发表机构
Hakim Sabzevari University; Ferdowsi University of Mashhad（哈基姆萨布泽瓦里大学; 马什哈德 Ferdowsi 大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过数值模拟对比Clark-Y水翼的5个弦向微射流位置，发现提升平均水动力性能的位置与降低非定常载荷的位置存在权衡关系，优选位置需依研究目标而定。
AI 中文摘要
预设切向微射流注入可改变云空化动力学，但提升平均水动力性能的弦向位置与最小化非定常载荷的位置可能存在差异。本研究在雷诺数Re=7×10^5、空化数0.8的条件下，对比了Clark-Y水翼上5个射流位置（x/c=0.15、0.30、0.45、0.60、0.70）的表现。采用带Volume-of-Fluid格式与Schnerr-Sauer空化模型的瞬态大涡模拟构建二维参数框架，同时纳入一个代表性三维案例以展示展向空泡变形。分析内容包括蒸汽拓扑结构、湍动能、速度与压力场、周期平均表面压力、水动力载荷、载荷波动、频谱及空泡厚度历史。x/c=0.15处的射流在测试案例中获得最高周期平均升阻比：阻力从0.137降至0.107，升阻比从5.693提升至6.261，升力从0.78降至0.67；相比之下，x/c=0.60处的射流获得最低的载荷波动均方根值，升力与阻力系数的均方根值分别约为0.112与0.0165。因此，优选射流位置取决于研究目标：在当前条件下，利于平均水动力性能的位置与利于降低非定常载荷的位置并不重合。
英文摘要
Prescribed tangential micro-jet injection can modify cloud-cavitation dynamics, but the chordwise location that improves mean hydrodynamic performance may differ from the location that minimizes unsteady loading. This study compares five injection locations (x/c = 0.15, 0.30, 0.45, 0.60, and 0.70) on a Clark-Y hydrofoil at Re = 7 x 10^5 and cavitation number 0.8. Transient large-eddy simulation with a Volume-of-Fluid formulation and the Schnerr-Sauer cavitation model is used in a two-dimensional parametric framework, with one representative three-dimensional case included to illustrate spanwise cavity deformation. The analysis considers vapor topology, turbulent kinetic energy, velocity and pressure fields, cycle-averaged surface pressure, hydrodynamic forces, force fluctuations, spectra, and cavity-thickness histories. Injection at x/c = 0.15 gives the highest cycle-averaged lift-to-drag ratio among the tested cases: drag decreases from 0.137 to 0.107 and the lift-to-drag ratio increases from 5.693 to 6.261, while lift decreases from 0.78 to 0.67. In contrast, x/c = 0.60 gives the lowest recorded force-fluctuation RMS, with lift- and drag-coefficient RMS values of about 0.112 and 0.0165. The preferred injection location is therefore objective-dependent: the location favored by mean hydrodynamic performance does not coincide with the location favored by unsteady-load reduction under the present conditions.
Comments39 pages, 16 figures, 3 tables
