流体自控振荡的机理及其对水环境维护的有益功能
发布时间：2018-11-27 13:01
【摘要】：从真实流体所具粘滞耗散特性出发,以数学解析法严谨地论证了淹没射流因沿程能量通量渐减,加以其动量通量沿程守恒,故其质量通量必然沿程递增,从而衍生出射流卷吸及附壁效应,于是,在专门设计的腔体中就会发生流控振荡现象.发生流控振荡的腔体的两个出口会交替地输出两股非共面动量通量射束并在其后形成顺流螺旋涡,在绕水平轴旋涡的流场中,重于水的沙粒将获得附加的悬浮功增量,而轻于水的气泡或藻菌团的上浮行动将受阻碍.前者会加大河流的挟沙能力,后者的影响将导致水藻所赖以滋长的光合能量锐减而枯萎,从而改善水质.
[Abstract]:Based on the viscous and dissipative characteristics of real fluid, the mathematical analytical method is used to prove that the submerged jet must increase its mass flux along the path because the energy flux of the submerged jet decreases gradually and the momentum flux is conserved along the path. Thus, the jet entrainment and wall attachment effect are derived, so the fluid-controlled oscillation will occur in the specially designed cavity. The two outlets of the cavity in which the fluid-controlled oscillation occurs will alternately output two non-coplanar momentum flux beams and then form a downstream spiral vortex. In the flow field around the horizontal axis vortex, the sand particles that are heavier than water will obtain additional suspended power increments. The floating action of bubbles or algae colonies lighter than water will be hindered. The former will increase the sediment carrying capacity of the river, and the latter will cause the photosynthetic energy on which algae grow to decline and wither, thus improving the water quality.
【作者单位】： 北京建筑大学土木与交通工程学院;北京建筑大学环境与能源工程学院;
【基金】：北京市自然科学基金(No.3952004)~~
【分类号】：X143
本文编号：2360878
[Abstract]:Based on the viscous and dissipative characteristics of real fluid, the mathematical analytical method is used to prove that the submerged jet must increase its mass flux along the path because the energy flux of the submerged jet decreases gradually and the momentum flux is conserved along the path. Thus, the jet entrainment and wall attachment effect are derived, so the fluid-controlled oscillation will occur in the specially designed cavity. The two outlets of the cavity in which the fluid-controlled oscillation occurs will alternately output two non-coplanar momentum flux beams and then form a downstream spiral vortex. In the flow field around the horizontal axis vortex, the sand particles that are heavier than water will obtain additional suspended power increments. The floating action of bubbles or algae colonies lighter than water will be hindered. The former will increase the sediment carrying capacity of the river, and the latter will cause the photosynthetic energy on which algae grow to decline and wither, thus improving the water quality.
【作者单位】： 北京建筑大学土木与交通工程学院;北京建筑大学环境与能源工程学院;
【基金】：北京市自然科学基金(No.3952004)~~
【分类号】：X143
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1 孙厚钧;高军;;用振荡射流抑制蓝藻滋长防止泥沙淤积[J];武汉大学学报(工学版);2009年06期
，本文编号：2360878
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