Full
Outline
In view of a low temperature turbine expansion machine with excessive axial load and the insufficient performance study of the gap，firstly，the pneumatic design designed the pneumatic structure of the main structure of the gap，and then simulate the numerical simulation based on the simulation results.The results show that the presence of the impeller gap will change the flow field distribution within the roof gap，the impeller and the depth ratio of the gap，the impeller efficiency and power are reduced，and the axial force decreases.When the gap depth ratio of the gap is 0.3，the equal entropy efficiency decreases by 2.9% compared with 2.4% and the power，and the axial force is reduced by 38.1%.Meet the performance index.This study provides theoretical reference for the application of impeller with gap in low temperature turbine expander.
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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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