CAJ | 학술논문

基于黏流的数值模拟技术在非均匀来流情况下对DTMB P4119桨所受的非定常力进行了分析.该桨已在DTMB用给定的非均匀轴向进流场做过非定常水动力测量,故本文计算用该进流场作为进流条件并把该试验结果用来验证.计算过程分析了网格数的收敛性. 非定常力的计算的预报结果,明显地反映了1阶,2阶及3阶叶频的轴承力幅值与进流阶调的耦合效应.通过计算结果与试验结果的对比,不论是非定常力的演变特征还是脉动幅度都与试验结果吻合良好.通过简单定性分析认为通过计算得到的非定常力预报螺旋桨线谱噪声误差将在3dB以内,比较理想.
기우점류적수치모의기술재비균균래류정황하대DTMB P4119장소수적비정상력진행료분석.해장이재DTMB용급정적비균균축향진류장주과비정상수동력측량,고본문계산용해진류장작위진류조건병파해시험결과용래험증.계산과정분석료망격수적수렴성. 비정상력적계산적예보결과,명현지반영료1계,2계급3계협빈적축승력폭치여진류계조적우합효응.통과계산결과여시험결과적대비,불론시비정상력적연변특정환시맥동폭도도여시험결과문합량호.통과간단정성분석인위통과계산득도적비정상력예보라선장선보조성오차장재3dB이내,비교이상.
Based on numerical simulation in viscous flow, the unsteady thrust and torque of propeller DTMB 4119 was predicted. Since that propeller was test in a given non-uniform axial inflow in DTMB, that inflow condition was adopted in present analysis and that test results can be used for validation. The grid convergence was verified in the present study. The results of predicted thrust and torque clearly presents the couple effect between wake harmonics and 1st, 2nd and 3rd blade frequency forces. The comparisons between the calculated and experimental forces show good agreement with each other. After a qualitative analysis, the error of noise prediction based on the calculated unsteady forces will be within 3dB expected, which includes the error caused by the error of force prediction so it seems a satisfactory result.