氧氮混合气体在梯度磁场中流动的数值模拟  

Simulation of Air Flow in Gradient Magnetic Field

作　　者：李正强[1] 王立[1] 蔡军[1] 吴平[2] 尚晓航[3] 

机构地区：[1]北京科技大学机械学院,北京100000 [2]北京科技大学应用科学学院,北京100000 [3]北京联合大学信息学院,北京100080

出　　处：《中国民航学院学报》2005年第3期32-36,共5页Journal of Civil Aviation University of China

基　　金：国家教育部科技重点项目(00020);北京科技大学科技发展基金项目(20040600290).

摘　　要：用直接蒙特卡洛方法模拟了空气气流在梯度磁场中的氧浓度分布,利用DSMC模型将分子的碰撞和运动解耦,同时将磁场力简化为瞬间作用力,并对模拟结果进行了分析和对比。模拟表明,磁场强度与梯度乘积由100T2/m增加到800T2/m时,氧浓度由0.762%增加到3.1%;而当温度由0℃升高到100℃时,氧浓度由0.78%减小到0.25%。另外,随着压力的变化氧浓度存在一个最大值,在模拟条件下,这个最大值出现在0.05MPa(绝对压力)附近。An oxygen concentration distribution in the air flow in a gradient magnetic field is simulated with the method. The collisions and movements of molecules are uncoupled and the magnetic force is simplified as an instantaneous force. The results of the simulation are analyzed and compared with the experimental ones. They indicate that the oxygen concentration increases from 0.762% to 3.1% while the product of B and dB increasing from 100 T2/m to 800 T 2/m,or decreases from 0.78% to 0.25% while the temperature rising from 0 ℃ to 100 ℃. And there is a maximum of oxygen concentration while pressure varies,the maximum appears at about 0.05 MPa (absolute pressure) under stimulated conditions.

关 键 词：梯度磁场 DSMC 空气流动 计算机模拟 

分 类 号：O552.1[理学—热学与物质分子运动论]