The test results of sealing performance and a comparison between three types of honeycomb seals and a type of labyrinth seal are presented, which have different seal clearances and work under various rotor speeds. It ...The test results of sealing performance and a comparison between three types of honeycomb seals and a type of labyrinth seal are presented, which have different seal clearances and work under various rotor speeds. It has been found that the honeycomb seal leakage during a rotor speed of 6000 r/min decreases by about 4.8 percent as compared with that during a rotor speed of 0 r/min. At a radial clearance of 0.12 mm the honeycomb seal with a cell size of 1.6 mm enjoys the best sealing performance. The leakage flow of the labyrinth seal with a radial clearance of 0.06 mm is smaller than that of the honeycomb seals.展开更多
The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex...The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex systems that have their respective scientific problems,such as metal dendrite forming/deforming,the kinetics of redox mediators for oxygen reduction/evolution reactions,high overpotentials,desolution of CO_(2),H_(2)O,etc.from the air and related side reactions on both anode and cathode.It should be the main direction to address these shortages to improve performance.Here,we summarized recently research progress in these metal-air/O_(2) batteries.Some perspectives are also provided for these research fields.展开更多
基金National Emphases Basis Research Development and Programming Project(G1999022304)
文摘The test results of sealing performance and a comparison between three types of honeycomb seals and a type of labyrinth seal are presented, which have different seal clearances and work under various rotor speeds. It has been found that the honeycomb seal leakage during a rotor speed of 6000 r/min decreases by about 4.8 percent as compared with that during a rotor speed of 0 r/min. At a radial clearance of 0.12 mm the honeycomb seal with a cell size of 1.6 mm enjoys the best sealing performance. The leakage flow of the labyrinth seal with a radial clearance of 0.06 mm is smaller than that of the honeycomb seals.
基金supported by the National Basic Research Programme of China (2021YFB3800301)the National Natural Science Foundation of China (21633003 and U1801251)Science,and Technology Innovation Fund for Emission Peak and Carbon Neutrality of Jiangsu Province (BK20220034)。
文摘The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex systems that have their respective scientific problems,such as metal dendrite forming/deforming,the kinetics of redox mediators for oxygen reduction/evolution reactions,high overpotentials,desolution of CO_(2),H_(2)O,etc.from the air and related side reactions on both anode and cathode.It should be the main direction to address these shortages to improve performance.Here,we summarized recently research progress in these metal-air/O_(2) batteries.Some perspectives are also provided for these research fields.
