共振消声器共振频率的数值分析

采用数值模拟方法,对具有不同结构参数的消声器建模,并进行仿真分析,发现气流再生噪声的峰值频率即为消声器的共振频率;通过气流再生噪声的计算得出不同结构参数对消声器共振频率的影响,结果表明:共振腔形状及高径比对消声器的共振频率均有影响,当共振腔形状为正方体时,共振频率最高,共振腔为球体时,共振频率最低;当高径比为0.6时,共振频率最高,随着高径比的增大或减小,共振频率向两端都在不断降低。

Numerical Analysis of Resonant Frequency in Resonance Muffler

Through the method of numerical simulation,model mufflers with different structural parameters for simulation were analyzed.Through analysis it was found that the flow noise peak frequency value is close to the resonant frequency of resonance muffler.Finally,the flow regeneration noise was calculated to get the influence of different structural parameters on resonant frequency.The results show that: the cavity shape and the ratio of height to diameter have influence on the resonant frequency of muffler.When the cavity shape is a cube,the resonant frequency is the highest;while it is spherical,the resonant frequency is the lowest.When the ratio of height to diameter is 0.6,the resonant frequency reaches the maximum;while with the increase or decrease of height to diameter ratio,the resonant frequency constantly reduces to the two ends.