混合式CRP吊舱推进器水动力性能数值模拟及试验

建立混合式CRP吊舱推进器数值模型并置于数值空泡水洞内,结合RANS方程和SST k-ω湍流模型,运用滑移网格方法对混合式CRP吊舱推进器在均匀流场中水动力性能进行了数值模拟,得到了敞水性能预报结果,并分析了混合式CRP推进器的非定常力;同时,利用空泡水洞、吊舱动力仪及长轴动力仪对混合式CRP吊舱推进器敞水性能进行了试验研究,通过3组重复性试验表明了试验方法的稳定性;并将3组试验平均值与将数值模拟所得的敞水性能结果进行了比较,彼此吻合较好。结果表明,本文所用试验方法和数值计算方法对吊舱推进器模型敞水特征的预报具有较高的可信度,能达到工程应用要求的要求;和国外学者在空泡水洞内得到的不附带吊舱相同对转桨敞水试验数据进行比较,分析了吊舱对前后桨敞水性能的影响。结果表明,吊舱对前桨的敞水性能基本没有影响,但对后桨的敞水性能影响显著。

Numerical Simulation and Experimental Investigation on Hydrodynamics Performance of Hybrid CRP Podded Propulsion

Numerical model of hybrid contra-rotating propeller(CRP) podded propulsion is built in numerical cavitation tunnel,and the hydrodynamics performance of hybrid CRP podded propulsion in uniform flow is predicted by RANS formula with SST k-ω turbulence model based on sliding mesh method.The predicted results of open-water performance and unsteady performance of hybrid CRP podded propulsion are analyzed.Synchronously,a series of experimental investigations for open-water performance of hybrid CRP podded propulsion are carried out.Pod dynamical instrument and long-axis dynamical instrument are used in cavitation tunnel of the same size.The repeated tests’ results are compared well with each other,indicating that the tests are stable.The average value of the repeated tests’ results agree well with the prediction results of open-water performance.It is shown that the experimental method and the numerical method presented in this paper have good precision in the prediction of hybrid CRP podded propulsion’s open-water performance.The average value of the repeated tests’ results and predicted results are compared with the foreign experimental value of the same CRP without pod.The influence of pod on the openwater performance of the forward propeller and the after one are analyzed.It is shown that pod has no influence basically on open-water performance of the forward propeller,but has an obvious influence on the after one.