考虑非均匀流场的管道声学理论及消声器研究

The Study of Pipe Acoustic Theory and Muffler with Non Uniform Flow Field

研究了考虑非均匀流场的刚性直管声场传递矩阵，通过将刚性直管沿轴向等分成 Ｎ 个微段，并假定每个微段内温度、气流马赫数和声速保持恒定的情况下，利用各微段间声压和体积速度的连续性条件．推导了刚性直管声场传递矩阵和扩张式消声器的插入损失数学模型，并进行了理论计算与声学特性分析．

The transmission matrix of rigid straight pipe with non-uniform flow is studied. By dividing the rigid straight tube into N segments, the temperature, gas Mach number and velocity of sound can be assumed to be invariable. The transfer matrix of the rigid straight pipe and the insertion loss model of expand silencer are established utilizing the continuity condition of pressure and the volume velocity between the boundary of adjacent elements. The theoretical calculation and acoustical property is analyzed.