Full
Outline
The porous medium model is widely used in the research of fluid sealing leakage rate calculation due to its high accuracy.The application of porous medium models was introduced in the research of static and dynamic sealing mechanisms，and the establishment methods of various porous medium models as well as the advantages and disadvantages of different leakage rate calculation methods was summarized，the development direction of future porous media models was elucidated.In the study of static sealing mechanism，the establishment methods of porous medium models based on percolation grid model，statistical contact model and capillary bundle model were analyzed，and the application characteristics of Darcy equation，N-S equation and Hagen-Poiseuille equation in leakage rate calculation were compared.In the research on the mechanism of dynamic sealing，the process of establishing the basic model based on the continuity equation and the N-S equation was expounded，and the method of deriving the resistance coefficient with the aid of the Ergun equation and Chew theory was discussed.Studies show that the Darcy equation is the most widely used method for calculating leakage rate，while the N-S equation and the Hagen-Poiseuille equation are subject to certain limitations due to the complexity of the geometry of the flow channel.The method based on the Ergun equation for calculating the leakage rate is simple in form and highly accurate，while the results based on the Chew theory have wider adaptability.In subsequent research，the porous medium model should focus on the rapid prediction of leakage rate based on neural networks，providing reference for design of sealing structures.
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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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