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Investigation on Mechanism of Altitude Characteristic for Air-breathing Pulsed Laser Thruster

Chinese Journal of Aeronautics 2010年第1期23卷 33-38页

作者： Hong Yanji,Wen Ming,Cao Zhengrui Department of Basic Theories,Academy of Equipment Command & Technology,Beijing 101416,China Department of Basic Theories Academy of Equipment Command & Technology Beijing 101416 China

Altitude characteristic is of great importance for studying when an air-breathing pulsed laser thruster works in the dense atmosphere condition of 0-30 km altitude. The experimental findings all over the world show that the similar relationship between impulse coupling coefficient and altitude. According to strong explosion theory and an ideal gas model,a dimensionless factor indicating energy law of similitude is introduced,and formula of impulse coupling coefficient is deducted. Then theoretical study of altitude characteristic is carried out and mechanism of altitude characteristic is further explained. The results indicate that there is a maximum value of impulse coupling coefficient if the dimensionless factor equals to 0.41 in theory, and whether the phenomena of maximum appear or not depends on the range of the dimensionless factor related to altitude. As to a conical nozzle with the fixed length of 120 mm, the relationship between the sonic velocity and the dimensionless factor causes the maximum phenomenon at the altitude of about 12.5 km,and maximum theoretical impulse coupling coefficient is also found in the experimental investigations. The mechanism of altitude characteristic for air-breathing pulsed laser thruster is discovered in this article, which will provide reference for further research on altitude characteristic.

关键词： laser propulsion air-breathing mode altitude characteristic dimensionless factor maximum phenomenon

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Experimental and Theoretical Studies on Desulfurization Efficiency of Dual-alkali FGD System in a RST Scrubber

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过程工程学报 2006年第5期6卷 718-723页

作者：莫建松吴忠标程常杰李福才官宝红赵伟荣 Department of Environmental Engineering Zhejiang University Zhejiang Tianlan Desulfurization and Dust-removal Co.Ltd.

The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray(RST)scrubber are investigated.A dimensionless factor,ε,is proposed in this study to predict desulfurization efficiency of this dual-alkali FGD system.ε represents the desulfurization ability of a dual alkali FGD system,determined by five main operating parameters such as sodium ion concentration,ratio of absorbent flow rate to flue gas flow rate,pH value of absorbent solution,ratio of sulfate ion to total sulfur ion in absorbent solution,and sulfur dioxide concentration of inlet flue *** empirical expression for predicting desulfurization efficiency at different temperatures is obtained through the experimental study and theoretical *** provides useful guide for engineering design.

关键词： desulfurization efficiency dimensionless factor dual-alkali FGD RST scrubber

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