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Research on Dynamic Characteristic and Structural Optimization Design of Turbine Blade with Zigzag-shroud

Author: HeBang
Tutor: LuoGuiHuo
School: Nanjing University of Aeronautics and Astronautics
Course: Power Machinery and Engineering
Keywords: Jagged crown Turbine blades Vibration Structural optimization design Friction damping
CLC: V263.6
Type: Master's thesis
Year: 2007
Downloads: 279
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Abstract


The main purpose of this paper is to study the vibration characteristics of turbine blades with serrated crown , with a serrated crown turbine blade vibration characteristics analysis of the impact factors and the impact of the law , and to explore the jagged crown optimization design method to optimize the turbine blade serrated crown surface structure parameters . Provide a theoretical reference for the structural design of the turbine blade serrated crown . Jagged crown for the study of turbine blade vibration characteristics , the first cantilever spring and mass simplified model to simulate the turbine blade serrated crown , as the first natural frequency of the first five of the increase in the quality of the leaf canopy model will gradually decline through the analysis found , with the increase the natural frequency of the model with the spring support stiffness will gradually increase, and the increase in the amplitude of each order frequency is not the same . Followed by the establishment of a single blade , finite element analysis model of the two-blade and three-blade turbine blade serrated crown , modal analysis , steady - state excitation analysis and transient kinetic analysis , studies have shown that as the speed increases blade frequency will increase , but every order of increasing frequency is not the same as the magnitude of the response on the jagged crown leaves change as the jagged crown work surface contact stiffness change maximum response corresponding to the excitation frequency will offset , there a minimum value of the stiffness displacement response ; kinetic energy attenuation characteristics of different damping coefficients under the jagged crown . In this paper, based on the analysis of the calculation model of a single- blade and three-blade test model and modal testing and steady state vibration test from the test validation the jagged crown FM and damping effect . Pre-twist angle in the the jagged crown structure optimization design section analysis to extract the parameters of the main design features of the jagged crown , to establish the parameters of the turbine blade serrated crown model ; analysis of the two main type surface parameters that affect the the jagged crown work surface stress distribution deflection angle and the face , and these two parameters for the variable structure optimization model ; utilize VC UG / OPEN API functions and ANSYS APDL language parametric modeling and finite element analysis package together ; using a multidisciplinary optimization the integration platform iSIGHT complete jagged crown structure optimization . Significantly improved compared to before through the jagged crown optimized blade stress distribution and optimization .

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