Instability Problem of Turbo-Machines with Radial Distortion Problems
In the upstream we place a piece of ring and rotate
it with 83Hz, 166Hz, 333Hz,and 666H to find the effect of the
periodic distortion.In the experiment this type of the perturbation
will not allow since the mechanical failure of any parts of the
equipment in the upstream will destroy the blade system. This type of
study will be only possible by CFD. We use two pumps NS32
(ENSAM) and three blades pump (Tamagawa Univ). The benchmark
computations were performed without perturbation parts, and confirm
the computational results well agreement in head-flow rate. We
obtained the pressure fluctuation growth rate that is representing the
global instability of the turbo-system. The fluctuating torque
components were 0.01Nm(5000rpm), 0.1Nm(10000rmp),
0.04Nm(20000rmp), 0.15Nm( 40000rmp) respectively. Only for
10000rpm(166Hz) the output toque was random, and it implies that it
creates unsteady flow by separations on the blades, and will reduce the
pressure loss significantly
[1] CAMPOS-AMEZCUA R., KHELLADI S., BAKIR F., CZERWIEC
Z.M., SARRAF C., REY R., "Numerical Analysis of Unsteady Cavitating
Flow in an Axial Inducer", Part A: J. Power and Energy, 2010, 224 (2),
223-238. [2]KHELLADI S., KOUIDRI S., BAKIR F., REY R.
[2] "Flow Study in the Impeller-Diffuser Interface of a Vaned Centrifugal
Fan", ASME Journal of Fluids Engineering, 127 , pp. 495, 502 - 2005
[3] Obikane Y., Kaneko M., Kakioka M, Ogura K."Image Analysis of Fine
Structures of Supercavitation in the Symmetric Wake of a Cylinder",
WASET, proceedings, Paris, June 24, 2011
[1] CAMPOS-AMEZCUA R., KHELLADI S., BAKIR F., CZERWIEC
Z.M., SARRAF C., REY R., "Numerical Analysis of Unsteady Cavitating
Flow in an Axial Inducer", Part A: J. Power and Energy, 2010, 224 (2),
223-238. [2]KHELLADI S., KOUIDRI S., BAKIR F., REY R.
[2] "Flow Study in the Impeller-Diffuser Interface of a Vaned Centrifugal
Fan", ASME Journal of Fluids Engineering, 127 , pp. 495, 502 - 2005
[3] Obikane Y., Kaneko M., Kakioka M, Ogura K."Image Analysis of Fine
Structures of Supercavitation in the Symmetric Wake of a Cylinder",
WASET, proceedings, Paris, June 24, 2011
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:61202", author = "Yasuo Obikane and Sofiane Khelladi", title = "Instability Problem of Turbo-Machines with Radial Distortion Problems", abstract = "In the upstream we place a piece of ring and rotate
it with 83Hz, 166Hz, 333Hz,and 666H to find the effect of the
periodic distortion.In the experiment this type of the perturbation
will not allow since the mechanical failure of any parts of the
equipment in the upstream will destroy the blade system. This type of
study will be only possible by CFD. We use two pumps NS32
(ENSAM) and three blades pump (Tamagawa Univ). The benchmark
computations were performed without perturbation parts, and confirm
the computational results well agreement in head-flow rate. We
obtained the pressure fluctuation growth rate that is representing the
global instability of the turbo-system. The fluctuating torque
components were 0.01Nm(5000rpm), 0.1Nm(10000rmp),
0.04Nm(20000rmp), 0.15Nm( 40000rmp) respectively. Only for
10000rpm(166Hz) the output toque was random, and it implies that it
creates unsteady flow by separations on the blades, and will reduce the
pressure loss significantly", keywords = "inlet distorsion, perturbation, turbo-machine", volume = "5", number = "5", pages = "930-3", }