CAJ | 학술논문

应用FLUENT对四喷嘴射流曝气器在不同工况下的引射空气性能进行三维数值模拟,分析了射流器内的场分布特性与气液两相流动结构;同时建立射流器性能实验台,对四喷嘴射流曝气器的性能进行实验研究.研究表明,四喷嘴射流器性能较高,能量损失较少,两相流动结构稳定;相对于单喷嘴射流器,四喷嘴射流器的流量比和效率随压力比的变化显著;四喷嘴射流曝气器在工况4下工作性能最好,其流量比q为3. 20,效率η为36%,而相似工况下单喷嘴结构流量比q仅为1左右,效率η不超过20%;数值模拟结果与实验结果吻合较好.
응용FLUENT대사분취사류폭기기재불동공황하적인사공기성능진행삼유수치모의,분석료사류기내적장분포특성여기액량상류동결구;동시건립사류기성능실험태,대사분취사류폭기기적성능진행실험연구.연구표명,사분취사류기성능교고,능량손실교소,량상류동결구은정;상대우단분취사류기,사분취사류기적류량비화효솔수압력비적변화현저;사분취사류폭기기재공황4하공작성능최호,기류량비q위3. 20,효솔η위36%,이상사공황하단분취결구류량비q부위1좌우,효솔η불초과20%;수치모의결과여실험결과문합교호.
A three dimensional numerical investigation was conducted to simulate the air entrainment performance of quad-nozzle jet aerator by using FLUENT. The characteristics of flow field distribution and the flow pattern of gas-liquid two-phase flow inside the aerator in various working conditions were analyzed. In the meantime, an experimental investigation on the performance of quad-nozzle jet aerator was carried out. The results show that the quad-nozzle jet aerator has higher air entrainment performance, lower energy loss and stable gasliquid two-phase flow pattern. Compared with the single-nozzle jet aerator, the variations of the entrainment ratio and efficiency with pressure ratio for quad-nozzle jet aerator are remarkable. The quad-nozzle jet aerator performs best under No. 4 working condition, under which the entrainment ratio q and the entrainment efficiency η equal 3.20 and 36%, respectively. By contrast, the entrainment ratio q of single-nozzle jet aerator approximately equals 1 and the entrainment efficiency η is lower than 20%. Good agreement between the numerical simulation results and the experimental data is found.