軸流式血泵(Axial Blood Pump)為目前淡江大學發展之左心室輔助器(LVAD)所採用的驅動機構。本研究係採用實驗之方式量測現有軸流式血泵之性能曲線(performance curve)與沿著此輔助器之靜態邊壁壓力分佈(static wall pressure distribution)。實驗結果發現此血泵在7000 rpm之轉速下，可提供100 mmHg之壓力提升與5 L/min之流量，與設計點的需求相符合。並利用流場可視化(flow visualization)之方法對血泵之上下游端做一個定性的觀測，在設計點與離點設計之狀況下在入流定子上游端之管壁附近發現環型區域之迴流流場，並在出流定子葉片尾端區域發現小區域之迴流流場。最後再利用二分量雷射都卜勒測速儀(Laser Doppler Velocimetry)對血泵上下游端之測試斷面做流體速度分佈與紊流強度(turbulence intensity)之初步分析。 An axial blood pump is a driving mechanism of Left Ventricular Assist Device(LVAD) developed by TKU. The performance curves and the static wall pressure distributions of the axial blood pump are measured in in-vitro experiments. The results show that, at 7000 rpm, the axial blood pump can provide 100 mmHg pressure rise and 5 L/min flowrate which matching the design point. The flow fields of the upstream and downstream of the blood pump are qualitively analyzed by using the method of flow visualization. At design and off-design conditions, an annular region of reverse flow was commonly observed near the housing wall before the inlet stator. A small recirculation cell was observed behind the outlet stator tail region at design condition. We also utilized Laser Doppler Velocimetry (LDV) to measure the fluid velocities and turbulent intensities at the cross-sections of the upstream and downstream of the pump.
