有流消声器四极参数和传递损失的边界元法预测

Boundary Element Analysis of Four-pole Parameters and Transmission Loss of Silencers with Flow

将子结构法和双倒易边界元法联合应用于预测具有三维复杂流存在时管道和消声器的四极参数与传递损失,阐述其基本原理与数值过程.结果表明,双倒易边界元法可正确预测具有较高马赫数亚音速复杂流时管道及消声器的四极参数和传递损失,子结构法可有效降低数值处理过程的复杂性,并提高运算精度和速度.

A substructure method and a dual reciprocity boundary element method （DRBEM） are applied to calculate four-pole parameters and transmission loss of ducts and silencers with complex flow. Basic principle and numerical procedure are introduced in detail. It is shown that the DRBEM is valid to compute four-pole parameters and transmission loss of ducts and silencers with subsonic complex flow with higher Mach number. The substructure method reduces numerical complexity of the DRBEM and improves accuracy and computation speed.