| 摘要 |
PURPOSE:To reduce separation region and energy loss due to the separation region by a structure wherein straightening vanes are located at the bend part of a blast duct so as to partition the bent flow passage into several passages in order to make the 'flow passage width-to-radius of curvature' ratio smaller. CONSTITUTION:In a blast duct 1, bent walls 3a and 3b are formed by concentric circles with center at a point P having the radii of curvature r1 for the bent inner wall 3a and r4 for the bent outer wall 3b in the neighborhood of an end opening 2. Under the state that a casing is fitted into the end opening 2 of the duct 1, a first straightening vane 9 located on the inner side of a bend part 3 and a second straightening vane 10 located on the outer side of the bend part 3 are integrally formed by concentric circles with center at a point P having the radii of curvature r2 for the first straightening vane 9 and r3 for the second straightening vane 10, resulting in dividing the bent part 3 into the first, second and third flow passages 11, 12 and 13 and accordingly making the 'flow passage width-to-radius of curvature' ratio smaller. Consequently, as for each divided flow passage, the value of the separation region, which is determined by the 'flow passage width-to-radius of curvature' ratio, becomes smaller, resulting in enabling to suppress the energy loss of fluid due to the separation region.
|
