Analysis and research on structural robustness of bolted connections between discs of high-speed power turbines
In order to solve the robustness problem of bolt-connected structures between power turbines in an actual working load environment,a robustness evaluation method for bolt-connected structures was proposed.The contact characteristics of the interface under external loads were evaluated based on the aspects of effective contact area proportion and contact stress.Using the bolt-connected structure between the multi-stage discs of a certain high-power turboshaft engine's power turbine rotor as an example,the proposed connection structure robustness evaluation method was applied.It was found that the effective contact area of the interface was less than 20%,the maximum contact stress was more than 500 MPa under the working load environment,and the robustness was poor.On this basis,an in-depth analysis was carried out on the influence of three typical geometric configurations on the radial deformation,angular deformation,contact surface state and damage of the connection interface,and the variation rules of the mechanical characteristics of the inter-disc bolt-connected structures with different configurations along with the rotational speeds were summarized.It was condensed that the inter-disc bolt-connected structure has more advantages in its connection robustness at high rotational speeds.Based on the proposed robustness design method,the optimal design and robustness evaluation of the bolt-connected structure between the power turbine rotors of a high-power turboshaft engine was carried out.The results show that the effective contact area of the interface is more than 65%,and the maximum contact stress of 265 MPa is only half of the original.This verifies that the robustness design method has a significant effect in improving the contact surface condition coefficient and reducing the contact stress.
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