科研之友
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摘要
Analytic solutions for the unsteady flow in a circular sector duct are found using series sums of Bessel integrals For starting flow due to a step pressure gradient the velocity profile is initially flat then approaches the rounded steady state shape in a time scale proportional to the square of opening angle of the sector For oscillatory flow the velocity is quasi-steady for low frequencies but shows annular effect at large frequencies Increased opening angle inc
- 出版日期2011-1
