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基于全空化模型,提出了修正RNGκ-ε模型,并对NACA0015水翼的非定常空化流场进行了数值研究。基于标准RNGκ-ε模型和修正的RNGκ-ε模型,在8°和20°两种冲角及Re=3×10~5的条件下,针对不同空化数,分别预测了翼型周围的速度场、翼型表面的空穴形态以及非定常空化时空泡的演化过程。和试验结果对比,两个湍流模型都能较好地捕捉翼型周围的大空泡团,其中,标准的RNGκ-ε模型能较好捕捉翼型头部的空穴,修正的RNGκ-ε湍流模型能更好地模拟翼型表面的空穴形态、空泡脱落过程及其产生的回流。
Based on the full cavitation model, a modified RNG κ-ε model is proposed and the numerical study of the unsteady cavitation flow field of the NACA0015 hydrofoil is carried out. Based on the standard RNG κ-ε model and the modified RNG κ-ε model, the air velocities around the airfoils were predicted for different cavitation numbers at 8 ° and 20 ° angles of attack and Re = 3 × 10 ~ 5 Field, airfoil surface cavity morphology and the evolution of unscheduled cavitation bubble evolution. Compared with the experimental results, both turbulence models can capture the large cavities around the airfoils, and the standard RNGκ-ε model can better capture the airfoils in the airfoil. The modified RNGκ-ε turbulence model Can better simulate the airfoil surface morphology, vacuolar shedding process and the resulting backflow.