大侧斜对转桨水动力及线谱噪声特性分析

对转螺旋桨的噪声是水下航行器的强噪声源之一,低噪声螺旋桨设计可以通过适当增加螺旋桨叶片数和采用叶片侧斜等方式实现,而对其流体动力及线谱噪声特性进行分析是判定设计优劣的一项重要依据。对于水动力特性计算,基于不可压缩流体雷诺时均方程和RSM湍流模型,多旋转区域耦合问题采用滑移网格进行处理,仿真计算得到普通对转桨和大侧斜对转桨的推力、扭矩、航速及效率等相关参数信息。对于线谱噪声特性,采用时域耦合方法进行求解,声场计算模型基于广义K-WH方程,计算得到了两型螺旋桨的线谱噪声特性。通过对比分析,大侧斜对转桨的水动力特性及线谱噪声特性优于普通对转桨,达到低噪声螺旋桨设计的目的。

Features of Hydrodynamics Performance and Tone Noise for High-skewed Contra-rotating Propeller

The noise of contra-rotating propeller （CP） contributes a major part to the underwater vehicle noise. Low-noise propeller can be designed by increasing blade＇ s number or employing skewed-blade, etc. The hydrodynamics and tone-noise performance calculation was based on the Reynolds-averaged equation and RSM turbulence model, in which the multi-rotating area problem was solved by sliding mesh. The factors for was calculated for conventional and high-skewed CP, such as thrust, torque, speed, efficiency, etc. The tone-noise properties were solved by the time-domain coupling method. The calculation method of acoustic field was based on generalized K-WH equation. Calculation shows that high-skewed CP have bet- ter performance related to the conventional CP on the hydrodynamics and tone-noise performance. It is at- tained for the design propose of low-noise propeller.