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首页> 外文会议>ASME Turbo Expo >Computation of Flow and Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=1:1, AR=1:2, AR=1:4) with 45-Deg Angled Ribs by a Reynolds Stress Turbulence Model
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Computation of Flow and Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=1:1, AR=1:2, AR=1:4) with 45-Deg Angled Ribs by a Reynolds Stress Turbulence Model

机译：通过雷诺应力湍流模型，双通旋转矩形通道（Ar = 1：1，Ar = 1：2，Ar = 1：4）中的流动和传热在旋转矩形通道（Ar = 1：1，ar = 1：4）中的流动和传热。通过Reynolds应力湍流模型，具有45°角的肋骨

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Numerical predictions of three-dimensional flow and heat transfer are presented for rotating two-pass rectangular channel with 45-deg rib turbulators. Three channels with different aspect ratios (AR=1:1; AR=1:2; AR=1:4) were investigated. Detailed predictions of mean velocity, mean temperature, and Nusselt number for two Reynolds numbers (Re=10,000 and Re=100,000) were carried out. The rib height is fixed as constant and the rib-pitch-to-height ratio (P/e) is 10, but the rib height-to-hydraulic diameter ratios (e/D{sub}h) are 0.125, 0.094, and 0.078, for AR=1:1, AR=1:2, and AR=1:4 channel, respectively. The channel orientations are set at 90 deg, corresponding to the cooling passages between mid-portion and the leading edge of a turbine blade. The rotation number varies from 0.0 to 0.28 and the inlet coolant-to-wall density ratio varies from 0.13 to 0.40, respectively. The primary focus of this study is the effect of the channel aspect ratio on the nature of the flow and heat transfer enhancement in a rectangular ribbed channel under rotating conditions. A multi-block Reynolds-averaged Navier-Stokes (RANS) method was employed in conjunction with a near-wall second-moment turbulence closure to provide detailed resolution of the Reynolds stresses and turbulent heat fluxes induced by the rib turbulators under both the stationary and rotating conditions.
机译：提出了一种用45°肋骨湍流旋转双通矩形通道的三维流动和传热的数值预测。研究了不同纵横比的三个通道（Ar = 1：1; ar = 1：2; ar = 1：4）。进行两个雷诺数（RE = 10,000和RE = 100,000）的平均速度，平均温度和何时何种速度的详细预测。肋高度固定为恒定，肋间距到高度比（P / E）为10，但肋高度到液压直径比（E / D {Sub} H）为0.125,0.094和0.078，对于Ar = 1：1，Ar = 1：2，AR = 1：4通道。通道取向设置在90°，对应于涡轮叶片的中间部分和前缘之间的冷却通道。旋转数在0.0至0.28之间变化，进口冷却剂 - 壁密度比分别从0.13变化。该研究的主要焦点是通道纵横比对旋转条件下矩形肋道通道中的流动和传热增强性质的影响。的多嵌段雷诺平均的Navier-Stokes结合被采用（RANS）方法用一个近壁二阶矩湍流闭合以提供雷诺应力的详细分辨率和湍流热通量下两个固定感应由肋湍流器和旋转条件。

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