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A large-scale low-speed wind tunnel turbofan aircraft dynamic simulation test system is established to accurately obtain the dynamic influence of turbofan engine intake and exhaust on the aircraft, providing technical support for the refined development of military and civil turbofan aircraft in China. The technology of internal air bridge balance is one of the core technologies in the test system. The turbine powered simulator (TPS) needs to be driven by high-pressure gas. The stiffness of the high-pressure gas supply pipeline and the high-pressure gas flowing through the fixed end to the measuring end of the balance will bring great measurement interference to the balance, and then affect the force measurement accuracy of wind tunnel test. It is necessary to weaken the rigidity of the high-pressure air supply pipeline and eliminate the interference of air supply. Eliminating or weakening the interference load caused by the air supply pipeline and high-pressure air supply flowing through the pipeline on the balance force measurement is a necessary prerequisite to ensure that high-precision test data can be obtained. In this study, a new type of air bridge disturbance elimination unit structure is proposed. The technical research on the design mechanism and calibration correction of the influence of air bridge stiffness,air supply pressure, air supply temperature and air supply flow on the force measurement interference of the balance is carried out. The final test results show that the corresponding technical indicators of the internal air bridge balance meet the expectations and can meet the needs of turbofan aircraft dynamic simulation wind tunnel test.
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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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