A semi-empirical equation to predict filling wall pressures on oblique conical hoppers

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2022-09-26 DOI:10.31545/intagr/152675

E. Gallego, J. Fuentes, F. Ayuga

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Abstract

. Hoppers are frequently used in steel silos, especially in farm facilities and food industries. These structures occasionally have an oblique hopper with an eccentric outlet to improve the flow of material during discharge. The 2006 version of the European standard EN 1991-4 uses classical Walker theory to predict wall pressures on concentric hoppers, but oblique hoppers are not considered. The authors have developed a Finite Element Model to predict the wall pressures on oblique hoppers and several sensitivity analyses have been made to study the possible influence of different parameters including outlet eccentricity, the outlet cir cumferential position, the aspect ratio of the silo and hopper, and different stored materials. The results show that the circumferential location and eccentricity of the outlet are the main factors affect ing the pressures on oblique hoppers. A semi-empirical equation is proposed to estimate the expected pressures on oblique hoppers which is designed to match with the maximum normal pressure obtained from the simulation, and to provide a good representation for the circumferential distribution of normal pressures. The results of this research may be of interest with regard to the upcoming revised version of the European standard EN 1991-4.

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斜锥漏斗充填壁压力的半经验方程

。料斗经常用于钢筒仓，特别是在农业设施和食品工业。这些结构偶尔有一个斜料斗与偏心出口，以改善物料在排出过程中的流动。2006年版本的欧洲标准EN 1991-4使用经典的沃克理论来预测同心料斗的壁压，但不考虑斜料斗。建立了斜料斗壁压有限元模型，并对斜料斗壁压进行了敏感性分析，研究了出口偏心率、出口圆向位置、料仓与料斗长径比以及不同物料对斜料斗壁压的影响。结果表明，出口的周向位置和偏心是影响斜料斗压力的主要因素。提出了一个估算斜料斗期望压力的半经验方程，该方程与模拟得到的最大法向压力相匹配，并能很好地表示法向压力的周向分布。这项研究的结果可能与即将修订的欧洲标准en1991 -4有关。

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.