固定床烘干设备匀风系统结构优化与验证
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摘要
针对花生荚果固定床干燥设备风道内流场分布不均匀的问题,提出了一种基于流体力学的结构优化方案。通过在烘干箱风道内加装一定数量的匀风挡板,可有效提高风道内风量分布的均匀程度。依据烘干现场的机型,构建三维几何模型,测得箱内27个测点的模拟值与实际测量值均方根误差为0.163m/s,最大绝对误差为0. 46 m/s,验证了分析模型的准确性。根据不同的优化方案模拟了27种改造后的烘干箱内流场分布情况,得出最优组合方案:在6m长的烘干箱内加装6块长度为1m、板间距1m,将风道均匀划分的匀风挡板,对比改造前后的气流不均匀系数降低了49.44%。该试验结果可为固定床烘干设备风道均匀性的研究及优化提供参考。
In order to solve the problem of non-uniform distribution of the flow field in the air ducts of fixed-bed drying equipment for peanuts,a structural optimization scheme based on fluid dynamics was proposed. By adding a certain number of uniform baffles in the air duct of the drying box,the uniformity of air volume distribution in the air duct can be effectively improved. According to the model of the drying site,a three-dimensional geometric model was constructed. The root mean square error of the measured value and the actual measured value of the 27 measuring points in the box was 0.163 m/s,and the maximum absolute error was 0.46 m/s. The accuracy of the analytical model was verified,and the distribution of the flow fields in 27 types of reconstructed drying boxes was simulated according to different optimization schemes. The optimal combination scheme was obtained: 6 pieces of length were installed in the 6-m-long drying box.1 m,plate spacing 1 m,evenly dividing the air duct uniform baffle. The field test showed that the non-uniform coefficient of airflow before and after the contrast transformation decreased by 49.44%. The test results can provide reference for the study and optimization of the duct uniformity of the fixed bed drying equipment.
In order to solve the problem of non-uniform distribution of the flow field in the air ducts of fixed-bed drying equipment for peanuts,a structural optimization scheme based on fluid dynamics was proposed. By adding a certain number of uniform baffles in the air duct of the drying box,the uniformity of air volume distribution in the air duct can be effectively improved. According to the model of the drying site,a three-dimensional geometric model was constructed. The root mean square error of the measured value and the actual measured value of the 27 measuring points in the box was 0.163 m/s,and the maximum absolute error was 0.46 m/s. The accuracy of the analytical model was verified,and the distribution of the flow fields in 27 types of reconstructed drying boxes was simulated according to different optimization schemes. The optimal combination scheme was obtained: 6 pieces of length were installed in the 6-m-long drying box.1 m,plate spacing 1 m,evenly dividing the air duct uniform baffle. The field test showed that the non-uniform coefficient of airflow before and after the contrast transformation decreased by 49.44%. The test results can provide reference for the study and optimization of the duct uniformity of the fixed bed drying equipment.
引文
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[23]姚家君,郭彬彬,丁为民,等.基于鹅舍气流场CFD模拟的通风系统结构优化与验证[J].农业工程学报,2017,33(3):214-220.
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[26]李莉,刘永前,杨勇平,等.基于CFD流场预计算的短期风速预测方法[J].中国电机工程学报,2013,33(7):27-32,22.
[27]邓书辉,施正香,李保明,等.低屋面横向通风牛舍空气流场CFD模拟[J].农业工程学报,2014,30(6):139-146.
[2]那雪姣,刘明国,张文,等.机械脱壳时花生仁损伤特征及规律[J].农业工程学报,2010,26(5):117-121.
[3]吕金虎,赵春芳,李金成.热泵干燥技术在农副产品加工中的应用与分析[J].农机化研究,2010,32(1):212-217.
[4]山长坡,刁恩杰,王宇晓,等.臭氧降解花生中黄曲霉毒素的设备及应用[J].农业工程学报,2012,28(21):243-247.
[5]王叶群,杨增玲,张绍英,等.用于污染黄曲霉毒素花生分选的荧光信号研究[J].农业工程学报,2016,32(1):187-192.
[6]魏海,谢焕雄,胡志超,等.花生荚果气力输送设备参数优化与试验[J].农业工程学报,2016,32(2):6-12.
[7]王海鸥,胡志超,陈守江,等.收获时期及干燥方式对花生品质的影响[J].农业工程学报,2017,33(22):292-300.
[8]于贤龙,高振江,代建武,等.苜蓿气体射流冲击联合常温通风干燥装备设计及试验[J].农业工程学报,2017,33(15):293-300.
[9]马中青,叶结旺,赵超,等.基于下吸式固定床的木片气化试验[J].农业工程学报,2016,32(S1):267-274.
[10]师建芳,吴中华,刘清,等.不同进风方案下隧道烘干窑热风流场CFD模拟和优化[J].农业工程学报,2014,30(14):315-321.
[11]宁国鹏,王德成,王光辉,等.苜蓿干燥与茎叶分离设备设计与CFD模拟[J].农业机械学报,2011,42(1):84-89,133.
[12]任海伟,李金平,刘增光,等.太阳能干燥室内部气流场分布CFD数值模拟![J].农业机械学报,2012,43(S1):235-238.
[13]金珍,万龙.一类流体动力方程周期解的存在性和唯一性[J].浙江大学学报:理学版,2017,44(1):40-46,56.
[14]吴宏伟.可压缩磁流体动力方程解的正则性[J].数学物理学报,2010,30(3):593-602.
[15]石广丰,邢云飞,沈栋平.某型汽车水泵流体动力学仿真与试验[J].流体机械,2017,45(3):11-14,20.
[16]王超,谭鹤群.我国干燥技术的研究进展及展望[J].农机化研究,2009,31(12):221-224,227.
[17]王会林,卢涛,姜培学.生物多孔介质热风干燥数学模型及数值模拟[J].农业工程学报,2014,30(20):325-333.
[18]高莹,金陶胜,赵彦琳,等.基于多孔介质模型的土壤风蚀风洞湍流涡发生器设计的数值模拟[J].农业工程学报,2011,27(11):85-89.
[19]吴沿友,郭晓君,付为国,等.红树林多孔介质阻力模型与消波效果仿真分析[J].农业工程学报,2012,28(23):92-97,295.
[20]陶满,张志红,姬江涛,等.牡丹籽微波干燥特性研究[J].农机化研究,2017,39(9):249-253.
[21]孙国祥,李永博,汪小旵,等.背负式喷雾器雾滴分布特性的CFD模拟与试验[J].农业工程学报,2012,28(20):73-79.
[22]杨先亮,宋蕾娜,靳光亚.热泵干燥系统的热力学分析[J].农机化研究,2009,31(4):200-203.
[23]姚家君,郭彬彬,丁为民,等.基于鹅舍气流场CFD模拟的通风系统结构优化与验证[J].农业工程学报,2017,33(3):214-220.
[24]陈有庆,胡志超,胡良龙,等.喷雾干燥过程的数值模拟[J].农机化研究,2008(10):37-39,43.
[25]何媛,南晓红.三维CFD模型预测热压作用下冷库门的冷风渗透率[J].农业工程学报,2008,24(6):26-30.
[26]李莉,刘永前,杨勇平,等.基于CFD流场预计算的短期风速预测方法[J].中国电机工程学报,2013,33(7):27-32,22.
[27]邓书辉,施正香,李保明,等.低屋面横向通风牛舍空气流场CFD模拟[J].农业工程学报,2014,30(6):139-146.