粮堆通风阻力的研究方法及阻力模型研究进展

粮食储存过程中,干燥和通风是重要的单元操作。对粮堆进行强制通风,可以干燥或冷却粮堆,调节粮堆的温度和水分。探究气流通过粮堆的流动和压力分布规律、计算粮堆通风阻力是科学设计通风系统的关键之一。本文简要地介绍了国内外研究储粮通风流动和阻力的方法,重点综述了国内外通风阻力的理论、半理论和经验模型,分析了各种模型的优缺点,探讨了影响通风阻力的各种因素,可以为储粮通风阻力的研究、通风系统的设计和优化提供借鉴。

RESEARCH APPROACHES AND EQUATIONS OF RESISTANCE OF BULK GRAIN TO AIRFLOW- A REVIEW

Drying and aeration are important unit operations during grain storage . Drying or cooling is done by forcing air through the grains to remove high moisture and temperature gradients within the bulk grain . T he foundation of an efficient drying / aeration system depends on the proper understanding and calcula‐tion of the resistance to airflow through bulk grain or the airflow distribution and pressure drop character‐istics of grain beds . In present paper ,the research approaches of resistance of bulk grain to airflow were briefly introduced ,the theoretical ,semi-theoretical ,and empirical models relating pressure drop to airflow were reviewed ,and effects of process parameters on the resistance of bulk grain to airflow were discussed . Research work in this field would facilitate design of efficient drying/ aeration systems with appropriate configurations ,prediction of equipment performance and process optimization .