Numerical simulation of heat transfer for exhausted gases jet impinging
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摘要: 针对射流传热问题，利用基于RNGk-ε湍流模型的数值方法模拟了射流垂直冲击平板的流动过程，并与实验数据比较，验证了模型的可行性。在此基础上，以火箭喷管入口参数为入口条件，建立了超音速燃气射流垂直冲击平板和冲击浸没平板的计算模型，分析了不同冲击条件下努塞尔数分布规律和温度分布规律, 论述了超音速射流传热的特性及影响传热特性的因素。得到了冲击距离为(14~18)D的努塞尔数取值范围，并表明冲击距离和射流温度是影响传热效率的关键因素；冲击距离增加，传热效率降低，冲击平板表面的射流温度越高，传热效率越高。
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关键词:
- 流体力学 /
- 射流传热 /
- RNGk-ε湍流模型 /
- 浸没平板 /
- 努塞尔数
Abstract: To the case of heat transfer, the flowing process of jet flow impacting on a plate vertically is simulated by employing RNGk-ε turbulence model, which is compared with the experimental data, to verify the feasibility of the model. Based on the simulating results, the models of the impact of supersonic jet flow on plate vertically and on submerged plate are built respectively by considering the parameters of rocket nozzle entrance as the inlet conditions. In addition, the distributions of the Nusselt number and temperature are calculated under different impacting conditions. Moreover the characteristics and factors of supersonic jet flow heat transfer are analyzed. The results show the range of Nusselt number under different impacting distances are between 14D and 18D, and reflect that the impacting distance and jet flow temperature are the key factors which influence the heat transfer rate. Furthermore, when the impacting distance increases, the heat transfer rate decreases. In contrast, the higher the temperature of jet flow on the plate is, the greater the efficiency of heat transfer is. -
图 4 超音速射流垂直冲击平板的努塞尔数分布
Figure 4. Nusselt number distribution in vertical plate impinged by supersonic jet flow
图 5 在距垂直平板0.5 mm截面的温度分布
Figure 5. Temperature distribution of the section which is 0.5 mm away from the impinged plate
图 6 浸没平板顶端面的努塞尔数分布
Figure 6. Nusselt number distribution on top surface of submerged plate
图 7 浸没平板顶端面的射流温度分布
Figure 7. Temperature distribution on top surface of submerged plate
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