Analyses of the Unsteady Fluid Force on the Impeller of a Centrifugal Blood Pump

离心式血泵叶轮非定常流体力分析

• 批准号: 15360103
• 负责人: TSUKIYA Tomonori
• 金额: $ 5.38万
• 依托单位: Research Institute of National Cardiovascular Center
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360103/
• 关键词: Centrifugal Pump; Rotordynamic Force; Ventricular Assist Device; Unsteady Flow; ふれまわり; 流体力; インペラ; 軸受; 補助人工心臓; ふれまわり運動; 回転比

The present study deals with the analyses of the rotor-dynamic fluid force acting on the impeller of a miniature centrifugal pump developed as a left ventricular assist device. The final goals are to clarify the causes of the unstable problems on the impeller motion of a magnetically-coupled centrifugal pump and to present the design standards for vibration problems. The in-house blood pump originally designed as a left ventricular assist device was selected as the object pump. The displacement of the impeller was measured using two laser displacement meters to obtain the lateral loci of the impeller under the wide range of working conditions. The average position of the impeller shifted in the direction of the outlet port as the flow rates increased at the all investigated rotational speeds (1500 - 3000 rpm). The frequencies of the whirling motion of the impeller were between 0.7 and 0.5, and the rotational velocity components around the impeller bush was influential on the frequency of the whirling motion. This flow works also as the leakage flow, which is expected to wash the bottom area of the pump casing to avoid thrombus formation inside the pump. The practical operational conditions of the pump include flow fluctuation of a large-scale, which was caused by the beatings of the native heart of the patients. The impeller displacements were also measured under the pulsatile conditions by the use of pulsatile blood pump placed at the upstream of the test pump. The results showed no significant difference from the loci of the steady flow rate conditions.For the measurements of the rotordynamic fluid forces, a 7.5 time scale-up model of -the impeller was manufactured and tested under whirling motion. The results are that the unsteady forces are generated on the impeller with the open-blades without the shroud, and that unsteady force becomes steady at the frequency ratio of 0.7 to 0.8.

本文分析了一种用于左心室辅助装置的微型离心泵的叶轮所受的转子动态流体力。最终目的是阐明磁耦合离心泵叶轮运动不稳定问题的原因，并提出振动问题的设计标准。最初设计为左心室辅助器械的内部血泵被选为目标泵。利用两台激光位移计对叶轮的位移进行了测量，得到了叶轮在各种工况下的横向运动轨迹。在所有研究的转速（1500 - 3000 rpm）下，随着流速增加，叶轮的平均位置沿出口端口的方向移动。叶轮的涡动频率在0.7 ~ 0.5之间，叶轮衬套周围的转速分量对涡动频率有影响。该流动也作为泄漏流起作用，其预期冲洗泵壳的底部区域以避免泵内形成血栓。该泵的实际工作条件包括大范围的流量波动，这是由患者的自体心脏跳动引起的。在脉动条件下，通过使用置于试验泵上游的脉动血泵测量叶轮位移。为了测量叶轮的动水力，制作了一个放大7.5倍的叶轮模型，并在旋转运动下进行了试验。结果表明，无围带开式叶片叶轮产生非定常力，在频率比为0.7 ~ 0.8时，非定常力趋于稳定。

项目成果

ふれまわり運動下で遠心型血液ポンプ羽根車に作用するロータダイナミック流体力

旋转运动作用于离心式血泵叶轮的转子动流体力

• 发表时间: 2006
• 期刊: 日本機械学会論文集B編 (掲載予定)
• 作者: 鈴木隆起;Romain Prunieres;堀口祐憲;築谷朋典;妙中義之;辻本良信
• 通讯作者: 辻本良信

遠心型血液ポンプのインペラに作用する流体力におよぼすふれまわり現象の影響

涡流现象对离心式血泵叶轮流体力的影响

• 发表时间: 2004
• 期刊: 日本機械学会流体工学部門講演会講演概要集 04-25
• 作者: 築谷朋典;妙中義之;北村惣一郎;上窪真由子;堀口祐憲;辻本良信
• 通讯作者: 辻本良信

Whirling Motion of the Impeller of a Centrifugal Pump as a Ventricular Assist Device

作为心室辅助装置的离心泵叶轮的旋转运动

• 发表时间: 2006
• 期刊: Proc.The 3^<rd> International Symposium on Stability Control of Rotating Machinery
• 作者: Tsukiya T;Taenaka Y;Tsujimoto Y;Horiguchi H
• 通讯作者: Horiguchi H

ふれまわり運動中の遠心型血液ポンプ羽根車に作用する非定常流体力の測定

旋转运动过程中作用在离心式血泵叶轮上的非定常流体力的测量

• 发表时间: 2006
• 期刊: 第53回ターボ機会協会総会講演会論文集
• 作者: 鈴木隆起;友松健一;堀口祐憲;辻本良信;築谷朋典
• 通讯作者: 築谷朋典

The Rotodynamic Forces on an Artificial Heart Pump Impeller in Whirling Motion

旋转运动中人工心脏泵叶轮上的旋转动力

• 发表时间: 2006
• 期刊: Journal of the Japanese Society of the Mechanical Engineering, Series B (in press)
• 作者: Suzuki T;Prunieres R;Horiguchi H;Tsukiya T;Taenaka Y;Tsujimoto Y
• 通讯作者: Tsujimoto Y