导流板式减涡器总压损失特性数值模拟

通过数值模拟的方法研究了不同形状的导流板式减涡器对总压损失特性的影响。结果表明,总压的损失主要由气体在减涡器中对导流板做功引起的平缓下降以及由于切向速度过大在转折处引起的迅速下降两部分组成。当导流板较长时,损失主要由气流对导流板做功导致,导流板较短时损失则主要由转折处突降导致。因此,应在起到限制切向速度以降低转折处的突降的同时,尽可能减少气流对导流板的做功。系统总压损失随导流板数量的增多和出口位置的提高呈现先减少后增大的趋势,导流板形状也会对总压损失造成影响。 

Numerical simulation of total pressure loss on vortex-reducer with bafflers

The effect of different vortex reducers with bafflers on the characteristics of total pressure loss was studied by numerical simulation. Results showed that the total pressure loss was composed of the slow decrease in the bafflers because of work and the sharp decrease of velocity at the turning point due to the excessive tangential velocity. The loss was mainly caused by the former with long bafflers and by the latter with short bafflers. It was significant to reduce the work done by flow to bafflers, whilelimiting the tangential velocity. The total pressure loss of the system decreased and then increased with the increase of the number of bafflers and the outlet position. The shape and length of the bafflers also affected the total pressure loss.