【摘要】：為了進(jìn)一步探究繞三維扭曲水翼空化流動(dòng)結(jié)構(gòu)的非定常演變特性,基于均質(zhì)流模型,采用大渦模擬(LES)方法,并耦合Zwart空化模型對(duì)繞扭曲水翼(NACA0009)的非定�？栈鲃�(dòng)進(jìn)行了數(shù)值計(jì)算。結(jié)果表明:與試驗(yàn)結(jié)果對(duì)比發(fā)現(xiàn),該數(shù)值計(jì)算方法可以很好地捕捉到繞NACA0009水翼的非定�？张菪螒B(tài)的演變過程,且計(jì)算得到的水翼升力系數(shù)的時(shí)均值及其特征頻率均與實(shí)驗(yàn)值吻合較好。非定�？张莸拿撀溥^程分為主脫落和二次脫落兩個(gè)階段,主脫落過程表現(xiàn)為大尺度空泡團(tuán)的斷裂,呈U型結(jié)構(gòu)卷起并脫落,此時(shí)水翼表面的附著空泡呈凹形結(jié)構(gòu)。隨著時(shí)間的推移,附著空泡的兩側(cè)發(fā)生小尺度空泡團(tuán)的二次脫落,產(chǎn)生局部高壓,抑制了當(dāng)?shù)乜张莸纳L(zhǎng)速度,從而使附著空泡由凹形結(jié)構(gòu)逐漸發(fā)展為凸形結(jié)構(gòu)。
[Abstract]:In order to further investigate the unsteady evolution characteristics of cavitation flow structures around three dimensional twisted hydrofoil, a large eddy simulation (les) method is used based on homogeneous flow model. The unsteady cavitation flow around the twisted hydrofoil (NACA0009) is numerically calculated by coupled Zwart cavitation model. The results show that compared with the experimental results, the numerical method can capture the evolution of the unsteady cavitation morphology around the NACA0009 hydrofoil. The calculated time mean value and characteristic frequency of the hydrofoil lift coefficient are in good agreement with the experimental data. The abscission process of unsteady cavitation can be divided into two stages: main falling off and secondary falling off. The main shedding process is the fracture of large scale cavitation, which is U-shaped structure rolling and shedding, and the attached cavitation on the surface of the hydrofoil is concave. With the passage of time, the secondary shedding of small scale cavitation occurred on both sides of the attached cavitation, resulting in local high pressure, which inhibited the growth rate of the local cavitation and gradually developed from concave structure to convex structure.
【作者單位】： 南京理工大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)(30916011333) 江蘇省自然科學(xué)青年基金(BK20150764)資助
【分類號(hào)】：TV131.32

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