基于“声源时间-主导算法”的螺旋桨辐射噪声的数值预报（英文）

Numerical Prediction of Propeller Noise Based on the‘Source Time-Dominant Algorithm’

本文对无空泡的敞水螺旋桨辐射噪声开展了数值预报,采用DES方法来获取螺旋桨绕流信息,用时域的FW-H方程来预报螺旋桨辐射噪声。依据Farassat 1A公式对FW-H方程进行了数值求解,其中延迟时间问题采用了“时间声源-主导算法”来解决。该算法相对于“延迟时间算法”的优势是简化了计算流程,提高了计算速度;而且,采用等时间间隔的流场信息作为声源输入值,与CFD软件结合更为简单。数值预报得到的螺旋桨敞水性能与文献中的实验值吻合良好,声辐射的时间历程也与文献中的预报值吻合良好,证明本文的数值预报方法是可行的。

A numerical study on the radiated noise of a marine propeller operating in uniform inflow was conducted.The flow field around the propeller was simulated based on the unsteady DES(Detached Eddy Simulation)equation.The far-field sound radiation from the propeller was predicted by an in tegral solution of FW-H(Fowcs Williams-Hawkings)equation in time domain.The‘source time-dominant algorithm"was adopted to perform the retarded-time integral of the Farassat Formation 1A.This algorithm is more computationally efficient than the!retarded time algorithm",due to its sim pler calculation process.Moreover,it can easily collaborate with the input data given by CFD,since no interpolation of the source data is required.Both the computed open water performance of the pro peller and the computed noise signals induced by the propeller are in good agreement with the avail able results in literatures.The characteristics of the noise induced by a single blade and the four-blade propeller are also discussed.