CAJ | 학술논문

以某型号大型船用涡轮增压器压气机为研究对象，以CFD软件为平台，利用具有k－ε双方程湍流模型的N－S方程计算了压气机的三维黏性非定常流场特性。采用Ffowcs Williams－Hawkings方程（简称 FW－H方程）对压气机的离散噪声进行了分析，并与经验公式进行了比较。深入研究了不同转速、流量对压气机气动噪声的影响。分析表明，叶轮内气动噪声水平较高，是主要噪声源；转速对于离散噪声影响较大，转速增加一倍，声压级上升约14dB；同一转速下，流量的降低将导致噪声幅值增加，但相对于转速变化其影响较小。
이모형호대형선용와륜증압기압기궤위연구대상，이CFD연건위평태，이용구유k－ε쌍방정단류모형적N－S방정계산료압기궤적삼유점성비정상류장특성。채용Ffowcs Williams－Hawkings방정（간칭 FW－H방정）대압기궤적리산조성진행료분석，병여경험공식진행료비교。심입연구료불동전속、류량대압기궤기동조성적영향。분석표명，협륜내기동조성수평교고，시주요조성원；전속대우리산조성영향교대，전속증가일배，성압급상승약14dB；동일전속하，류량적강저장도치조성폭치증가，단상대우전속변화기영향교소。
The unsteady three-dimensional viscous flow field of a large marine turbocharger compressor was simulated by Navier–Stokes equations with the two-equation ( k-ε) turbulence model based on the CFD software.The discrete noise of the com-pressor was analyzed by the Ffowcs Williams-Hawkings formulation ( FW-H for short) ,and the results were compared with the ex-perimental formula.The effect of the speed and the flow rate on the aerodynamic noise was further studied.The numerical results indicate that the aerodynamic noise of the impeller is dominant;the rotating speed of the impeller has a great influence on the dis-crete noise,the noise increased by about 14dB when the rotating speed was doubled;the noise will increase when the flow rate re-duces at the same speed,but the effect is much less than the speed of the impeller.