飞机除冰车蒸汽射流喷头喷射面结构优化设计

采用蒸汽射流技术对飞机机身进行除冰,对蒸汽喷头的结构进行优化设计,喷嘴采用均匀分布的方式进行研究。首先对水平喷射面的喷头进行仿真分析,运用FLUENT软件对奇偶数量的喷嘴进行仿真研究,对温度场进行分析,奇数型优于偶数型,但是除冰效果提升并不明显;其次对弧形喷射面的喷头进行分析,三弧形优于四弧形,四弧形优于平面型,三弧形喷嘴偶数分布的射流干扰低于奇数分布;最后对喷头的除冰效果进行实验验证。得出结论:三弧形偶数喷嘴排布的喷头射流仿真模型的蒸汽射流干扰小,计算区域内的平均温度较高,冰层剩余量最小能提高整车除冰的工作效率。

基于正交优化设计的除冰车蒸汽射流喷嘴排布仿真研究

在进行除冰作业时,由于单个喷嘴除冰作业的范围有限,无法满足大面积的除冰需求,为此,要实行多喷嘴同时除冰作业。在多个喷嘴同时射流除冰的过程中,喷嘴之间会产生相互影响,为了使射流蒸汽分布的较为均匀,避免过多的蒸汽冗余或产生较大间隙。本文利用FLUENT软件建立相关仿真模型,采用正交设计方法,在蒸汽射流量、温度、压力以及作业面积相同的条件下,分析了喷嘴直径、喷嘴间距、作业高度这三个因素对除冰效率的影响,并设计了对比方案。研究得到了一种最佳的除冰方案,并确定了三种因素影响除冰效率的主次顺序依次为喷嘴直径、喷嘴间距和作业高度。

蒸汽射流喷嘴的排布优化设计

针对蒸汽射流除冰所用蒸汽射流喷头的喷嘴进行优化设计,确定采用对称均匀分布方式来布置喷嘴。运用Fluent软件对奇偶数量的喷嘴进行仿真,并对温度场云图进行了分析。仿真结果显示,奇数喷嘴均布排列仿真模型的射流干扰和溢流损失均低于偶数喷嘴。对垂直射流和非垂直射流的喷嘴仿真表明,奇数喷嘴均布排列非完全垂直射流仿真模型的温度场分布较优,计算区域内平均温度较高,能够提高整车除冰的工作效率。

Sound Character Calculation and Analysis of Sound Barrier Based on Acoustoelectric Analogy

A new acoustic barrier structure with resonant sound of micro-perforation board absorption structure and impedance composite sound-absorption structure is proposed.The acoustic impedance and the sound-absorption coefficient of the acoustic structure are calculated via means of equivalent circuit.MATLAB is used to calculate the relationship between the parameters of the ontology structure and the sound-absorption coefficient and the sound insulation.It is revealed that the sound barrier of the new ontology structure is 7.659.80 dB,which is more than the sound barrier of the traditional reflective structures.The relationships among the parameters of sound-absorption structure,sound-absorption coefficient,and sound insulation performance are obtained.In addition,the parameters can be transformed to satisfy the noise reduction requirements of various road sections,which has a admirable adaptability.The acoustic barrier can have tremendous acoustic performance only if there is a splendid sound insulation in the traffic noise frequency band.