基于正交试验法的刷式封严泄漏特性数值研究

Numerical Simulation on Leakage Characteristics of Brush Seal on Orthogonal Test Method

为了研究刷式封严的泄漏特性,针对刷环外径Do,刷环内径Di,刷丝直径d,刷丝排列角度β,刷束厚度B,后挡板保护高度HF以及上下游压差Δp,环境温度T和转子转速N等9个影响刷式封严泄漏特性的主要参数,依据正交试验原理设计了32个封严结构模型,对零间隙配合时各参数对泄漏特性的影响进行了数值研究。研究结果表明:在给定的参数范围内,上述参数对刷式封严泄漏量的影响程度有明显区别,其影响程度由主到次的顺序为:Δp→Di→Do→B→d→HF→β→T→N。根据以上正交试验结果可以推断泄漏量最小的刷式封严结构,并用数值计算证明了其泄漏量最小。

Numerical simulation was carried out with 32 models that are designed according to the principle of orthogonal test to study the effects of the main parameters including outer diameter Do,inner diameter Di,bristle diameter d,bristle lay angle β,bristle back width B,fence height HFand pressure drop Δp,rotor speed N,temperature T on leakage characteristics of brush seals,when the clearance between the brush and rotor is zero. The results show that there are obvious differences between the parameters about the influence on leakage within the scope of the parameters. In all of the parameters,the rank of importance on leakage characteristics isΔp → Di→ Do→ B → d → HF→ β → T → N. The geometry for the least leakage can be inferred based on the above test,and it is minimum leakage by numerical simulation.