Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control
Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control
复制标题
具有循环变桨控制的转子动态失速的数值研究
DOI：
--
复制
发表时间：
2019
影响因子：
1.5
通讯作者：
E. Krämer
中科院分区：
文献类型：
--
作者：
Johannes Letzgus;A. Gardner;Till Schwermer;M. Keßler;E. Krämer
双叶片马赫尺度旋翼三维动态失速数值研究(R = 0.65m，
Numerical investigations of three-dimensional dynamic stall on a two-bladed Mach-scaled rotor (R = 0.65m,
Ma75 = 0.21, Re75 = 3.5 × 105) with 1/rev cyclic pitch control are presented and compared to experimental
surface pressure and PIV data. In addition to URANS simulations using the finite-volume flow solvers FLOWer
and TAU, a delayed detached-eddy simulation (DDES) with Menter SST as underlying RANS model is carried out
with FLOWer. Facing dynamic stall and flow separation, the DDES reproduces high-frequency load fluctuations,
cycle-to-cycle variations and small-scale vortical structures as seen in the experiment, which is not the case with
URANS. However, common hybrid RANS-LES issues – grid-induced separation and the grey area problem –
play a role in this DDES and influence loads severely. FLOWer SST simulations yield load peaks of the same
magnitude as individual, non-phase-averaged measurements. With TAU SST the dynamic stall event is delayed
and weakened compared to FLOWer SST and experimental results. FLOWer and TAU results using the SA
turbulence model are fairly comparable but in bad agreement with the experiment at the outboard station at r/R =
0.77, where they exhibit no dynamic stall at all.