Through the discussion of the resistance properties of natural ventilation induced by wind force, a method of local pressure loss superposition was proposed to calculate the pressure loss. 探讨了风压作用下大开口的自然通风阻力特性,并提出了用局部损失迭加法来计算阻力损失,即认为通过建筑物的气流是由不同的突缩段和突扩段的组合。
Calculation of local pressure loss in steam heating pipes 蒸汽供热管道局部压力损失计算
Results show that local pressure loss of viscoelastic fluid, where non-uniformity of pore's cross section occurs, is much higher than that of viscous fluid without elasticity, and the greater the fluid's viscoelasticity is, the higher the local pressure loss is. 研究结果表明:黏弹性流体在孔隙变截面处的局部压力损失远高于相同流动条件下无弹性纯黏流体的局部压力损失;黏弹性越大,局部压力损失越大;
The high local pressure loss arising from the flow through pore with non-uniform cross section is one of the main reasons of unexpected high flow resistance of viscoelastic fluid percolating through porous media. 黏弹性流体在变截面孔隙中的高局部压力损失是导致其在多孔介质中渗流阻力异常高的重要原因之一。
Based on the basic theory of fluid mechanics, the classification of pressure loss of channels in hydraulic manifold block and the causes of local pressure loss were studied, and the methods of reducing local pressure loss were discussed. 3. 通过流体力学基本理论,分析了阀块流道的压力损失类型及局部压力损失的产生原因,提出了降低局部压力损失的方法策略。