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A Fluid Dynamic Study of Gas Bearing for High Speed Mini-Scale Turbo Machinery

高速微型涡轮机械气体轴承的流体动力学研究

基本信息

批准号：
16206021
负责人：
HARA Kazuo
金额：
$ 31.37万
依托单位：
KYUSHU UNIVERCITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Research was carried out from the points of view of three terms, which were a flow analysis of gas bearing by way of numerical approach, low speed experimental investigation of scale up model. and heat transfer investigation of air for mini-scale passage.The numerical investigation was executed for a spindle of 31.8mm diameter,45mm length and radial clearance of 20μ for rotational speed of 10,000,50,000 and 100,000 rpm. Numerical result showed a conventional relationship between non-dimensional load coefficient and bearing number, which represented load capability and rotational speed respectively. Air flowed in and out through the shaft end clearance due to the pressure distribution inside the bearing and was found to contribute to the cooling of the bearing.A specification of test stand for low speed model test was based on the numerical result. The spindle was designed as 144mm diameter, 100mm length and 0.12mm radial clearance and was driven by an electric motor with static type pr … More essurized bearing. The peripheral velocity of the spindle was 7.5m/s for maximum rotational speed of 1,000 rpm in the experiment. Three high frequency pressure transducer were installed in three axial points of the spindle and the pressure distribution in the peripheral direction of the bearing was measured by phase locked sampling system to decide a bearing number and non-dimensional load coefficient. The non-dimensional load coefficient decreased due to the leakage of air according to the pressure distribution. A seal of leakage air was considered to be important for practical application.A steep peripheral pressure gradient was created due to the strong shear in the journal bearing. The pressure gradient gave significant effect on the heat transfer characteristics. At the inlet portion of the mini-scale channel of about 1 mm diameter, it was found that heat transfer was greatly enhanced. The heat transfer performance was equivalent to the impingement heat transfer, which was well known to have a high heat transfer performance. Less

本文从三个方面进行了研究，即气体轴承流动的数值分析、低速缩比模型试验研究。对直径为31.8mm、长度为45 mm、径向间隙为20μ m的主轴在转速为10，000、50，000和100，000 rpm时进行了数值研究。数值结果表明，无量纲载荷系数与轴承数（分别代表承载能力和转速）之间存在常规的关系。研究结果表明，由于轴承内部压力分布的影响，空气通过轴端间隙流入和流出，有助于轴承的冷却。主轴直径为144 mm，长度为100 mm，径向间隙为0.12mm，采用电动机驱动，静压式压力机 ...更多信息润滑轴承在实验中，主轴的圆周速度为7.5m/s，最大转速为1，000 rpm。在主轴的三个轴向点安装三个高频压力传感器，利用锁相采样系统测量轴承周向压力分布，确定轴承个数和无因次载荷系数。根据压力分布，无量纲载荷系数由于空气泄漏而降低。泄漏气体的密封在实际应用中具有重要意义。由于径向滑动轴承中的强烈剪切，产生了陡峭的周向压力梯度。压力梯度对换热特性有显著影响。在直径约为1 mm的微型通道的入口部分，发现传热大大增强。其传热性能与冲击传热相当，而冲击传热具有很高的传热性能。少

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Unsteady three-dimensional flow phenomena due to breakdown of tip leakage vortex in a transonic axial compressor rotor

DOI：
10.1115/gt2004-53745
发表时间：
2004
期刊：
影响因子：
0
作者：
Kazutoyo Yamada;M. Furukawa;T. Nakano;M. Inoue;K. Funazaki
通讯作者：
Kazutoyo Yamada;M. Furukawa;T. Nakano;M. Inoue;K. Funazaki

Experimental Investigation of Heat Transfer in Square and Circular Minichannel Air Flow for Wide Range of Pressure Ratio

宽压比范围方圆微通道气流传热实验研究

DOI：
发表时间：
2005
期刊：
Proceedings of ICMM2005, 3rd International Conference on Microchannels and Minichannels
影响因子：
0
作者：
Kazuo HARA;Masato FURUKAWA;Naoki AKIHIRO
通讯作者：
Naoki AKIHIRO

ヘリングボーン型溝付き動圧型気体軸受の内部流動解析

人字形沟槽动压气体轴承内部流动分析