应用流体力学和工业通风原理，分析了罗茨中央真空吸尘系统的管网阻力特性；
Tube Web obstruction property of Roots central vacuum cleaning system is analyzed with fluid mechanics and industry ventilate principle.
设计并制作了管式烟气-空气热交换器，搭建了试验台系统，进行热工性能和空气侧阻力特性的研究。
Flue gas-air tube heat exchanger is designed and made, its test-bed system is put up, and the thermal property and resistance characteristic of air side are studied.
本文提出了船闸输水系统鹅颈管段的水流特性及阻力系数的试验结果。
This paper presents the experimental results of the flow characteristics and head loss coefficients of gooseneck section in lock filling and emptying systems.
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