CAJ | 학술논문

该实验在底部设有进气口的模拟仓内装满玉米后，埋入3列5排N2传感器，充N2流速为5 L/min，时间约40 min，室内温度25℃，关闭N2后连续测定氮气浓度至250 min，以研究氮气扩散规律。结果表明：充气阶段，第1列各点在19 min内氮气浓度全部达到饱和值（100%），1#点仅仅用时4 min，上升速度最快；关闭氮气后，1#点氮气浓度下降速度也最快。由距离-浓度模型可知，在充气阶段第1列点，距离进气口越近，浓度越高；而第2列、第3列各点的氮气浓度正好与之相反。在关闭气源后第1列点，距离进气口越近，浓度值越低。由时间-浓度模型可知，第1列的点距离进气口越近，浓度值变化越快；第2、3列的点，距离进气口越近，浓度值变化越慢。越靠近进气口的横排，点与点之间的浓度差别越大；距离进气口较远的点，不同横排上的浓度越接近。分析纵横方向上与进气口等距离的点，得出N2向纵向扩散的速度极显著高于横向。
해실험재저부설유진기구적모의창내장만옥미후，매입3렬5배N2전감기，충N2류속위5 L/min，시간약40 min，실내온도25℃，관폐N2후련속측정담기농도지250 min，이연구담기확산규률。결과표명：충기계단，제1렬각점재19 min내담기농도전부체도포화치（100%），1#점부부용시4 min，상승속도최쾌；관폐담기후，1#점담기농도하강속도야최쾌。유거리-농도모형가지，재충기계단제1렬점，거리진기구월근，농도월고；이제2렬、제3렬각점적담기농도정호여지상반。재관폐기원후제1렬점，거리진기구월근，농도치월저。유시간-농도모형가지，제1렬적점거리진기구월근，농도치변화월쾌；제2、3렬적점，거리진기구월근，농도치변화월만。월고근진기구적횡배，점여점지간적농도차별월대；거리진기구교원적점，불동횡배상적농도월접근。분석종횡방향상여진기구등거리적점，득출N2향종향확산적속도겁현저고우횡향。
Filling the corns in the stimulate barn with a inlet in the bottom,the N2 detectors were embedded in the barn with 3 row and 5 line. The nitrogen flow rate was 5L/min,charging time was about 40min,room temperature was 25℃,we measure the nitrogen concentration for 250 min after N2 flow closed. The result showed:in the Inflatable phases,the nitrogen concentration of the first row reaches a saturation value(100%)in the 19min,the time of 1# point was less than 4 min,which was the fastest one of all. After nitrogen was closed,1# points declined the fastest,too. The distance-apparent density model showed,when points in the first row were in the phase of gas filled,the closer the distance from the inlet was,the higher the concentration value became;After the nitrogen closed, the first row of the other 2 both showed:the closer the distance from the inlet was,the lower the concentration value became. The time-apparent density models showed,the first row,the closer the distance from the inlet was,the faster the concentration changed;the second and third rows,the closer the distance from the inlet was,the slower the concentration changed,the closer the distance from the inlet was,the greater the concentration difference between points will be;the farther the distance from the inlet was,the smaller the concentration difference between points will be. The data of points in all directions with the same distance to the inlet were analyzed and found,the concentration of longitudinal points changed more significantly than the lateral points.