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为了更加有效地预测和评估某涡轮增压器出口消声器的消声性能,首先采用三维CFD法计算该消声器在无流条件下的消声量,用实验测量结果验证CFD模型的可靠性.进一步用CFD法计算了消声器有平均流时的传递损失,以便直观地分析消声器的声学性能,发现随着平均流马赫数和温度的提高,传递损失高值区间向高频区域移动.在发动机台架上测量了增压器低转速工况下消声器的插入损失,对比CFD方法计算的传递损失,评估了消声器在此工况下的消声特性.最后用CFD方法预估了消声器在发动机实际工况下的消声性能.
In order to more effectively predict and evaluate the muffler performance of a turbocharger outlet muffler, the three-dimensional CFD method is used to calculate the muffling volume of the muffler under no-flow condition and the experimental results are used to verify the reliability of the CFD model. Method to calculate the muffler transmission loss when the average flow in order to intuitively analyze the acoustic performance of the muffler and found that with the average flow Mach number and temperature increases the transmission loss high value range to the high frequency region measured on the engine bench The insertion loss of the muffler under low speed condition was compared with the transmission loss calculated by the CFD method to evaluate the muffling characteristics of the muffler under this condition.Finally, the CFD method was used to predict the muffler’s performance under the actual engine condition Muffler performance.