A STUDY ON THE LEAKAGE-FLOW-INDUCED VIBRATIONS IN A TWO-DIMENSIONAL NARROW PASSAGE

二维狭窄通道中漏流振动的研究

• 批准号: 03452138
• 负责人: HAYAMA Shinji
• 金额: $ 4.1万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452138/
• 关键词: LEAKAGE-FLOW; TOW-DIMENSIONAL FLOW; FLUID EXCITING FORCE; FLOW-INDUCED VIBRATION; INSTABILITY; SELF-EXCITED VIBRATION; CRITICAL VELOCITY; 連成振動

Severe self-excited vibrations occur frequently in mechanical structures with narrow leakage-flow passages. Based on the previous studies on one-dimensional leakage-flow-induced vibrations, the authors have applied the one-dimensional theory to the two-dimensional leakage-flow-passages and calculated numerically the pressure distributions in an eccentric annular passage to analyze the stability of leakage-flow-induced vibrations in two-dimensional narrow passages.In the calculations of pressure distributions in the eccentric annular passages a leakage-flow scheme was applied, where diffuser effects were neglected in the circumferential flow. The calculated pressure distributions were in fairly well agreement with those by experiments, which has proven the validity of the leakage-flow scheme proposed in calculations of pressure distributions in eccentric annular passages.As a result, it is found that, in parallel and convergent passages in the axial direction, fluid forces acting on the passage walls are positive restoring forces and in divergent passages they become negative restoring forces. The calculated critical velocities for the flutter-type instability were also in good agreement with experiments.

严重的自激振动经常发生在具有狭窄漏流通道的机械结构中。本文在前人对一维泄漏流激振研究的基础上，将一维理论应用于二维泄漏流通道，并对偏心环形通道内的压力分布进行了数值计算，分析了二维狭窄通道内泄漏流激振的稳定性。其中在周向流中忽略了扩压器的影响。计算结果与实验结果吻合较好，验证了泄漏流格式在偏心环形通道压力分布计算中的有效性，并发现在轴向平行和收敛通道中，作用于通道壁面的流体力为正恢复力，而在发散通道中，作用于通道壁面的流体力为负恢复力。颤振型不稳定性的临界速度的计算也与实验符合得很好。

项目成果

葉山 眞治: "二次元すきま流励起振動に関する研究" 日本機械学会論文集. (1992)

Shinji Hayama：“二维间隙流激发振动的研究”日本机械工程师学会会刊（1992）。

SHINJI HAYAMA: "A STUDY ON THE LEAKAGE-FLOW-INDUCED VIBRATIONS IN A TWO-DIMENSIONAL NARROW PASSAGE" TRNAS.OF JSME. (1994)

Shinji Hayama：“二维狭窄通道中泄漏流引起的振动的研究”TRNAS.OF JSME。

葉山眞治: "二次元すきま流励起振動" 日本機械学会論文集. (予定). (1994)

Shinji Hayama：“二维间隙流激发振动”日本机械工程师学会会议记录（计划）（1994 年）。

葉山眞治: "二次元すきま流励起振動に関する研究" 日本機械学会論文集. (予定). (1994)

Shinji Hayama：“二维缝隙流激发振动的研究”日本机械工程师学会论文集（计划）（1994）。

葉山 眞治: "二次元すきま流励起振動に関する研究" 日本機械学会論文集. (1993)

Shinji Hayama：“二维间隙流激发振动的研究”日本机械工程师学会会刊（1993）。