Optimization Analysis Of The Explosion-proof Diesel Engine Air Intake System

Explosion-proof diesel engine as one of the main vehicle power in theunderground, with its high combustion efficiency, low fuel consumption, andthe advantages of safety, flexible operation, which is applicated more andmore widely. However, explosion-proof diesel engine air intake system add toexplosion-proof device, such as intake flame arrester and air shutoff valve,which increase air flow resistance and reduce the diesel engine volumetricefficiency and combustion efficiency, and lead to reduce its powerperformance and fuel economy. Therefore, research how to reduce air flowresistance of the explosion-proof diesel engine air intake system. It has greatsignificance of improve the performance of explosion-proof diesel engine.Base on the6100explosion-proof diesel engine as the research object,using computational fluid dynamics (CFD) and FLUENT analysis software.We analysis intake flame arrester and intake manifold of explosion-proofdiesel engine internal flow characteristic, and select the reasonable structure ofintake flame arrester and intake manifold parameter, leading to reduce air flowresistance and improve each cylinder evenness, thus advance the performance of the explosion-proof diesel engine. The paper main research content asfollow:(1) Apply to UG software to establish intake flame arrester of the6100explosion-proof diesel engine fluid dynamics model. Thus, using FLUENTsoftware simulate its internal flow field and through the contours of staticpressure、the contours of velocity magnitude、the turbulent kinetic energy toanalyze different fence intervals to impact on air inflow. Finally, We choice0.3mm fence interval of the flame arrester is better reasonable at eventually.(2) In order to solve the blast intake flame arrester pressure differential andthe air inflow reduced problem, the paper selected three important factors whatthe intake pipe length, pressure stabilization cavity angle and fence intervalsdistance, and each factor selects three levels to orthogonal test analysis. Itworks out that each factor the order of affect air inflow, and we ascertain thebest matching scheme about intake fence structure.(3)6100explosion-proof diesel engine intake manifold aboutthree-dimensional flow field is simulated by used FLUENT，and are carried onanalyzing about the internal of the manifold flow characteristics. Based onfluid dynamics, we make the original design to improve, and analysis of thetwo kinds of intake manifold structure of the exit velocity, manifold air flowvelocity and turbulence kinetic energy. The results show that reduce thepressure stabilization cavity and between the pressure stabilization cavity and manifold set part of the transition section of each cylinder diesel engine willhelp to improve diesel engine intake evenness of each cylinder, and thusincrease the volume, improve the performance of the engine.(4) Changing the length and diameter of inlet manifold and intake pipe andusing the simulate GT-POWER software to optimize and choose the best sizeaccording to the power performance、fuel power performance as the basis. Onthe basis of the arrangement of engine and analysis results show that decreasethe manifold and the intake pipe length, increase the manifold diameter ishelpful to improve the performance of the engine.