柴油机螺旋气道结构参数对其流动特性的影响  被引量:4

Influence of Structural Parameters of Diesel Engine Helical Intake Port on Its Flow Characteristics

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作  者:雷基林[1] 申立中[1] 毕玉华[1] 贾德文[1] 

机构地区:[1]昆明理工大学云南省内燃机重点实验室,昆明650224

出  处:《内燃机工程》2012年第5期87-92,共6页Chinese Internal Combustion Engine Engineering

基  金:国家自然科学基金项目(51105184);云南省应用基础研究基金资助项目(2009ZC036M)

摘  要:针对柴油机复杂的螺旋进气道结构,在前期螺旋进气道的参数化设计方法研究的基础上,结合气道稳流模拟试验,建立不同结构的螺旋进气道流动仿真模型。采用计算流体动力学三维模拟的方法研究了螺旋进气道最小截面处的几何形状、螺旋段螺旋半径和螺旋终止角等结构参数对气道流动特性的影响关系。研究结果表明:通过改变螺旋气道最小截面处外侧形状、增大最小截面积和改变螺旋段形状、增大螺旋半径,可增大气道平均流量系数,降低平均涡流比;改变最小截面处内侧形状和改变螺旋段螺旋终止角对气道流动特性的影响较为复杂,不呈现单调变化规律。For complex structure of diesel engine helical intake port, based on the previous research results of parameterized design method and steady flow experiments, the numerical simulation models of different structure helical ports were built up. Impact of structural parameters of helical port, e.g. geometry shape at rain. cross-section position, gyration radius and spiral end angle at helical segment on port flow characteristics was investigated by three-dimensional computational fluid dynamics(CFD) simulation method. The results indicate that increasing area of min. cross-section position by changing the outside shape at min. cross-section region of helical port and increasing gyration radius by changing helical segment shape, average swirl ratio can be decreased and port average discharge coefficient can be increased. Influence relationship of changing inside shape at helical port min. cross-section position and spiral end angle at helical segment on port flow characteristics is more complex and does not exhibit the monotonic trend.

关 键 词:内燃机 柴油机 螺旋进气道 流动特性 影响关系 

分 类 号:TK421.3[动力工程及工程热物理—动力机械及工程]

 

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