【摘要】：為研究低亞臨界雷諾數(shù)Re情況下錯(cuò)列角度θ對(duì)不等直徑雙柱體繞流特性的影響,利用Fluent軟件模擬了Re為3 900、間距比G/D為2.0、直徑比D/d為0.5、θ=0°~180°之間9種角度的繞流過程,得到了流場(chǎng)渦量圖、斯特魯哈數(shù)St_1和St_2、平均阻力系數(shù)C_(d1)和C_(d2)以及平均升力系數(shù)C_(l1)和C_(l2)。研究結(jié)果表明,隨著θ的從小到大,St_1先增大后減小,且在θ=30°和180°時(shí)有兩個(gè)值,St_2在θ=120°~150°時(shí)明顯小于其它角度;C_(d1)和C_(d2)的整體趨勢(shì)都是先增大后減小,C_(l1)在θ=150°時(shí)取得極大值,C_(l2)在θ=30°時(shí)取得極小值。θ=0°時(shí),兩柱后方有單一渦脫落形態(tài);θ=30°時(shí),小柱后方有穩(wěn)定漩渦脫落產(chǎn)生,大柱后方渦脫落受到干擾,且大柱有兩個(gè)渦脫落頻率;θ=45°~90°時(shí),在間隙流的作用下,兩柱后方均有漩渦脫落,尾流中有兩列渦街;θ=120°~180°時(shí),大柱后有穩(wěn)定漩渦脫落,小柱渦脫落受到抑制。研究結(jié)果可為相關(guān)海洋工程設(shè)計(jì)提供參考。
[Abstract]:In order to study the effect of misalignment angle 胃 on the flow around two cylinders with different diameters in the case of low subcritical Reynolds number (Re), the Re is 3 900, the spacing ratio is 2.0, and the diameter ratio D is 0.5, using Fluent software to simulate the effect of 胃 on the flow around a two-cylinder body with different diameters in the case of low sub-critical Reynolds number. The vorticity diagram of the flow field, the average drag coefficients C _ (d _ 1) and C _ (d _ 2) of St_1 and St_2, and the average lift coefficients C _ (l _ 1) and C _ (L _ 2) of the flow field at 9 angles between 胃 = 0 擄~ 180 擄are obtained. The results show that with the increase of 胃, St_1 increases first and then decreases, and there are two values at 胃 = 30 擄and 180 擄. The St_2 is obviously smaller than other angles when 胃 = 120 擄~ 150 擄. The overall trend of C _ (d _ 1) and C _ (d2) is increasing first and then decreasing. C _ (l _ 1) reaches a maximum at 胃 = 150 擄, and C _ (l _ 2) reaches a minimum value at 胃 = 30 擄. When 胃 = 0 擄, there is a single vortex shedding form behind the two columns. When 胃 = 30 擄, there are steady vortex shedding behind the column, the vortex shedding behind the column is disturbed, and there are two vortex shedding frequencies in the column, when 胃 = 45 擄~ 90 擄, there are vortex shedding in the rear of the two columns and two vortex streets in the wake, when 胃 = 45 擄~ 90 擄, there is a vortex shedding in the rear of the two columns, and there are two vortex streets in the wake. When 胃 = 120 擄~ 180 擄, there are steady vortex shedding behind the large column, and the small column vortex shedding is restrained. The results can be used as reference for the design of marine engineering.
【作者單位】： 中國(guó)海洋大學(xué)工程學(xué)院;
【基金】：山東省重點(diǎn)基金資助項(xiàng)目(ZR2013EEZ002)
【分類號(hào)】：O357.5

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