结冰面水滴收集率欧拉计算方法研究及应用

Study on Eulerian method for icing collection efficiency computation and its application

发展了一套用欧拉法计算飞机结冰表面水滴收集率的算法。先用CFD方法计算空气场,在获得空气流场分布的基础上,求解水滴相控制方程,进而得到水滴收集率。空气相控制方程和水滴相控制方程均写成典型输运方程的形式,采用一致的有限体积法离散求解,方便了计算程序的编制。计算了典型条件下圆柱和NACA0012翼型的水滴收集率,得到了与实验或文献一致的结果,初步表明本文发展的有限体积算法以及相应的计算代码是有效的。最后给出了本文方法在三维复杂外形水滴收集率计算中的应用,对三段翼、T型尾翼的水滴收集率进行了计算,获得了相应的分布规律。

An Eulerian method to compute collection efficiency on icing surface is presented in the paper.The external flow field of gas phase is calculated with CFD method,based on which the governing equations of water droplet phase are solved,then the corresponding collection efficiency is obtained.Governing equations of gas and water are written in the form of transport equations.Both are solved with finite volume method,which make the development of numerical codes easier.Water droplet collection efficiency on a three dimensional cylinder and a NACA0012 airfoil are computed.The results agree well with data of experiments and references,which indicates that the method and numerical codes are valid.In the end,applications of the method to complex configuration are given.Collection efficiency on a three elements wing and the T tail of a feeder liner are computed.Then the distribution rules of impingement are yielded.