多喷管二段式新型引射器数值模拟
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摘要
为了进一步解决铁钢包烘烤器在烘烤过程中烟气抽吸问题,提出了多喷管二段式扩压引射器结构,并利用Fluent软件对新型引射器进行数值模拟,分析不同喷管数量以及二段式扩压结构对烟气引射效果的影响。结果表明,随着喷管数量的增加,接受室内工作流体产生的低压区更为明显;喷管数量的增加使得混合室内工作流体与烟气混合更为均匀,流速分布范围减小;二段式扩压结构消除了单级扩压室出口的速度死区或回流区,扩压效果更加明显。引射器整体引射效果得到极大改善,四喷管二段式扩压结构的引射器在工作流体相对压力为0.3 MPa、烟气相对压力为200Pa的情况下,引射系数高达1.42。
In order to further solve the problem of exhaust gas suction in ladle bakering during baking process,the structure of two-stage diffuser ejector with multi-nozzle was put forward.The new ejector was simulated by Fluent software,and the effects of different nozzle numbers and nozzle′s amount and those of the structure of two-stage diffuser on smoke suction were analyzed.The simulation results showed that with the increase of the nozzle number′s amount,the lower pressure zone produced by the working fluid in the receiving chamber became more obvious.And the increasing of the nozzle′s amount number made the blending effect better and more uniform between the working fluid and the exhaust gas,and the velocity distribution range decreased.There was a velocity dead zone or reflux zone at the exit of the single-stage diffuser,but none in the two-stage diffuser structure and the effects of diffusion became more obvious.The overall ejection effects of the ejector have been greatly improved.The ejection coefficient of the two-stage diffuser ejector with four-nozzle was as high as 1.42 when the relative pressure of working fluid was0.3 MPa and the relative pressure that of the exhaust gas was 200 Pa.
In order to further solve the problem of exhaust gas suction in ladle bakering during baking process,the structure of two-stage diffuser ejector with multi-nozzle was put forward.The new ejector was simulated by Fluent software,and the effects of different nozzle numbers and nozzle′s amount and those of the structure of two-stage diffuser on smoke suction were analyzed.The simulation results showed that with the increase of the nozzle number′s amount,the lower pressure zone produced by the working fluid in the receiving chamber became more obvious.And the increasing of the nozzle′s amount number made the blending effect better and more uniform between the working fluid and the exhaust gas,and the velocity distribution range decreased.There was a velocity dead zone or reflux zone at the exit of the single-stage diffuser,but none in the two-stage diffuser structure and the effects of diffusion became more obvious.The overall ejection effects of the ejector have been greatly improved.The ejection coefficient of the two-stage diffuser ejector with four-nozzle was as high as 1.42 when the relative pressure of working fluid was0.3 MPa and the relative pressure that of the exhaust gas was 200 Pa.
引文
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[2]赵静野,孙厚钧,高军.引射器基本工作原理及其应用[J].北京建筑工程学院学报,2001,17(3):12.
[3]史夏逸,周向,朱繁,等.烧结烟气SCR脱硝反应器流场模拟与设计优化[J].中国冶金,2018,28(1):66.
[4]缪亚芹,王锁芳,吴恒刚.多喷管引射器试验研究与数值模拟[J].南京师范大学学报:工程技术版,2006,6(2):72.
[5]廖达雄,陈吉明,余永生.引射器增强混合喷嘴性能实验研究[J].实验流体力学,2007,21(3):24.
[6]刘培启,王海涛,武锦涛,等.引射器关键结构参数优化设计及验证[J].大连理工大学学报,2017,57(1):29.
[7]陈吉明,廖达雄,王海峰,等.引射器混合室优化技术初步研究[J].实验流体力学,2013,27(1):83.
[8]张志刚,郑绥旭,丁志伟.烧结烟气循环技术工业化应用概述[J].中国冶金,2016,26(7):54.
[9]Bauer R C,German R C,Panesci J H.Methods for determining the performance of ejector-diffuser systems[J].Journal of Spacecraft and Rockets,2012,3(2):193.
[10]唐建峰,史明亘,刘杨,等.结构参数对气体引射器性能的影响研究[J].流体机械,2012,40(12):121.
[11]Alperin M,Wu J J.Recent development of a jet-diffuser ejector[J].Journal of Aircraft,2015,18(12):10118.
[12]贺军科,吴雄.被动式引射器内流场数值研究[J].固体火箭技术,2005,28(2):116.