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On the optimization of 3D-flow and heat transfer by using the Ice Formation Method: Vane endwall heat transfer

机译:用冰形成方法优化3D流动和传热:叶片端壁传热

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摘要

Technical flow devices are usually optimized by using numerical algorithms that analyze a multitude of design variants for the flow restraining geometry until an optimum solution is found. In this paper, we present an alternative approach: the Ice Formation Method (IFM). We show the application of this method to a turbine vane endwall in order to optimize the endwall with respect to heat transfer. On the basis of a flat endwall, we first created ice-contoured endwalls in our water channel test facility. We then analyzed these contours using numerical simulations with air to approve them for the working medium of gas turbines. Results show that the IFM reliably creates contours with reduced heat transfer coefficients (HTC). In this vein, we created one contour that reduces the average HTC by 5.2% compared to the baseline. Analyzing this contour revealed that it adapts to the flow field by breaking up the near endwall vortices and thus reducing secondary flows. We found that this reduction in HTC results from the natural character of the IFM to reduce entropy production rates due to heat conduction.
机译:通常,通过使用数值算法来优化技术流量设备,该算法分析流量限制几何形状的多种设计变体,直到找到最佳解决方案为止。在本文中,我们提出了一种替代方法:制冰方法(IFM)。我们展示了此方法在涡轮叶片端壁上的应用,以优化与传热有关的端壁。在平坦端墙的基础上,我们首先在水道测试设施中创建了冰面轮廓端墙。然后,我们使用空气进行数值模拟来分析这些轮廓,以将其批准用于燃气轮机的工作介质。结果表明,IFM可靠地创建了具有降低的传热系数(HTC)的轮廓。在这种情况下,我们创建了一个轮廓,与基线相比,该轮廓将平均HTC降低了5.2%。分析该轮廓线表明,它通过破坏近端壁涡旋而适应流场,从而减少了二次流。我们发现HTC的这种降低是由于IFM的自然特性所致,以降低由于导热引起的熵产生速率。

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