Structural design and numerical analysis of single nozzle low pressure ejector

doi:10.16085/j.issn.1000-6613.2017-0644

Abstract

Abstract: As an important component of atmospheric burner, ejector has significant effect on steady and complete combustion.Therefore, it is essential to study work process and effect factors of ejector.Structure and size of single nozzle low pressure ejector for atmospheric burner was designed firstly, then a three-dimensional and steady state mathematical model of the ejector was established.CFD(Computational Fluid Dynamics)software was employed to simulated the mixing process of momentum and mass exchange between combustion gas and air inside ejector and analyse the effects of working nozzle outlet diameter,mixed room length,combustion gas supply pressure,ejector outlet back pressure on the mass flow rate ejecting coefficient.Results showed that working nozzle outlet diameter and mixed room length existed the best value respectively to acquire the optimal ejecting coefficient.Combustion gas supply pressure have little effect on ejecting coefficient.Besides, it's showed that the ejecting coefficient declined with the increase of ejector outlet back pressure.

Key words: single nozzle low pressure ejector, structural design, mixing, mass flow rate ejecting coefficient, numerical analysis

摘要： 引射器作为大气式燃烧器的重要组件，对燃烧器的稳定、完全燃烧具有重要的影响，因此对引射器的工作过程和影响其工作性能因素的研究尤为重要。本文首先对大气式燃烧器用的单喷嘴低压引射器的结构形式及具体尺寸进行了设计，并对设计出的引射器建立了三维、稳态的数学模型。然后利用计算流体力学（computational fluid dynamics，CFD）软件对引射器进行了模拟计算，探究了引射器内燃气与空气发生动量和质量交换的混合过程并研究了工作喷嘴出口直径、混合室长度、燃气供气压力、引射器出口背压4个因素对引射器质量流量引射系数的影响。研究结果表明：当引射器其他参数相同时，工作喷嘴出口直径与混合管长度都存在一个最佳值使得引射器达到最优的引射系数；燃气供气压力增大对引射系数的影响很小，引射系数几乎不变，而当引射器出口背压增大时，引射系数却下降的很快。

关键词: 单喷嘴低压引射器, 结构设计, 混合, 质量流量引射系数, 数值分析

CLC Number:

TH48

SHANG Yang, WANG Yueshe. Structural design and numerical analysis of single nozzle low pressure ejector[J]. Chemical Industry and Engineering Progress, 2017, 36(S1): 107-114.

尚阳, 王跃社. 单喷嘴低压引射器的结构设计与数值分析[J]. 化工进展, 2017, 36(S1): 107-114.

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