Abstract: Referring to the specificities of the flow field with anisotropic property,the group theory of particles is used and the general constitutive equation of Reynolds stress proposed by Shih is introduced to build a realizable algebraic stress model. The diffusion theory of vortex is also used in the model to set up the diffusion equation of gas, and the barrier caused by the variation of flow patterns inside the flow field is resolved. With the numerical model, the characteristics of the “cold state” flow field in the quench chamber of coal slurry gasifier are predicted. The relations of the maximum descending depth and void ratio of gas with outlet momentum are further discussed.

Key words:

气液两相流, 应力代数模型, 双流体模型, 逆压力梯度, 浮力流动, 水煤浆气化

摘要： 综合逆压突扩流动和浮力各向异性的流场特征，运用颗粒群理论，引入Shih的Reynolds应力通用本构关系建立了可实现性应力代数模型.在模型中引入涡扩散理论建立了扩散方程，解决了气液两相数值模拟中流型变化带来的复杂问题.运用该模型对气化炉洗涤室内流场进行了数值预报，并进一步量化分析了出口动量与最大下降深度和夹层内侧出口含气率的关系.

关键词:

气液两相流, 应力代数模型, 双流体模型, 逆压力梯度, 浮力流动, 水煤浆气化