Faithin Omaha eBook Collection

Download or read book A Visualization Study of Secondary Flows in Cascades written by Arthur G. Hansen and published by . This book was released on 1953 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow-visualization techniques are employed to ascertain the streamline patterns of the nonpotential, secondary flows in the boundary layers of cascades, thereby providing a basis for more extended analyses in turbomachines. The three-dimensional deflection of the end-wall boundary layer results in the formation of a vortex well up in each cascade passage. The size and tightness of the vortex generated depend upon the main flow turning in the cascade passage. Once formed, a vortex resists turning in subsequent blade rows. This results in unfavorable angles of attack and possible flow disturbances on the pressure surfaces of subsequent blade rows when the vortices impinge on these surfaces.