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Plenty of desert brush grows in the north of China. Brush does not only have great influence on ecology, which serves for conserving soil and water and checking winds and fix drifting sand, but also have great benefits on economy, which serves as energy forest, raw material forest and forage forest. In order to solve the problem of cutting brush in sandy area in north of China, a self-propelled walking...
Bush is one of raw material for biomass fuel in China. Crank speed is an important parameter in the design of bush reciprocating cutter. A reciprocating single blade cutting test equipment was made in this paper. One factor test was done to study its influence on maximum cutting force of bush. Other tests were done to study the interaction of cutting edge angle and crank speed, as well as sliding...
Axial-flow axial fan is used as fire fighting parts in the axial-flow pneumatic extinguisher. The shape of axial impeller is the key factor affecting the internal flow field structure of fire-fighting fan, outlet total pressure and flow velocity. In order to understand the flow pattern of axial-flow fire-fighting fan thoroughly, according to N-S equations and k-?? turbulence model, the internal three-dimensional...
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