双规小孔测试罩上室的蒙特卡洛分析

• 作 者: 徐廷伟 冯玉国
• 出 处: 真空
• 发表日期: 1980年05期
• 关键词: 蒙特卡洛 双规 余弦定律 角分布 轴向分布 下室 孔径范围 规管 理论分析 室壁

一、引言 迄今为止,在理论分析～〔1、2〕和实际应用当中,都假定双规小孔抽速测试罩上室(图1)内气体处于平衡状态,在罩壁上任意点都呈现平衡压强P,因此规管可随意搁置;通过隔板孔进入下室的气体分子的角分布遵从余弦定律。实际上,仅当上室为开有小孔的园球,气体从球心向四面八?

I. INTRODUCTION So far, in theoretical analysis [1,2] and practical applications, it has been assumed that the gas in the upper chamber (Figure 1) of the double-gauge orifice is in equilibrium with the test chamber and is balanced at any point on the enclosure wall Pressure P, so the regulation can be arbitrarily shelved; through the diaphragm hole into the lower chamber of the gas molecules angular distribution follows the law of cosines. In fact, only when the upper chamber is opened with a hole in the ball, the gas from the ball center to all directions?