【摘要】 该文依据流体力学原理,对加边板的抽气罩口的速度场分布进行了理论上的探讨,并得到了抽气罩口的速度场分布,这些结果与Dalla—Valle的实验结果吻合性较好,为了便于应用,又将其结果进行了拟合,得到了加边板的抽气罩口的速度分布解析式,该式含有两个座标参数,是用曲面逼近实际等速面,而Dalla——Valle的牛经验公式是用平面代替实际等速面。更多还原

【Abstract】 In the light of the principle of fluid mechanics, this article inquires into the distribution of velocity field of air-extracting cover opening with a side board theoretically, and has obtained the distribution of velocity field at the o-pening of the cover.These results tally comparatively well with Dalla-Valle’s experimental results.For the convenience of application, the article makes these results be identical with each other so that an analytic formula of the velocity field di-stribution at the opening of the cover with a side board can be obtained, which contains two coordinate parameters. And they use the curve surfaceto approach the practieal equal speed surface. While the practical equal speed surface is replaced with a plane surface in the Dalla-Valle’s half experimental formula.更多还原