Method for cooling and discharging high-temperature tail gas of aircraft APU in ultralow-temperature environment in laboratory

Abstract

The invention discloses a method for cooling and discharging high-temperature tail gas of an aircraft APU in an ultralow-temperature environment in a laboratory. The method comprises the steps: 1, performing fan type selection; 2, giving a safe set temperature for high-temperature tail gas emission of the APU of the airplane; 3, determining the heating temperature of the electric tracing band; 4, estimating the mass flow rate of water for spraying and cooling; 5, primarily cooling and discharging the high-temperature tail gas of the aircraft APU; 6, tail gas emission temperature detection and adjustment; and 7, continuously cooling and discharging the high-temperature tail gas of the aircraft APU. The laboratory exhaust port temperature sensor, the laboratory environment temperature sensor and the laboratory environment pressure sensor are used for detecting whether the indoor environment is balanced or not under the APU driving condition, then the fan type meeting the requirement is selected, it is guaranteed that the temperature and pressure in a laboratory are stable, the safety of aircrafts and testers is guaranteed, the heating temperature of the electric tracing band is determined, the water supply pipe is effectively prevented from being frozen and blocked, and the stability is still achieved in an ultralow-temperature environment in a laboratory.

Description

technical field [0001] The invention belongs to the technical field of APU drainage and exhaust cooling during the opening process of an aircraft APU in a closed laboratory, and specifically relates to a method for cooling and discharging an aircraft APU high-temperature exhaust gas in a laboratory at an ultra-low temperature environment. Background technique [0002] To carry out climate experiments in the full-aircraft climate laboratory, it is necessary to turn on the aircraft APU to provide power for the aircraft. If the high-temperature and high-pressure exhaust gas discharged by the APU is directly discharged into the laboratory, it will not only destroy the temperature and pressure environment in the laboratory, but also accumulate in the laboratory, which will also pose a threat to the safety of the laboratory, the aircraft and even the test personnel. Therefore, when the aircraft APU is turned on in the laboratory, the exhaust gas needs to be discharged outside the ...

AI Technical Summary

Problems solved by technology

If the high-temperature and high-pressure exhaust gas discharged by the APU is directly discharged into the laboratory, it will not only destroy the temperature and pressure environment in the laboratory, but also accumulate exhaust gas in the laboratory, which will also pose a threat to the safety of the laboratory, aircraft and even test personnel.

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