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CFD analysis of radiation impact on Stirling engine performance

机译：辐射对斯特林发动机性能影响的CFD分析

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The impact of radiative heat transfer on the performance of a beta-type Stirling engine with no regenerator was investigated numerically using ANSYS fluent 14.5 software. Two radiation models were tested, which are, namely, surface-to-surface 'S2S' and discrete ordinates 'DO'. The CFD model was validated against experimental data and the validation revealed an excellent agreement with the experimental data with a maximum deviation of 7%. On the other hand, the results revealed that ignoring radiative heat transfer results in underestimation of the power output by about 13% compared with the pertinent experimental data used for validation. Moreover, the simulation results of another geometry revealed an underestimation of the output power of about 18% for the case of ignored radiation effects compared with the results of the case with the radiation model considered. The experimentally validated model has been used to assess the engine performance using three different gases (Air, He and H-2) as working fluids. For each case, the performance is evaluated with three values of material emissivity (0.6, 0.8 and 1), and compared with the case where radiative heat transfer is ignored. It was found that DO radiation model is less expensive computationally and it is more accurate than S2S radiation model. It was shown that the radiative heat energy represents 9%-12% of the total supplied energy in the case where air gas is used depending on the surface emissivity. This percentage is reduced to 7%-9% for the case of He gas. While it didn't exceed 2% in the case of H-2 gas. Also, the results show that the power output changes proportionally with the surface emissivity in the case of air and He gases. While in the case of H-2 gas, the impact of surface emissivity can be ignored for all emissivity range under study.
机译：使用ANSYS fluent 14.5软件对辐射传热对不带蓄热器的β型斯特林发动机性能的影响进行了数值研究。测试了两个辐射模型，即面对面“ S2S”和离散坐标“ DO”。针对实验数据对CFD模型进行了验证，验证结果显示与实验数据的一致性极佳，最大偏差为7％。另一方面，结果表明，与用于验证的相关实验数据相比，忽略辐射传热会导致功率输出低估约13％。此外，与考虑辐射模型的情况相比，在忽略辐射效应的情况下，另一种几何形状的仿真结果显示低估了大约18％的输出功率。经过实验验证的模型已用于使用三种不同的气体（空气，He和H-2）作为工作流体来评估发动机性能。对于每种情况，均使用三个材料发射率值（0.6、0.8和1）评估性能，并与忽略辐射热传递的情况进行比较。发现DO辐射模型的计算成本较低，并且比S2S辐射模型更准确。结果表明，根据表面发射率，在使用空气的情况下，辐射热能占总供应能量的9％-12％。对于氦气，该百分比降低到7％-9％。对于H-2气体，其含量不超过2％。而且，结果表明，在空气和氦气的情况下，功率输出与表面发射率成比例地变化。对于H-2气体，在所研究的所有发射率范围内，都可以忽略表面发射率的影响。

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