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Equalization and Primary Treatment
Published in David H.F. Liu, Béla G. Lipták, Wastewater Treatment, 2020
Ronald G. Gantz, Janos Lipták, David H.F. Liu
Flotation system performance depends not only on supplying sufficient gas for flotation but also on the manner in which gas is delivered to the flotation vessel. The pressurization system generally consists of a pressurization pump, a retention tank, and a gas supply. The pump increases wastewater pressure while the retention tank provides adequate time for gas to transfer into liquid and also for excess gas applied to the system to be released.
Improvement of marine slurry by vacuum preloading and air-booster via a reverse prefabricated vertical drain
Published in Marine Georesources & Geotechnology, 2022
Jianqi Wu, Xiang Liu, Xiang Luo, Hongtao Fu, Xiaobing Li, Ying Cai
Figure 12 shows a schematic diagram of the test device, which was mainly composed of a model barrel, vacuum system, measurement system, and pressurization system. The booster system was mainly composed of an air compressor and pressure regulating valve in Figure 13. During the tests, the valve connected to the air compressor was closed to ensure that vacuum pressure would not be lost. After pressurization, the valve connected to the air compressor was opened and the valve connected to the vacuum pump was closed to ensure that the pressure was only applied to the RPVD and that the vacuum was stopped during the pressurization process. The rest of the setup is the same as that for the above test. Second, the settlement measurement points during the test and the post-test measurement points for water content and vane shear strength were as shown in Figure 14.
Numerical Simulation and Analysis of Combustion Stability of Aero-Engine Using Machine Learning and IIoT
Published in IETE Journal of Research, 2022
Aero-engine is developing towards high speed, high efficiency, automation, reliability, and durability. Combustion chamber is one of the main parts of aviation gas turbine engine. It is a device that converts the chemical energy of combustion into heat energy of gas. It heats the high-pressure air after pressurization of compressor to the allowable temperature before the turbine, so as to enter the turbine and exhaust device for expansion and work [1]. Combustion instability not only affects the working stability of aero-engine but also causes the acoustic vibration coupling fatigue failure of the combustor flame tube thin-walled structure. At present, the turbocharging ratio of aero-engine has reached 40, and the inlet temperature of turbine has reached 1700°C. With the increase of turbine inlet temperature, the allowable maximum temperature deviation of hot spot and the allowable temperature distribution of combustor exit do not change from the ideal temperature distribution, so the requirement of combustor outlet temperature distribution is higher. If the average radial temperature of turbine inlet gas deviates from the ideal temperature distribution, the service life of turbine guide vane and rotor blade will be significantly affected. If the temperature distribution of gas exceeds the maximum value of ideal temperature distribution of only 30°C, the life of rotor blade will be reduced by half.
Emergency drug usage during flight and airline safety management for passengers
Published in Journal of Toxicology and Environmental Health, Part A, 2021
An aircraft has a pressurization device for adjusting air pressure in the cabin. As illustrated in Figure 1, oxygen saturation is prevented from dropping significantly until the partial pressure of oxygen (PaO2) in the artery falls below 60 mmHg, thereby protecting passengers from hypoxia to some extent. The air pressure in the cabin is maintained at a level similar to that at an altitude of 5000 to 8000 feet (1524 to 2438 m) (AMA (Aerospace Medical Association) 2008). This indicates that passengers can be transported to their destinations without presenting with physiological abnormalities, as the air pressure in the cabin is reduced by about 25% at this time. The air is rather dry in the airplane with approximately 10% to 20% humidity, and the in-flight temperature is maintained at approximately 23°C to 25°C (www.koreanair.com). However, for passengers in poor physical condition, small changes in air pressure might produce hypoxia, thereby worsening their conditions.