Influence of flow straightener structure on fluid hydraulic performance within diversion type fire fighting water cannon
FANG Zheng1, XIANG Li1, LE Dangjiu1, LI Haozhu1, TANG Juejing1,SHEN Leihu2, LI Dong 2*,ZHAO Chuanwen2
1. East China Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Shanghai 200001, China; 2. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, Jiangsu 210046, China
Abstract：In order to investigate a new and optimal structure form of star flow straightener, this paper selects six-ribbed star stabilizer and designs five different lengths of star stabilizer with cross arrangement. Numerical simulations based on CFD were carried out for five types of diversion fire fighting water cannon with different structures of flow straighteners. The effect of flow straightener structure on the turbulent energy and axial velocity of the fluid in the fire fighting water cannon was analyzed. And the pressure drop under different arrangement forms was also analyzed. It shows that the installation of flow straighteners could improve the axial velocity distribution and reduce the turbulent energy of the inlet and outlet of the fire cannon, and the forked-row arrangement of flow straighteners could significantly improve the flow stabilization effect. Among them, the combination of 2, 40 mm long and crossed flow stabilizers is the most favorable to improve the comprehensive performance of the fire figh-ting water cannon. Under the same volume condition, it is limited to improve the performance of the fire fighting water cannon by shortening the length of the stabilizer and increasing the number of fork rows in the flow stabilizer, and an excessive number of forked rows will cause reverse direction flow and large pressure loss. This paper provids some guidance on the application of star-type flow straightener within fire cannons.
