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Supercritical water coal gasification for hydrogen production is a clean and efficient power generation technology. Based on entropy generation theory, numerical investigation on the non-equilibrium condensation flow of an H2O/CO2 mixed working fluid in the final-stage cascade is conducted. The losses are quantified by identifying regions within the cascade where different types of losses occur and calculating the entropy generation in each region. The mechanisms behind the impact of back pressure and CO2 mass fraction in the mixed fluid changes on various losses and entropy generation sources are analyzed. The effects of these parameters on the loss distribution are explored, including a detailed description of how shock waves influence wake losses and the entropy generation distribution within the boundary layer. The results show that wall losses, wake losses, and boundary layer losses consistently account for over 90% of the total losses under different operating conditions. The main sources of entropy generation are wall dissipation, direct dissipation, and turbulence dissipation. When the back pressure increases by 5.03 kPa, the total loss decreases by 31.73%. However, when the CO2 mass fraction in the mixed fluid increases by 40%, the total loss increases by 4.71%. The variation in turbulent dissipation entropy generation within the wake loss is the primary cause of the total loss change and is closely linked to the velocity gradients in the flow field. This study offers significant insights for the loss analysis of the wet steam region in mixed medium steam turbines and for aerodynamic optimization.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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