真空管道流导计算中平均压力取值的误差分析与计算方法  

Error analysis and calculation method of the average pressure in vacuum pipe flow conductance

作　　者：张以忱[1] 黄化岩[1] 张国庆[1] 李灿伦 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004 [2]上海卫星装备研究所,上海200240

出　　处：《真空》2013年第3期23-25,共3页Vacuum

摘　　要：真空管道的流导,又叫做通导能力。它是管道的重要性能参数,是设计真空系统时必须考虑的因素之一。在计算粘滞流管道流导时,流导跟管道内的平均压力有关,通常的方法是近似把管道入口压力作为管道平均压力。但是当管道较长、真空泵抽速较低或管道入口压力较小时,上述近似方法的误差就变大了。本文对粘滞流下管道的平均压力的取值进行了讨论,分析了近似取管道高压端压力为平均压力时所产生的误差,并提供了粘滞流下管道的平均压力的计算方法等。The conductance of the vacuum pipeline, known as the conducting capability, is an important performance parameter. It is one of the factors that must be considered in the design of vacuum system. In the calculation of the viscous state, the pipe flow conductance is related to the average pressure in the pipe. The usual method is to approximate the inlet pressure as the average pressure of the pipeline. However, when the pipeline becomes longer, the pumping speed becomes lower or pipe inlet pressure becoms smaller, the error of this approximation method is larger. In this paper, the average pressure value of the viscous flow pipeline was discussed. The error produced by approximating the pipeline high pressure as the average pressure was analyzed and the methods of caleulating average pressure in viscous flow nioeline was provided.

关 键 词：真空系统 流导 粘滞流 误差分析 计算方法 

分 类 号：TH412[机械工程—机械制造及自动化] TB71[一般工业技术—真空技术]