Compressible 1D-3D simulation of a muffler with pseudosound prediction levels.

Numerical software for the simulation of thermal and fluid-dynamic behavior of hermetic reciprocating compressors is a must for its understanding and improvement. Hence, these tools are widely used to improve compressor performance in terms of COP. However there is a trade of between COP increase and noise levels produced by the compressor. The work is focused on numerical prediction of noise generation due to the fluid flow phenomena, with special attention to pressure perturbations. Because the suction muffler is a key-point in noise reduction, this element is numerically studied using two modeling approaches, first through compressible CFD and second through simplified one-dimensional models. The obtained numerical data is post-processed in order to obtain the characteristic frequency charts of the muffler geometry setup working under the compressor boundary conditions.

用于模拟全封闭往复式压缩机热力及流体动力学行为的数值软件，是理解与改进该类压缩机的必备工具。因此，这类工具被广泛用于提升压缩机的性能系数（COP）。然而，压缩机COP的提升与噪声水平之间存在权衡关系。本研究聚焦于流体流动现象引发的噪声生成的数值预测，尤其关注压力扰动。由于吸气消声器是降噪的关键部件，本研究采用两种建模方法对其进行数值分析：其一为可压缩计算流体动力学（CFD）方法，其二为简化一维模型方法。对所得数值数据进行后处理，以获取该消声器几何结构在压缩机边界条件下工作时的特征频率图谱。