Research on Aerodynamic Detection of Aero-engine Blade
0
Citation
0
Reference
20
Related Paper
Abstract:
The paper applies aerodynamic detection method to detect aero-engine nondestructively.In this paper,generating technology of elementary blade,optimization design of 3D blade,airflow parameter distribution criteria of blade surface,alignment between aero performance and blade geometry,numerical simulation method and method of blade research and analysis are tested.The paper validates the methods,improves the blade design and innovates the theory and practice of bla-de profile testing.Keywords:
Aero engine
Blade element theory
Cite
The quality of the blade edge is important for the performance of aero-engine, so that the measurement of the blade edge is highly regarded. Several kinds of special measurement methods are presented, which focus on the measurement about blade edge, and its application situation, test accuracy, test ability and limitations etc. are surveyed.
Aero engine
Cite
Citations (3)
For a given axial turbine blade, reverse design method is developed to improve blade efficiency, optimize blade profile, or repair parts etc. In this process, design parameters for designing axial turbine blade are induced. The induced design parameters are as follows; ellipse at leading edge, radios of trailing edge, axial chord, tangential chord, wedge angle at the inlet, and unguided turning angle. Suction and pressure surfaces of turbine blade are described by cubic polynomials. Two sample blades we chosen and their blade profiles are measured at the mean radius. Values of design parameters for sample blades are obtained by the reverse design method. Re-designed blade profiles using calculated design parameters are compared with the measured data, and they show good agreement. So, the developed design method could be applied to design general turbine blades. Various blade shapes are designed, and they show that designed blade profiles can be adjusted by controlling design parameters.
Chord (peer-to-peer)
Trailing edge
Ellipse
Wedge (geometry)
Cite
Citations (0)
This paper reports a numerical method for the design of a unrunning blade with the consideration of both nonlinear aerodynamic and centrifugal forces. Accurate prediction of blade manufacture shape in turbomachinery is crucial for performance, efficiency and aeroelastic stability. An iterative procedure starting from a given blade running shape is developed to predict the manufacture blade shape. The model is based on a three-dimensional (3D) unsteady nonlinear Navier-Stokes Computational Fluid Dynamics (CFD) solver and the mode superposition structural dynamic theory in conjunction with a finite element structural model for the rotor blade. The manufacture profile of the blade (“Cold” blade) is estimated from the running blade shape (“Hot” blade). ANSYS finite element code is used to compute the deflection of the cold blade due to centrifugal loads. A finite volume based 3D nonlinear CFD code, coupled with a mode superposition structural dynamic modal method, is employed to determine the blade deflection due to unsteady aerodynamic loading. The difference between the computed blade profile and the targeted hot blade shape is used to predict a new cold blade for the next iteration if the convergence criterion is not met. The method is applied to predict the manufacture blade shape of a large-scale propfan and a NASA rotor 67 fan. The predicted blade profile and the twist angle of the blade at various spans are presented. The results show that improvements of the manufacture blade profile can be made by including proper nonlinear aerodynamic effect on the blade deflection in the numerical model. The results also illustrate that aerodynamic nonlinear effects on structural deformation should be included for a better cold blade design.
Blade element theory
Aeroelasticity
Turbomachinery
Helicopter rotor
Flutter
Cite
Citations (6)
Based on the research of aero standard HB 5647-1998 The label,tolerance and surface roughness of blade model and the application practice of measuring compressor blades using CMM,a method to measure and evaluate compressor blades using high precision CMM is presented.
Aero engine
Cite
Citations (0)
Both rotor aerodynamic characteristics and structural performance of the blade are critical to the wind turbine system service life; an accurate loading model of the blade is extraordinary complex due to the complexity of the geometry shape and variety of blade thickness. In this paper, a 10KW fixed-pitch variable-speed wind turbine blade with five different thickness of aerofoil shape along the span of the blade is presented as a case study, main parameters of the wind turbine rotor and the blade aerodynamic geometry shape are determined based on the principles of the blade element momentum (BEM) theory, a specific blade internal structure and layup schedule are designed. Based on the FE method, deflections and strain distributions of the designed blade under extreme wind conditions are numerically predicted. Theoretical and numerical results indicate that aerodynamic characteristics of the designed blade meet the requirement, the tip clearance is sufficient to prevent collision with the tower, and the blade material is linear and safe.
Blade element theory
Helicopter rotor
Cite
Citations (0)
Turbine blade is one of the key components of the aero engine. It needs to be inspected comprehensively and carefully during its production stage. The methods for investment turbine blade geometrical shape analysis based on optical scanning measurement were presented, including optical measurement data collection, blade model reliable alignment and geometrical shape deviation fast calculation and visualization. Real measurement data from a structure light measurement device for a turbine blade was used to validate the discussed methods.
Investment casting
Cite
Citations (2)
With 3MW composite blade wind turbine blade as an example, according to the momentum blade element theory, optimized the design of aerodynamic shape, established the Three-dimensional model of blade through coordinate conversion, and made the stress check of structure and modal analysis using the finite element method, and more detailed description of the design methods and techniques of large composite wind turbine blades
Blade element theory
Cite
Citations (1)
Aero engine
Natural frequency
Cite
Citations (2)
A novel iterative method is presented for turbomachinery blade un-running design with a fluid-structure coupled method.The effect of aerodynamic and centrifugal loads on blade deflections is considered in the process.Starting with a blade definition designed by an aerodynamic method,the procedure predicts a manufacturing blade profile,and computes blade deflections due to aerodynamic and centrifugal loads.The manufacturing blade profile is corrected accounting for the difference between the target blade shape and the newly deformed shape.The calculation of blade deflection due to aerodynamic loads simulates the interaction of fluid/structure at each time step,thus it is capable of accounting for the nonlinear aerodynamic contributions due to the blade deforming.In the aerodynamic domain,time accurate unsteady Reynolds averaged Navier-Stokes equation is solved in order to simulate the effect of blade deflections on the flow fields.The blade deflection is computed by solving structure dynamic equations with aerodynamic forces as boundary conditions.The information exchanges at each time step by an innovative projection-interpolation procedure with shape functions in order to transfer information between non-matching surface grids in the aerodynamic and structure domains.The method is used to predict the manufactured blade profile of NASA rotor 67 transonic fans,the predicted blade profile and the twist angle of the blade at various spans is presented.The results show that the proposed method for blade un-running design predicted more accurate manufactured fan blade shapes.
Blade element theory
Aerodynamic force
Turbomachinery
Aeroelasticity
Cite
Citations (0)
This paper introduces the FEA method for a certain type of aero-engine turbine blade and makes a vibration characteristics analysis to this aero-engine turbine blade based on this method. The vibration characteristic of this aero-engine turbine blade is studied and the natural modal of the turbine blade is calculated based on UG software. The first six natural frequencies and mode shapes are given. According to the analysis results the dynamic characteristics of the blade are discussed. The analysis method and results in this paper can be used for further study on optimal design and vibration safety verification for the blade.
Aero engine
Natural frequency
Cite
Citations (0)