TA Computational Investigation of Flow Structure Within a Sinuous Duct

摘要

In the present investigation the distribution of mean velocity are experimentally studied on three constant area rectangular curved ducts with an aspect ratio of 2.4. First one is C-shape, second one is S-shape and third one is a DS-shape duct. The experiment is carried out at mass averaged mean velocity of 40m/s for all the ducts. The velocity distribution shows for C-duct, the bulk flow shifting from outer wall to the inner wall along the flow passage and for S-duct, the bulk flow shifting from outer wall to the inner wall in the first half and from inner wall to the outer wall in the second half along the flow passage of curved ducts are very instinct. Due to the imbalance of centrifugal force and radial pressure gradient, secondary motions in the forms of counter rotating vortices have been generated within both the curved duct. For DS-duct the velocity distributions shows the Bulk of flow shifting from inner watt to outer wall in the first bend and third bend of the duct and outer wall to inner wall in the second bend and forth bend of the duct along the flow passage is very instinct. Flow at end of the DS-duct is purely uniform in nature due to non existence of secondary motion. The experimental results then were numerically validated with the help of Fluent, which shows a good agreement between the experimental and predicted results for all the ducts