【摘要】 在将具有负压通风系统的密闭式鸡舍内的空气流动简化为二维不可压无粘无旋理想流问题的基础上,分别建立了以流函数和速度势函数表示的流体运动方程。根据能量变分原理,导出了3～9节点平面单元的有限元方程。重点研究了舍内存在障碍物(如鸡笼和鸡体)时的气流分布问题。通过实例计算,比较了横向通风和纵向通风的气流分布型式的差异。更多还原

【Abstract】 Airflow in a confinement poultry house with negative-pressure ventilation system is simplified as a 2-dimentional ,inviscid and incompressible ideal fluid flow problem in order to illustrate airflow distributions.Based on the simplification,air movement equations are es- tablished by using the stream function and velocity potential function.A finite element equa- tion with 3--9 nodes of plane elements is then deduced.The airflow distribution affected by obstacles(such as stacked-cages and chicken bodies) is specially studied.The differences in airflow ’distributions for cross ventilation and tunnel ventilation systems are compared through the numerical computations to practical examples.更多还原