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In order to solve the problem of the leakage of the flat tube of the all-aluminum low-temperature water tank in the thermal shock test, this article proposes 3 design adjustments, namely, widening the flat tube, changing the O-type collector tube and adding the spacer plate. Finite element analysis software Abaqus is used on the original design scheme and all-aluminum low-temperature water tank under 3 kinds of adjustment scheme for Finite Element Analysis (FEA) analysis, to get the maximum local stress of the flat tube at the leakage area and the maximum plastic strain and its distribution. Thermal shock bench tests are conducted using thermal shock life and the number and location of flat tube leaks as indicators. The results show that the thermal shock life is inversely proportional to the maximum local stress and plastic strain. The location of the leaking flat pipe of the test piece is consistent with the local stress and plastic strain distribution pattern, and the FEA simulation analysis is in good agreement with the test verification. Therefore, in order to extend the thermal shock life of the all-aluminum low temperature water tank, the program sequence is optimized as follows: use of O-type collector tubes, use of narrow flat tubes and use of double bulkheads.
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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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