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

基本信息

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

项目摘要

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

关于几毫米和50毫米的叶轮直径作为迷你泵，该研究项目旨在发展具有高性能和适用性的迷你泵的流体动力学基础。为了实现目标，我们在实验和数值上研究了以下提议的设计概念的有用性和有效性：（1）选择泵的较高驾驶速度（2）选择半开放型斜体（不带有前罩）（3）选择的刀片和叶片数量更大的刀片范围（4）较大的Extey Engle extey extey offog Enger Elbel'的研究效果较少，而不是1 fros offog Enge of the Ingem grom grom of extey offog Enger Elboh Easter'' ：1。可以澄清的是，迷你涡轮机的内部效率大于60％。注意，此值大于各种教科书中所示的值2。实验结果表明，滑动因子的值大于0.9，并且u…可能会提供更大的功率输入。在泵特性中观察到相似性定律，其旋转速度大于4,000 rpm。这个速度对应于雷诺数为1.2×10^5，这几乎与文献中所示的描述一致。从雷诺数效应的角度来看，高速泵对于迷你尺寸是可取的，而且还减少了机械密封的损失分数4。结果表明，基于Reynolds平均Naiver Stokes方程的数值湍流分析具有K-ω湍流模型将合理地适用于研究迷你叶轮的氢能性。5。分析可令人满意地预测叶轮尖端和壳体壁之间轴向间隙对氢能性能的影响。6。从泵出口到结果的旁路方法在某种程度上可以改善低流量区域的不稳定Q-H曲线。7。尽管目前的测试结果表明，封闭叶轮的泵效率（带有裹尸布）比半开的叶轮（带有裹尸布）更好，但预计进一步的研究将合理地解释它们。8。从目前的实验和数值研究中证实，即使我们选择了几乎相同的特异性速度和直径，水解性能包括轴向清除效果在设计方法上也会大不相同。较少的