iwasaki、Yoshiki Yoshida、Yoshinobu Tsujimoto、Hideo Ohashi：“作用于进动离心式叶轮护罩的流体力矩的研究”日本机械工程师学会会刊（ed. B）61. 3854-3861（ 1995）

Norihiro TERAMOTO,Shin ISHIZAKI,Yoshiki YOSHIDA,Yoshinobu TSUJIMOTO and Hideo OHASHI: "Fluid Mement on a Centrifugal Impeller Shroud in Precession Motion" Transaction of the Japan Society of Mechanical Engineers. Vol.61, No.591. 3854-3861 (1995)

Norihiro TERAMOTO、Shin ISHIZAKI、Yoshiki YOSHIDA、Yoshinobu Tsujimoto 和 Hideo OHASHI：“进动运动中离心叶轮护罩上的流体运动”日本机械工程师学会会刊。

寺本憲博,石崎晋,吉田義樹,辻本良信,大橋秀雄: "歳差運動する遠心羽根車シュラウドに作用する流体力モーメントの研究" 日本機械学会論文集(B編). 61. 3854-3861 (1995)

Norihiro Teramoto、Susumu Ishizaki、Yoshiki Yoshida、Yoshinobu Tsujimoto、Hideo Ohashi：“作用于进动离心式叶轮护罩的流体力矩的研究”日本机械工程师学会会刊（ed. B）61. 3854-3861（ 1995）

寺本,石崎,吉田,辻本,大橋: "歳差運動する遠心羽根車シュラウドに作用する流体モーメントの研究" 日本機械学会第72期通常総会講演会講演論文集. (1995)

Teramoto、Ishizaki、Yoshida、Tsujimoto、Ohashi：“作用于进动离心式叶轮护罩的流体力矩的研究”日本机械工程师学会第 72 届普通大会论文集（1995 年）。