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Study of Swirling Flow Pneumatic Conveying System

旋流气力输送系统的研究

基本信息

批准号：
03650152
负责人：
TOMITA Yuji
金额：
$ 1.34万
依托单位：
KYUSHU INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650152/
关键词：
Multiphase Flow Swirling Flow Guide Vane Pneumatic Conveying System Swirl Number Pressure Drop Low Air Velocity Numerical Simulation 鉛直管流動様式輸送限界粒子間衝突 k-2モデル水平管スワ-ル数入口区間粒子速度付加圧力損失

项目摘要

A swirling flow pneumatic conveying system for granular particles is investigated both for horizontal and for vertical pipelines. The pipelines consist of 80mm inside diameter tubes and the length is about 12m. The swirling flow is generated by using axial guide vanes of different flow angle and is found to be characterized by a swirl number for gas flow. An empirical procedure is given to predict the characteristics of swirling flow in a long pipe. Polyethylene, polystyrene and polyvinyl chloride pellets were used for test particles. Total pressure drop including loss due to guide vanes, additional pressure drop due to the particles, flow pattern of particles, particle velocity and particle concentration profiles were examined for different air flow rates, particle loadings and intensities of inlet swirl. The is found out to be effective in the inlet region of pipeline, and is able to reduce transport air velocity as compared with the axial flow pneumatic conveying with the same power consumption. A three dimensional numerical simulation of swirling flow pneumatic conveying was carried out for similar flow conditions as experimental ones in horizontal flow by considering particle collision and using k-epsilon model. The effect of particles on gas equations was considered in the source term. For dilute flow, present simulation was found valid as for particle velocity, particle concentration and average air velocity profiles.

对水平管道和垂直管道的颗粒旋流气力输送系统进行了研究。管道由内径80 mm的管子组成，长约12m。旋流是由不同流动角度的轴向导叶产生的，其特征是气体流动的旋流数。给出了一种预测长管内旋流特性的经验方法。用聚乙烯、聚苯乙烯和聚氯乙烯颗粒作为试验颗粒。考察了不同风量、不同颗粒负荷和不同进气旋流强度下的总压降，包括导叶损失、颗粒附加压降、颗粒流型、颗粒速度和颗粒浓度分布。结果表明，该方法在管道进口段是有效的，与相同功率消耗的轴流气力输送相比，能够降低输送风速。考虑颗粒碰撞，采用k-epsilon模型，对水平流中与实验条件相似的旋流气力输送进行了三维数值模拟。在源项中考虑了颗粒对气体方程的影响。对于稀薄流动，本文的模拟结果对颗粒速度、颗粒浓度和平均风速分布是有效的。