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气动射流除泡器参数仿真分析及优化
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作者 张成宇 袁艳萍 +1 位作者 曾勇 陈继民 《北京工业大学学报》 CAS CSCD 北大核心 2022年第3期230-242,共13页
为解决发酵中大量泡沫导致的工作体积减小、环境污染等问题,研制出一种环保生物发酵除泡器,用纯机械的拉瓦尔结构达到无污染、高除泡效率的目的.通过三维共轭有限体积模拟,比较了传统螺旋式和拉瓦尔式除泡器结构在同等工作条件下的进口... 为解决发酵中大量泡沫导致的工作体积减小、环境污染等问题,研制出一种环保生物发酵除泡器,用纯机械的拉瓦尔结构达到无污染、高除泡效率的目的.通过三维共轭有限体积模拟,比较了传统螺旋式和拉瓦尔式除泡器结构在同等工作条件下的进口流速和负压性能.针对拉瓦尔结构进行了参数分析,利用ANSYS Workbench进行了响应面和敏感度分析,并进行了优化.结果表明:相较于螺旋式除泡器,以拉瓦尔结构为核心的除泡器泡沫进口处平均气体流速提高了2~4倍,入口平均负压提高了57~599 Pa;拉瓦尔结构的最佳喉部半径为5 mm,压缩段长度50 mm,扩张段长度85 mm.采用拉瓦尔结构除泡器有望推动生物发酵行业低能耗、零排放,助力"双碳"目标的实现. 展开更多
关键词 生物发酵 气动射流结构 拉瓦尔结构 环保除泡器 响应面优化 碳中和
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Aerothermal characteristics of bleed slot in hypersonic flows 被引量:2
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作者 YUE LianJie LU HongBo +1 位作者 XU Xiao CHANG XinYu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第10期46-59,共14页
Two types of flow configurations with bleed their aerodynamic thermal loads and related in two-dimensional hypersonic flows flow structures at choked conditions. are numerically examined to investigate One is a turbul... Two types of flow configurations with bleed their aerodynamic thermal loads and related in two-dimensional hypersonic flows flow structures at choked conditions. are numerically examined to investigate One is a turbulent boundary layer flow without shock impingement where the effects of the slot angle are discussed, and the other is shock wave boundary layer in- teractions where the effects of slot angle and slot location relative to shock impingement point are surveyed. A key separation is induced by bleed barrier shock on the upstream slot wall, resulting in a localized maximum heat flux at the reattachment point. For slanted slots, the dominating flow patterns are not much affected by the change in slot angle, but vary dramatically with slot location relative to the shock impingement point. Different flow structures are found in the case of normal slot, such as a flow pattern similar to typical Laval nozzle flow, the largest separation bubble which is almost independent of the shock position. Its larger detached distance results in 20% lower stagnation heat flux on the downstream slot corner, but with much wider area suffering from severe thermal loads. In spite of the complexity of the flow patterns, it is clearly revealed that the heat flux generally rises with the slot location moving downstream, and an increase in slot angle from 20° to 40° reduces 50% the heat flux peak at the reattachment point in the slot passage. The results further indicate that the bleed does not raise the heat flux around the slot for all cases except for the area around the downstream slot corner. Among all bleed configurations, the slot angle of 40° located slightly upstream of the incident shock is regarded as the best. 展开更多
关键词 boundary layer control boundary layer heat flow shock wave interactions separated flows
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基于火焰对冲及TVC驻涡技术的高效燃气灶
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作者 雷铭达 赵利达 +2 位作者 潘菲 刘轩 杨荣乾 《节能》 2020年第8期73-76,共4页
天然气作为传统家用燃气,具有安全性高、能量密度大、污染小的优点。但现有家用燃气灶燃烧效率普遍较低,有些甚至低于国家最低标准。为了充分利用燃气能量、提升燃气灶燃烧效率,设计了一种利用先进燃烧原理的新型高效家用燃气灶。通过... 天然气作为传统家用燃气,具有安全性高、能量密度大、污染小的优点。但现有家用燃气灶燃烧效率普遍较低,有些甚至低于国家最低标准。为了充分利用燃气能量、提升燃气灶燃烧效率,设计了一种利用先进燃烧原理的新型高效家用燃气灶。通过构建半封闭式燃烧室,利用拉瓦尔喷管结构、多射流切圆结构、火焰对冲技术、TVC驻涡结构,使燃烧室内燃气与空气混合更加充分,灶具内形成大量涡旋卷吸未完全燃烧气体进行二次燃烧,从而降低尾气中有害气体成分。装置实现了先进燃烧技术的民用化改进,极大提高了燃气灶燃烧效率,具有较高的节能减排效益。 展开更多
关键词 燃气灶 火焰对冲技术 TVC驻涡结构 拉瓦尔喷管结构 多射流切圆结构
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