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| 1 | Effect of Cooling Water Flow Path on the Flow and Heat Transfer in a 660 MW Power Plant Condenser显示文摘The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement. | ZHONG Dawen MENG Ji'an QIN Peng QIU Xiaolong JIANG Ping LI Zhixin YUAN Fang | 2019 | Journal of Thermal Science2019，28，2： | 3 |
| 2 | 排汽缸出口汽流对喉部流场影响的数值分析显示文摘为了研究排汽缸出口汽流对喉部流场的影响,运用Fluent软件基于Spalart-Allmaras单方程模型对600 MW机组凝汽器喉部进行数值模拟,结果显示,考虑排汽缸来流,喉部流场变得更加复杂,与单独对喉部模拟时均匀来流的情况相比,两者的流场存在很大的差异。通过分析排汽缸出口处的流场,发现在喉部进口处装设栅板能起到改善流场的作用,喉部总压损失明显减小。 | 史啸曦 黄俊 陈健 | 2013 | 电力科学与工程2013，29，7： | 1 |
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