矿用防爆柴油机排气栅栏结构研究  

Study on Exhaust Fence Structure of Mine Flame Proof Diesel Engine

作　　者：齐丽丽[1] 张翠平[1] 齐东东[1] 张忠国 李天鹏[1] 

机构地区：[1]太原理工大学机械工程学院,山西太原030024 [2]中国煤炭科工集团太原研究院,山西太原030006

出　　处：《煤炭工程》2013年第3期121-123,共3页Coal Engineering

基　　金：2012年太原市大学生创新创业人才项目(120164048);山西省煤矿装备研究生教育创新中心科研项目(MKY2011-007)

摘　　要：防爆柴油机排气栅栏是用来熄灭排气系统中易燃气体,降低排气温度的安全装置,但是排气栅栏的安装,却增加了排气系统的阻力,从而影响防爆柴油机的动力性和经济性。文章利用UG软件建立了防爆柴油机排气栅栏的三维几何模型,应用FLUENT软件对排气栅栏内部流场进行了模拟,并对长方管和短方管两种不同结构的排气栅栏进行了对比分析。结果表明,气流流经排气栅栏时,由于进口段与进口方管之间存在截面突变,最大压降位于栅栏段处,进口方管边侧存在低压区,方管边侧的低压区与周围的高压区形成压差,使气流逆向,形成涡流,减弱了栅栏段两侧的压降。长方管排气栅栏可有效降低涡流强度,减小气流损失,提高流场稳定性,从而改善防爆柴油机的排气性能。The exhaust fence of the flame proof diesel engine is applied to extinguish the combustible gas in the exhaust system and is a safety device to reduce the exhaust temperature. But the installation of the exhaust fence would increase the resistance of the exhaust system and thus would influence the power and economy of the flame proof diesel engine. A UG software was applied to establish a 3D geometric model of the exhaust fence of the flame proof diesel engine. A FLUENT software was applied to the simulation on the inner flow field of the exhaust fence. A comparison analysis was conducted on the different structure exhaust fences of the long square tube and the short square tube. The results showed that when the air flow passing through the exhaust fences, due to the sudden change of the cross section between the inlet section and the inlet square tube, a max pressure drop would be at the exhaust fence and a pressure zone would be at the side of the inlet square tube. A pressure difference would be formed between the low pressure zone of the square tube side and the high pressure zone of the square tube surrounding area. Thus the air flow would be reversed, vortex would be formed and the pressure drop at the two sides of the fence would be reduced. The exhaust fence in the square tube could effectively reduce the vortex strength, reduce the air flow lost and improve the stability of the flow field. Thus the exhaust performances of the flame proof diesel engine could be improved.

关 键 词：防爆柴油机 FLUENT 排气栅栏 压力损失 

分 类 号：TH183.1[机械工程—机械制造及自动化]