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| Analysis of Influencing Factors of Discharging Civil Aircraft APU High Temperature Exhaust Gas from Climatic Laboratory |
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| DOI：10.7643/issn.1672-9242.2022.11.010 |
| KeyWord:APU, high temperature exhaust gas, climatic environmental test chamber |
| Author | Institution |
| MA Jian-jun |
Aircraft Strength Research Institute of China, Xi'an , China |
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| Abstract: |
| This research aims to carry out start-up and working tests under extreme climatic environments for civil aircraft APU in the climate laboratory, and establish a method for the safe discharge of APU high-temperature exhaust gas.CFD simulation method was used to systematically analyze and study the feasibility and influencing factors of using exhaust pipes to discharge APU high-temperature exhaust gas from the climate laboratory, including pipe diameter, distance, and back pressure.When the inlet of the exhaust pipe is too close to the outlet of the APU, it will facilitate the APU exhaust. The ejection ratio ε is linearly related to the outlet pressure Pex of the exhaust pipe and the diameter D of the exhaust pipe. The exhaust temperature tex is inversely proportional to the pipe diameter D. Furthermore, setting a smooth convergence section at the entrance of the exhaust pipe is beneficial to eliminate eddy currents, reduce the degree of negative pressure, and increase the ejection ratio within a certain range.In conclusion, it is feasible to adopt pipeline passive exhaust:A suitable exhaust pipeline design is D/d=2.0, L/d=1.5, and a smooth convergence section is set at the inlet of the pipeline. |
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