圆管长径比和压力比对圆管出口和入口处气体流分布的影响

THE EFFECT OF THE LENGTH-RADIUS AND THE PRESSURE RATIO ON GAS ELOW PATTERNS AT THE EXIT AND ENTRANCE OF CYLINDRICAL TURES

Clausing和Dayton在假设管道出口压力为零条件下,讨论了圆管出口和入口处的气流分布情况。作或根据文献认为,在实际情况下,管道两侧的压力通常都不为零,提出了当管道两侧存在压力比时,计算圆管出口和入口处气流分布的一般公式。本文在文献基础上,给出在分子流条件下圆管长径比(L/r)与管道两侧压力比(P_i/P_2)的关系,从而进一步讨论圆管长径比和压力比对圆管出口和入口处气体流分布影响。

Clausing and Dayton discussed the gas flow patterns at the exit and entrance of cylindrical tubes while assuming a zero pressure at the tube exit. In the reference, author presented the general formulae for calculating the gas flow patterns at the exit and entrauce of cylindrical tubes when there exists a certain pressure at the tude exit, because the pressures in both sides of a tube are not usually equal the zero in practice. On the basis of the reference, the effect of the length-radius ratio (L/r) and pressure ratio (P_1/P_2) on gas flow patterns at the exit and entrance of cylindrical tubes has been discussed in this paper.