摘要
冰粒相互黏结以及配送器表面凹槽参数选取不合理,会导致冰粒气射流清洗装备冰粒输出效果不稳定、系统易发生堵塞等问题,为此,对航空发动机零件冰粒气射流清洗装备的输冰系统结构进行了优化设计与仿真研究。首先,利用计算流体力学(CFD)仿真软件Fluent模拟了高压气体进入配送器凹槽的过程,探究了不同形状、不同尺寸凹槽的内部流场特性;然后,在输冰系统中引入了搅拌系统,选取了适用于该技术工况的搅拌结构类型并建立了模型;最后,计算流体力学-离散单元法耦合(CFD-DEM)建立了仿真模型,模拟了冰粒进入料仓底部后被搅拌的过程,探究了特定工况下不同结构搅拌器的搅拌性能。研究结果表明:与方形槽相比,圆形槽内流场的速度分布更加均匀,配送器表面凹槽的最优选择为直径18 mm、深度15 mm的圆形凹槽,其底部气流最大速度可达228 m/s;搅拌器最优结构为扁状叶片“日”字形锚框式搅拌器,可使料仓底部冰粒平均速度达到0.7296 m/s。合理选择配送器表面凹槽形状及尺寸可以增大其底部气流的最大速度,同时引入优选搅拌结构能够促进系统易堵塞区域的冰粒运动,可以解决冰粒输出不均及系统堵塞问题。
Aiming at resolving the instability of ice particle output and frequent system blockages in ice particles air-jet cleaning equipment caused by ice particle agglomeration and irrational groove parameter selection on the feeder surface,the structure of ice conveying system of aero-engine parts ice particle gas jet cleaning equipment was optimized and simulated.Firstly,the process of high-pressure gas entering the grooves of the feeder was simulated using computational fluid dynamics(CFD)software Fluent.The internal flow field characteristics of grooves with different shapes and sizes were investigated.Then,a stirring system was introduced into the ice delivery system.An agitator structure type suitable for the technical working conditions was selected and modeled.Finally,a coupled computational fluid dynamics-discrete element method(CFD-DEM)simulation model was established to simulate the stirring process of ice particles entering the bottom of the feed bin.The mixing performance of agitators with different structures under specific working conditions was studied.The research results show that the circular grooves on the feeder surface exhibits more uniform velocity distribution in their internal flow fields compared to square grooves.The optimal groove configuration is identified as a circular groove with a diameter of 18 mm and a depth of 15 mm,and under these geometric parameters,the maximum airflow velocity at the groove bottom reaches 228 m/s.The optimal agitator structure is determined to be the"日"shaped flat paddle configuration.This anchor frame agitator structure effectively enhances ice particle motion,and the average velocity of ice particles at the feed bin bottom achieves 0.7296 m/s.The rational selection of groove shape and dimensions on the feeder surface is demonstrated to effectively increase the maximum airflow velocity at the groove bottom,while the introduction of an optimized agitator structure significantly enhances ice particle motion in system-prone blockage regions.These combined measures systematically address the issues of uneven ice particle output and system blockages.
作者
孙晶
仇学露
王星烁
张柄桢
崔笑卿
宋金龙
SUN Jing;QIU Xuelu;WANG Xingshuo;ZHANG Bingzhen;CUI Xiaoqing;SONG Jinlong(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《机电工程》
北大核心
2025年第10期1990-2000,共11页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(52175380)
辽宁省自然科学基金优秀青年基金资助项目(2023JH3/10200013)
航空科学基金资助项目(2023Z045063001)。
关键词
流场分析
冰粒气射流
航空发动机
输冰系统
配送器
搅拌器
flow field analysis
ice particles air-jet
aero-engine
ice particles delivery system
feeder
agitato
