【摘要】 为了将由水解装置产生的氢气由进气总管处引入柴油机,设计了一套文丘里管装置,将压力较低的氢气(0.15 MPa)自发地引入压力较高的进气总管(0.25 MPa)内。为了优化该文丘里管的吸氢能力,并降低文丘里管装置对发动机进气的影响,同时确保文丘里管结构尺寸较小便于安装,采用CFD软件FIRETM模拟了发动机实际工况下的文丘里管内气体流动情况,分析了分流流量、喉口管径、导流段管径、收缩角、扩压角、收缩圆角半径、扩压圆角半径等7个参数对氢气吸入能力的影响特征。结果表明:参数优化后文丘里管能够产生足够的低压,使水解的氢气顺利地吸入进气总管,同时不对发动机进气产生较大的流阻影响。更多还原

【Abstract】 In order to guide hydrogen that generated from hydrolysis equipment into diesel engine through intake manifold,a set of venture was designed to guide hydrolytic low-pressure hydrogen(0.1 MPa)to high-pressure intake manifold(0.25 MPa).Considering the hydrogen inhalation capacity,intake influence and assembly convenience of venturi,the gas flow movement inside venturi under engine operating conditions was simulated with CFD Fire software and the effects of divided flow rate,throat diameter,guide pipe diameter,converging and expansion angle and their correspondent round radii on hydrogen inhalation were analyzed.The results show that the optimized venturi can generate enough low pressure and suck easily the hydrolysis hydrogen into intake pipe while hardly influence the air flow of the engine.更多还原