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In the field of space launch, the filling system of liquid oxygen relates to whether launch mission is successful or not, so the measurement of flow velocity for liquid oxygen is crucial. The vortex flow meter is often used as its measuring instrument due to its advantages such as stable performances and wide ranges. It is found that the vortex street coefficients of vortex flow meter show different characteristics at low and high flow velocities through experimental simulation so that the precision of vortex flow meter is poor at low flow velocities. In order to explore the change characteristics of vortex street coefficient for vortex flow meter at low and high flow velocities, the simulation experiment of vortex street flow field with flow velocity of 1.0~10.5 m/s at inlet is carried out as well as the relational graph of vortex street frequency and inlet velocity is obtained. Moreover, the fitting curve of vortex street frequency and vortex street coefficient is obtained through fitting curve. Finally, it is found that the fluid flow velocity obtained by curve fitting is more accurate through calculating flow velocity with the obtained vortex street coefficient curve and average coefficient.
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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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