糙米堆积特性与断流残留规律研究OA

Flow interruption,ledge residue,and repose behavior during grain discharge through a channel were studied using medium-to-late japonica brown rice.Preliminary tests evaluated 100 g and 200 g loads;one 200 g batch of undried rice was discharged four consecutive times.The formal experiment used rice dried to 7.25％moisture.Three fresh lots were tested,each with a 200 g load and a 0.38 g feeding compensation.A 100 g load failed to form a complete pile,so 200 g was adopted.Reusing the undried rice four times increased the repose angle from 34.06° to 35.77°(Spearman r=1.000,p=0.000),ledge residue from 0.36 g to 0.64 g,and total flow interruption time from 0.942 s to 6.396 s.For dried rice,the mean repose angle was 35.15°(CV 0.67％),with a normal distribution(Shapiro Wilk p=0.645),showing excellent reproducibility.Ledge residue averaged 0.49 g(CV 3.08％).Flow interruption time ranged from 0.138 s to 4.667 s,yielding a CV of 128.37％.This wide variation stems from the inherent randomness of the arching effect.The repose angle,however,remained stable(CV 0.67％),indicating that discharge instability hardly affects the angle measurement.A 0.38 g feeding compensation largely offsets the systematic bias caused by ledge residue.These findings provide a reference for optimizing storage handling of mediumtolate japonica brown rice.