关键词: 导流槽, 气升混合, 计算流体力学, 开放式跑道池, 藻池

Abstract: Aiming at the drawbacks with algae solution stratify and low density algae cells in the traditional raceway pond，this research designed a V-shape transparent flow guide groove to increase the surface-to-volume ratio and guide the flow，and simulated the influence on the velocity field distribution by the surface gradient of groove，solution depths and air inlet velocity using CFD method. The results showed that in the presence of airlift with the flow guided groove，the mixing area was expanded to the areas near lateral zones on both sides of the raceway pond，and formed a vertical flow cycle between the adjacent layers. The mixing and lighting conditions of the microalgae solution were improved，and the residence time of the carbon dioxide in the solution was also increased. The optimal design parameters were tan?=0.1，d=0.3 m，vair?in=0.1 m/s. Under the optimal conditions，the velocity field distributed evenly，and the mean velocity was suitable for preventing the wall attachment effects and sediment of the algae. In addition，the equipment energy consumption was relatively low.

Key words: flow guide groove, mixing by airlift, computational fluid dynamics, open raceway pond, algae pond