不同形式导流屏导流效果数值模拟

导流设施可分为实体式和百页式2种类型。为了分析2种形式导流屏的导流效果,建立了飞机尾喷气流场的模型,分别模拟不同形式导流屏的导流效果。模型采用笛卡尔坐标系和结构网格,采用标准格式离散方程,采用SIMPLE算法来计算压力与速度的耦合。分析结果表明:设置导流屏导流效果明显,实体式屏若导流屏过高或过陡,并容易产生横溢气流;百页式导流屏让气流沿页板方向向后上方扩散,它对气流的阻力较实体屏小。

Numerical Simulation of Different Blast Fence Forms' Effect on Jet Flow Field

The blast fence can generally be divided into integral fence and louver fence. Based on the purpose of analyzing blast fence''s effect., the paper builts jet flow field model , simulated effect on jet flow field of different installation forms. Equation is scattered by standard format, and coupling of pressure and velocity use simple algorithm. The model applied Cartesian co-ordinates, and used structural grid. Simulation results indicate that blast fence''s effect is obvious. And if the integral fence is too high or too steep, it can produce abundant airflow. The louver fence make airflow spread towards the back and above along the blade, and its air resistance is lower than the other one''s.