基于伴随方法的混合式CRP空泡性能优化

Hybrid CRP cavitation performance optimization based on adjoint method

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.

To establish a efficient and stable method for performance design and optimization of hybrid contra-rotating pod(CRP)propulsor,a hybrid CRP propulsor adjoint method was studied based on the steady integral panel method.The adjoint equations of hybrid CRP propulsor were established, and the sensitive derivatives between thrust, torque coefficient, maximum negative pressure coefficient of profile, and pitch and camber of fore and aft propellers were calculated. According to the sensitive derivative results, a hybrid CRP propulsor was designed and optimized with the steady integral panel method. During the optimizing process,the thrust and torque of fore and aft propellers kept unchanged,and the cavitation performance were improved.The before and after hybrid CRP propulsor models were made,and a model test was carried out in cavitation tunnel.Results show that the blade tip cavitation area of optimized hybrid CRP propulsor could be significantly reduced, and the thrust and torque coefficient are unchanged,indicating that the adjoint method is effective in the optimization of hybrid CRP propulsor.