This study investigated the influence of casing profiles on the aeroelastic stability of a transonic compressor rotor.To elucidate the influence of casing profiles on aerodynamic damping(AD)and delve into more detaile...This study investigated the influence of casing profiles on the aeroelastic stability of a transonic compressor rotor.To elucidate the influence of casing profiles on aerodynamic damping(AD)and delve into more detailed insights,the influence coefficient method and phase-shift theory were incorporated into the conventional energy method to establish the multi-passage energy method.The unsteady pressure was calculated using the influence coef-ficient method and the outcomes at various nodal diameters(NDs)were reconstructed based on the phase-shift theory.Thus,the multi-passage energy method offers more comprehensive information than the conventional energy method,the aeroelastic eigenvalue method,and the coupled fluid-structure interaction method.Four casing profiles were simulated.In contrast to the straight casing configuration,the concave shrinking casing was found to be detrimental to aeroelastic stability.The convex shrinking casing can alleviate the blockage in the tip flow field and improve both the aerodynamic performance and aeroelastic stability.The multi-passage energy method further revealed that the AD is contributed by the blade itself and the adjacent blades.In comparison to the straight casing,the convex shrinking casing not only enhances the AD of the blade itself but also diminishes the AD fluctuation of the adjacent blades.Consequently,the minimum AD is increased.展开更多
Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of wo...Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of work has been done about bleeding,however,most of the work is studied with a single passage or ignoring the real structure of the bleeding system.In the present study,multi-passage calculation was used through ANSYS CFX to consider the finite duct holes in the whole blade row,and the effect of the axial location of bleeding slot on the non-uniformity of the blade passage was investigated,and the non-uniform could maintain a low level when bleeding at the front part of the blade passage and the non-uniformity would become large when moving the bleeding slot much further downstream.Afterward,the air bleeding mass flow rate was studied.It’s found that the non-uniformity of air bleeding mass flow is small when bleeding at a low mass flow rate in each passage and results in relatively uniform flow field in the passage.However,the non-uniformity increases significantly as the bleeding mass flow rate increases.Some flow field details were also given to study how the flow field changes when bleeding non-uniformly.展开更多
基金supported by the National Nature Science Foundation of China(Grant No.52306034).
文摘This study investigated the influence of casing profiles on the aeroelastic stability of a transonic compressor rotor.To elucidate the influence of casing profiles on aerodynamic damping(AD)and delve into more detailed insights,the influence coefficient method and phase-shift theory were incorporated into the conventional energy method to establish the multi-passage energy method.The unsteady pressure was calculated using the influence coef-ficient method and the outcomes at various nodal diameters(NDs)were reconstructed based on the phase-shift theory.Thus,the multi-passage energy method offers more comprehensive information than the conventional energy method,the aeroelastic eigenvalue method,and the coupled fluid-structure interaction method.Four casing profiles were simulated.In contrast to the straight casing configuration,the concave shrinking casing was found to be detrimental to aeroelastic stability.The convex shrinking casing can alleviate the blockage in the tip flow field and improve both the aerodynamic performance and aeroelastic stability.The multi-passage energy method further revealed that the AD is contributed by the blade itself and the adjacent blades.In comparison to the straight casing,the convex shrinking casing not only enhances the AD of the blade itself but also diminishes the AD fluctuation of the adjacent blades.Consequently,the minimum AD is increased.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51776048 and 51436002)
文摘Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of work has been done about bleeding,however,most of the work is studied with a single passage or ignoring the real structure of the bleeding system.In the present study,multi-passage calculation was used through ANSYS CFX to consider the finite duct holes in the whole blade row,and the effect of the axial location of bleeding slot on the non-uniformity of the blade passage was investigated,and the non-uniform could maintain a low level when bleeding at the front part of the blade passage and the non-uniformity would become large when moving the bleeding slot much further downstream.Afterward,the air bleeding mass flow rate was studied.It’s found that the non-uniformity of air bleeding mass flow is small when bleeding at a low mass flow rate in each passage and results in relatively uniform flow field in the passage.However,the non-uniformity increases significantly as the bleeding mass flow rate increases.Some flow field details were also given to study how the flow field changes when bleeding non-uniformly.
