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Outline
To address the problem of excessive time cost when adopting fluid-structure interaction CFD simulations to study the effect of low‑temperature characteristics of boil‑off gas （BOG） on screw compressor efficiency，this study establishes a numerical model of a twin‑screw compressor using MATLAB.The PDE toolbox is employed to calculate the temperature distribution and thermal deformation of the screw rotors.The new clearance caused by rotor deformation is then incorporated into the numerical model to obtain the compressor efficiency considering rotor deformation.The computation time of this process is approximately 1/100 of that required for CFD simulations，greatly reducing the time cost.The numerical results were compared with those from an experimentally validated CFD model，and the errors in volumetric efficiency and isentropic efficiency were both within 3%.Furthermore，a low‑temperature intake test rig was constructed to measure volumetric efficiency at different intake temperatures.The maximum error between the measured data and the numerical results was within 5%，thereby verifying the reliability of the model.Based on the model，the influence of rotational speed on compressor performance was analyzed.The results show that as the rotational speed increases from 4 000 r/min to 10 000 r/min，the volumetric efficiency rises from 55.1% to 73.2%.The isentropic efficiency first increases and then decreases with rotational speed，reaching a maximum value of 62.2% at 8 000 r/min.This model can quickly and accurately predict the performance of the BOG twin‑screw compressor under various operating conditions，providing a reference for the efficiency design and optimization of high‑speed twin‑screw compressors.
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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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