付珂欣,王志宇,杨遂军,叶树亮

• 1:中国计量大学计量测试与仪器学院

摘要(Abstract)：

目的:研究粉尘分散状态和湍流动能对最小点火能的影响。方法:采用计算流体力学方法模拟蒽醌和ABS树脂粉尘在西维克球和哈特曼管中的分散过程；实验测试两种粉尘样品在不同点火延迟时间(60、120、180 ms)下的最小点火能；综合分析粉尘分散状态、湍流动能与最小点火能之间的关联规律。结果:蒽醌粉尘在西维克球和哈特曼管中的最佳点火延迟时间均为180 ms,测得的最小点火能为6～10 mJ。ABS树脂粉尘在西维克球中的最佳点火延迟时间为180 ms,测得的最小点火能为195～200 mJ;在哈特曼管中的最佳点火延迟时间为60 ms和120 ms,对应的最小点火能为185～190 mJ。结论:西维克球凭借其较大的喷粉压力，实现了较哈特曼管更优的粉尘分散均匀性，但其内部产生的湍流动能也显著高于哈特曼管；随着点火延迟时间的增加，湍流动能显著降低，但粉尘分散均匀性呈现先变好再变差的趋势；在湍流动能和分散均匀性的综合影响下，采用两种装置测得的粉尘云最小点火能接近。本研究为确定最小点火能评估中的最佳点火延迟时间提供了技术支持。

关键词(KeyWords)： 最小点火能;数值模拟;分散过程;西维克球;哈特曼管

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(No.22173087)

作者(Author): 付珂欣,王志宇,杨遂军,叶树亮

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