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静压轴承节流孔出口斜坡对压力陡降现象的抑制
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Suppression Effect of Slope under the Orifice on Drastic Pressure Depression Phenomenon of Aerostatic Bearing
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    摘要:

    在一定条件下,气体静压轴承在节流孔出口处会出现大幅度的压力降低现象,这降低了轴承的承载能力与刚度。高速气流从节流孔中喷射而出,在平面的阻挡下迅速转向90°,这使得气流在拐角处速度进一步提高,进而导致了压力的降低。为提高气体静压轴承的静态特性,同时考虑静压轴承的加工性能,提出了在节流孔处加工斜坡的方法来抑制节流孔处的压力陡降现象。建立了单孔止推轴承的低雷诺数K-ε湍流模型,在CFD仿真的基础上,分析了不同倾斜角度下,轴承均压区的压力陡降比、承载特性与耗气量,并得到如下结论:节流孔出口处的斜坡能明显抑制压力陡降现象;节流孔出口斜坡的倾角小于6°时,倾角越大,其承载压力陡降比越小;随着倾角的增大,轴承的承载力增大,同时耗气量上升。

    Abstract:

    The aerostatic bearing has the phenomenon that the pressure of the orifice exit will be drastically reduce in certain conditions, and it reduces the capacity and stiffness of the bearing. When highspeed airflow shot out from the orifice, it will turn 90 degrees quickly because of the plane bar, which makes the airflow speed further improved at the corner and leads to the lower pressure. In order to improve the static characteristics of aerostatic bearing, at the same time considering the processing performance of hydrostatic bearing, the method is put forward of processing the slope in orifice to suppress the drastic pressure depression phenomenon. The low Reynolds number Kε turbulence model of singlearch thrust bearing was first established. And the steep fall ratio, loadbearing characteristics and gas consumption were analyzed in the bearing pressure equalizing area with the different angles on the basis of the CFD simulation. The conclusion are obtained as follows: the orifice exit ramp angle can obviously supress drastic pressure depression phenomenon; when the orifice exit ramp angle is less than 6 degrees, the greater the angle, the smaller is the steep fall ratio of the loading pressure; with increasing of the ramp angle, the greater the bearing capacity, the greater is the gas consumption at the same time.

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王波,吴言功,薛家岱,乔政,刘广润.静压轴承节流孔出口斜坡对压力陡降现象的抑制[J].机床与液压,2017,45(13):121-124.
. Suppression Effect of Slope under the Orifice on Drastic Pressure Depression Phenomenon of Aerostatic Bearing[J]. Machine Tool & Hydraulics,2017,45(13):121-124

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  • 在线发布日期: 2017-07-31
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