An integral panel method for the hydrodynamic analysis of hybrid contra-rotating shaft pod propulsors

The present work is devoted to developing an efficient method for the analysis and design of hybrid contra-rotating shaft pod(HCRSP)propulsors.The geometry of contra-rotating propulsor(CRP)was then analyzed,and a steady integral panel method that treats the forward and aft propellers as a whole part is presented.During the study,the control equation of the steady integral panel method for CRP is derived in detail.From the experience of developing an integral panel method for CRP,the characteristics of panel singularity strength in HCRSP propulsor was analyzed.Based on this analysis,an integral panel method for HCRSP propulsor is developed and the wake model discussed.Then,the method is applied in the performance analysis of HCRSP propulsor.Comparison between experimental data and numerical results shows that the steady integral panel method has good accuracy in terms of open water performance.Regarding the latter,the error source in the steady integral panel method is discussed.

混合式CRP推进器操舵工况水动力性能数值研究

[目的]为了研究操舵工况对混合式CRP推进器水动力性能的影响,[方法]采用RANS方法结合SST k-ω湍流模型计算NACA0012型敞水舵的升力系数,通过与试验数据的对比,选定数值计算的近壁面网格布置和近壁面处理方式。在此基础上,进一步预报偏转工况下吊舱推进器的水动力性能,通过试验对比,表明误差在较小范围内。以混合式CRP推进器为研究对象,采用该数值方法预报操舵工况下该型推进器的水动力性能并予以分析。[结果]研究发现,该型推进器后桨推力、吊舱横向力和操舵力矩均随偏转角的增大而增大,前桨推力基本不随偏转变化。[结论]表明该型推进器操纵性能优良,具有广阔的工程应用前景。

基于伴随方法的混合式CRP空泡性能优化

为探索出高效可靠的混合式CRP(对转吊舱)推进器优化设计方法,基于定常整体面元法,开展混合式CRP推进器伴随方法的应用研究.建立混合式CRP推进器的伴随方程,计算推力、扭矩系数及剖面最大负压系数与前、后桨螺距及拱弧之间的敏感导数,根据敏感导数结果,结合定常整体面元法,开展混合式CRP推进器的优化设计.优化中保持前、后桨的推力、扭矩不变,改善螺旋桨的空泡性能.对优化前、后的混合式CRP推进器加工模型,在空泡水筒中进行模型试验,结果表明:优化后混合式CRP推进器的叶梢空泡面积明显减小,同时推力、扭矩系数基本维持不变,验证了伴随方法在混合式CRP推进器优化中的有效性.