Experiment Investigation of Proposed Design Concepts for a High Speed Mini Turbopump

高速微型涡轮泵拟议设计概念的实验研究

• 批准号: 11650179
• 负责人: NISHI Michihiro
• 金额: $ 2.43万
• 依托单位: KYUSHU INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650179/
• 关键词: Fluid Machinery; Turbopump; Mini Pump; Hydraulic Performance; Design Concepts; Impeller; Performance Test; Clearance; ポンプ; 性能

Regarding those turbo-pumps of impeller diameter between several millimeter and 50 mm as mini size pumps, this research project aims to develop the hydrodynamic basis of a mini pump having high performance and applicability. To achieve the objective, we have studied the usefulness and effectiveness of the following proposed design-concepts experimentally and numerically :(1) Selection of higher driving speed of pump(2) Selection of semi-open type impeller (without front shroud)(3) Selection of greater number of blades and blade exit-angle(4) Selection of exit-to-inlet area ratio of impeller less than 1From two years' research work, the following major conclusions are obtained :1. It is clarified that a mini turbopump having the internal efficiency greater than 60 % is possible. It is noted that this value is greater than that shown in various textbooks.2. Experimental results indicate that the slip factor takes the value larger than 0.9 and the greater power input will be possible by u … More se of the present design concepts for mini pump.3. The similarity law is observed in the pump characteristics for a rotational speed greater than 4,000 rpm. This speed corresponds to the Reynolds number being 1.2 × 10^5, which almost agrees with the description shown in the literatures. Thus, a high speed pump is desirable for the mini size from the viewpoints of not only the Reynolds number effects but the reduction of loss fraction of mechanical seal.4. It is shown that the numerical turbulent flow analysis based on Reynolds Averaged Naiver Stokes equations with k-ω turbulence model will be reasonably applicable to study the hydraulic performance of mini impeller.5. The effect of axial clearance between the impeller tip and the casing wall on the hydraulic performance is satisfactorily predicted by the analysis.6. The bypass method to return some amount of flow from the exit of the pump to the suction pipe is usable to some extent to improve unstable Q-H curve in the low flow region.7. Though the present test results showed that the pump efficiency of closed impeller (with shroud) was better than that of semi-open impeller (without shroud), the further study is expected to explain them reasonably.8. It is confirmed from the present experimental and numerical study that the hydraulic performances including the axial clearance effect will be varied greatly depending on design methods, even if we selected the nearly identical specific speed and diameter. Less

本课题以叶轮直径在几毫米至50毫米之间的涡轮泵为小型泵，旨在开发高性能、适用性强的小型泵的水动力基础。为了实现这一目标，我们通过实验和数值研究了以下提出的设计理念的实用性和有效性：(1)选择较高的泵驱动转速(2)选择半开式叶轮（无前叶冠）(3)选择较大的叶片数量和叶片出口角(4)选择叶轮出口进口面积比小于1。阐明了内部效率大于60%的小型涡轮泵是可能的。值得注意的是，这个值比各种教科书中显示的值要大。实验结果表明，滑移系数大于0.9，可以实现更大的功率输入。在转速大于4,000 rpm的泵特性中观察到相似定律。这一速度对应的雷诺数为1.2 × 10^5，与文献中的描述基本一致。因此，无论是从雷诺数效应的角度还是从减小机械密封损失的角度来看，小尺寸泵都需要高速泵。结果表明，基于k-ω湍流模型的Reynolds平均naver - Stokes方程的数值湍流分析将合理适用于研究微型叶轮的水力性能。分析结果较好地预测了叶轮顶端与机匣壁之间的轴向间隙对水力性能的影响。采用旁通方式将泵出口处的一定流量回流到吸入管中，可在一定程度上改善低流量区不稳定的Q-H曲线。虽然目前的试验结果表明封闭式叶轮（带叶冠）的泵效率优于半开式叶轮（不带叶冠），但希望进一步的研究能够合理地解释这一点。本文的实验和数值研究证实，即使选择几乎相同的比转速和直径，不同的设计方法，包括轴向间隙效应在内的水力性能也会发生很大的变化。少

项目成果

Shuhong LIU: "A Study on a High Speed Mini Turbopump 2nd. Rep. : Effect of Bypass Flow on the Pump Performance"Proceedings of 2nd International Symposium on Fluid Machinery and Fluid Engineering. 633-636 (2000)

刘书红：“高速微型涡轮泵的研究第二次报告：旁路流量对泵性能的影响”第二届国际流体机械与流体工程研讨会论文集。

LIU Shuhong: "Impeller Geometry Suitable for Mini Turbo-pump"Proceedings of ASME FEDSM'01. 318. 18238/1-8 (2000)

刘书红：《适合微型涡轮泵的叶轮几何形状》ASME FEDSM01论文集。

LIU Shuhong: "A Study on a High Speed Mini Turbopump (2nd Rep : Effect of By pass Flow on the Pump Performance)"Proceedings of 2nd Int.Symp.on Fluid Machinery and Fluid Engng.. 633-636 (2000)

刘书红：“高速微型涡轮泵的研究（第二次报告：旁路流量对泵性能的影响）”第二届流体机械与流体工程国际会议论文集. 633-636 (2000)

西道弘: "高速・ミニターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 4. 34-39 (2000)

西道宏：“高速微型涡轮泵的性能研究”九州工业大学S.V.B.L年报4. 34-39 (2000)。

西道弘: "高速ミニターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 4. 34-39 (2000)

西道宏：“高速微型涡轮泵的性能研究”九州工业大学S.V.B.L年报4. 34-39 (2000)。