Abstract
Forced response analysis of a rocket engine turbine blade was conducted by a decoupled fluid-structure interaction procedure. Aerodynamic forces on the rotor blade were obtained using 3D unsteady flow simulations. The resulting aerodynamic forces were interpolated to the finite element (FE) model through surface effect elements prior to conducting forced response calculations. Effects of axial gap on aerodynamic forces were studied. In addition, influence of axial gap on the response of the shrouded blade was compared with that on the response of the unshrouded blade. Results demonstrated that as the axial gap increases, time-averaged pressure on the blade surface changes very little, while the pressure fluctuations decrease significantly. Pressure and aerodynamic forces on the blade surface display periodic variation, and the vane passing frequency component is dominant. Amplitudes of aerodynamic forces decrease with increasing axial gap. Restricted by the shroud, deformation and response of shrouded blade are much lower than those of the unshrouded blade. The response of unshrouded blade shows obvious beat vibration phenomenon, while the response of the shrouded blade does not have this characteristic because the shroud restrains multiple harmonics. Blade response in time domain was converted to frequency domain using fast Fourier transformation (FFT). Results revealed that the axial gap mainly affects the forced harmonic at the vane passing frequency, while the other two harmonics at natural frequency are hardly affected. Amplitudes of the unshrouded blade response decrease as the axial gap increases, while amplitudes of the shrouded blade response change very little in comparison.
Similar content being viewed by others
References
Zhao B, Yang C, Chen S, et al. Unsteady flow variability driven by rotor-stator interaction at rotor exit. Chinese J Aeronaut, 2012, 25: 871–878
Moffatt S, Ning W, Li Y, et al. Blade forced response prediction for industrial gas turbines. J Propul Power, 2005, 21: 707–714
Kulisa P, Dano C. Numerical simulation of unsteady blade row interactions induced by passing wakes. Eur J Mech-B/Fluids, 2006, 25: 379–392
Chaluvadi V S P, Kalfas A I, Banieghbal M R, et al. Blade-row interaction in a high-pressure turbine. J Propul Power, 2001, 17: 892–901
Rose M G, Harvey N W. Turbomachinery wakes: Differential work and mixing losses. J Turbomach, 2000, 122: 68–77
Rose M, Schüpbach P, Mansour M. The thermodynamics of wake blade interaction in axial flow turbines: Combined experimental and computational study. J Turbomach, 2013, 135: 031015
Korakianitis T. Influence of stator-rotor gap on axial-turbine unsteady forcing functions. AIAA J, 1993, 31: 1256–1264
Venable B L, Delaney R A, Busby J A, et al. Influence of vane-blade spacing on transonic turbine stage aerodynamics: Part I—Time-averaged data and analysis. J Turbomach, 1999, 121: 663–672
Busby J A, Davis R L, Dorney D J, et al. Influence of vane-blade spacing on transonic turbine stage aerodynamics: Part II—Time-resolved data and analysis. J Turbomach, 1999, 121: 673–682
Chang D, Tavoularis S. Effect of the axial spacing between vanes and blades on a transonic gas turbine performance and blade loading. Int J Turbo Jet Eng, 2013, 30: 15–31
Park J Y, Choi M S, Baek J H. Effects of axial gap on unsteady secondary flow in one-stage axial turbine. Int J Turbo Jet Engines, 2003, 20: 315–334
Gaetani P, Persico G, Osnaghi C. Effects of axial gap on the vane-rotor interaction in a low aspect ratio turbine stage. J Propul Power, 2010, 26: 325–334
Kikuchi M, Funazaki K, Yamada K, et al. Detailed studies on aerodynamic performances and unsteady flow behaviors of a single turbine stage with variable rotor-stator axial gap. Int J Gas Turb, Propul Power Syst, 2008, 2: 30–37
Restemeier M, Jeschke P, Guendogdu Y, et al. Numerical and experimental analysis of the effect of variable blade row spacing in a subsonic axial turbine. J Turbomach, 2013, 135: 021031
Cizmas P G A, Hoenninger C R, Chen S, et al. Influence of inter-row gap value on turbine losses. Int J Rotating Mach, 2001, 7: 335–349
Tang E, Leroy G, Philit M E, et al. Unsteady analysis of inter-rows stator-rotor spacing effects on a transonic, low-aspect ratio turbine. In: Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Montreal, Canada, 2015
Li D Y, Gong R Z, Wang H J, et al. Dynamic analysis on pressure fluctuation in vaneless region of a pump turbine. Sci China Tech Sci, 2015, 58: 813–824
Guo L, Liu J T, Wang L Q, et al. Pressure fluctuation propagation of a pump turbine at pump mode under low head condition. Sci China Tech Sci, 2014, 57: 811–818
Misek T, Tetiva A, Prchlik L, et al. Prediction of high cycle fatigue life of steam turbine blading based on unsteady CFD and FEM forced response calculation. In: Proceedings of GT2007 ASME Turbo Expo 2007: Power for Land, Sea and Air. Montreal, Canada, 2007
Suder K L. Experimental investigation of the flow field in a transonic, axial flow compressor with respect to the development of blockage and loss. Dissertation of Doctoral Degree. Cleveland, Ohio: Department of Mechanical and Aerospace Engineering, Case Western Reserve University. 1996
Ameri A A. NASA rotor 37 CFD code validation. In: 47th Aerospace Sciences Meeting. Orlando, Florida, 2009
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Jiang, J., Li, J., Cai, G. et al. Effects of axial gap on aerodynamic force and response of shrouded and unshrouded blade. Sci. China Technol. Sci. 60, 491–500 (2017). https://doi.org/10.1007/s11431-016-9010-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-016-9010-y