通风过程中粮堆内热湿传递及霉变预测CFD研究  

CFD Study on Heat and Moisture Transfer and Mildew Prediction of Stored Grains in the Ventilation Process

作　　者：陈桂香[1] 王海涛[1] 张虎[1] 

机构地区：[1]河南工业大学土木建筑学院,郑州450001

出　　处：《中国粮油学报》2015年第7期85-90,共6页Journal of the Chinese Cereals and Oils Association

基　　金：863计划(2012AA101608);2014年粮食公益性行业科研专项(201413007)

摘　　要：建立了通风过程中粮堆内热湿传递控制方程,给出了粮堆的最大可能霉菌生长指数模型。利用CFD软件分析了通风过程中实际粮堆的热湿性能,预测了通风过程中实际粮堆的霉变情况,利用实际高大平房仓的监测数据验证了CFD模拟结果的正确性。结果显示,通风37 h,粮堆温度从16.69℃降为12.59℃,粮堆平均温度预测值与实测值之间的误差小于3%;粮堆初始温度为30℃时,通风28 h,粮食颗粒间空气相对湿度下降到临界空气相对湿度以下,通风38 h,粮堆的最大可能霉菌生长指数从2下降为0。Governing equations of heat and moisture transfer of stored grains were established in this paper through improving the governing equations of heat, mass and momentum in the CFD software. The largest possible mould growth index of stored grains was also established. CFD software was used to simulate heat and moisture processes and mildew predictions that oceured in real stored grains. Results of CFD simulation were validated by mo- nitoring data from a real large warehouse. Results of CFD simulation showed that average temperature of stored grains decreased from 16.69 ℃ to 12.59 ℃ after 37 h of ventilation of the big warehouse. Errors between predicted average temperature of stored grains and measured average temperature of stored grains were less than 3%. When initial tem- perature of stored grains was 30 ℃, relative humidity of air in stored grains was below the critical relative humidity after 28 h of ventilation of the big warehouse. Values of largest possible mildew growth index of the new grains de- creased from 2 to 0 after 38 h of ventilation of the big warehouse.

关 键 词：高大平房仓 霉菌污染 数值模拟 霉菌生长指数 临界相对湿度 

分 类 号：S226.6[农业科学—农业机械化工程]