CAJ | 학술논문

文章运用计算流体力学和直接边界元方法计算叶轮旋向对喷水推进器水下辐射噪声性能的影响。首先，采用计算流体力学方法计算和分析了某喷水推进泵的裸泵性能曲线，并与厂商数据比较以验证CFD计算方法；然后，计算某“船体+流道+喷水推进泵”的稳态流场，在此基础上计算喷泵内的非定常流场，并获得了叶轮叶片、导叶叶片、轮毂和外壳壁面上的偶极源以及固体壁面上的单元和节点信息；最后，采用直接边界元方法计算喷水推进泵的声场分布。结果表明：喷泵内最大压力脉动在叶轮进口处，压力脉动幅值从轮毂到轮缘逐渐增大；叶轮进口处的压力脉动幅值外旋泵比内旋的大，但在叶轮和导叶相互作用区域则相反；在10～1000 Hz内，叶轮和导叶相互作用区域对于辐射噪声的贡献是最主要的；内旋泵的总声压比外旋泵的总声压级大2.4 dB。
문장운용계산류체역학화직접변계원방법계산협륜선향대분수추진기수하복사조성성능적영향。수선，채용계산류체역학방법계산화분석료모분수추진빙적라빙성능곡선，병여엄상수거비교이험증CFD계산방법；연후，계산모“선체+류도+분수추진빙”적은태류장，재차기출상계산분빙내적비정상류장，병획득료협륜협편、도협협편、륜곡화외각벽면상적우겁원이급고체벽면상적단원화절점신식；최후，채용직접변계원방법계산분수추진빙적성장분포。결과표명：분빙내최대압력맥동재협륜진구처，압력맥동폭치종륜곡도륜연축점증대；협륜진구처적압력맥동폭치외선빙비내선적대，단재협륜화도협상호작용구역칙상반；재10～1000 Hz내，협륜화도협상호작용구역대우복사조성적공헌시최주요적；내선빙적총성압비외선빙적총성압급대2.4 dB。
Computational fluid dynamic (CFD) and direct boundary element method (DBEM) were used to calculate the influence of rotation direction of impeller on noise performance of waterjet. Firstly, CFD was applied to calculate and analyze the open-water ’s pump performance of a mixed flow waterjet pump, the numerical result was compared with the manufacture’s data in order to veri-fy the credibility of numerical method. Secondly, the unsteady field of the ‘hull+ duct+ waterjet’ was calculated based on the steady result, from which the dipoles of the blade, stator, hub, shroud and the element node information of the solid surface could be obtained. Lastly, the direct boundary element method was applied to calculate the acoustic strength distribution of waterjet. The result show that the maximum pressure fluctuation is located at the impeller inlet, the pressure fluctuation ampli-tude increases from hub to shroud;in the impeller inlet the pressure fluctuation amplitude of the in-ward pump is stronger than the outward, but in the interaction area the outward pump is stronger. Be-tween the 10~1 000 Hz, the interaction area of the impeller and stator is the main acoustic source, the total sound pressure lever of inward pump is 2.4 dB larger than outward.