APU舱引射排液出口速度的估算方法

The Estimation Method for the Outlet Velocity of APU Compartment Ejector Drainage System

APU舱引射排液是一种复杂的气液两相流混合过程。通过假设,获得了一种APU舱引射排液装置出口液体排放速度的一维估算方法,并根据该方法计算了地面和空中典型姿态下APU舱排液管出口的液体排放速度,这些计算结果可作为全机级APU舱排液路径数值模拟的输入条件。计算结果表明,引射排液可以有效增加排液管出口液体排放速度,而且APU舱排液管出口液体排放速度与飞行高度成反比。

The APU compartment ejector drainage is a kind of complex mixture flow with gas and fluid. A 1-D estimation method for the outlet velocity of APU compartment ejector drainage system is obtained based on proper assumption. The outlet velocities of APU compartment ejector drainage system on ground and typical status in flight are calculated according to the estimation method. The calculation results can be the input for CFD simulation of APU compartment drainage path at aircraft level. The calculation results show that the ejector effect in the APU compartment ejector drainage system can increase the fluid drainage velocity effectively, and the fluid drainage ve- locity is inversely proportional to the altitude.