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Research on the Containment of Several Kinds of Typical Casing Structures

Author: ChenGuangTao
Tutor: XuanHaiJun
School: Zhejiang University
Course: Chemical Process Equipment
Keywords: aero-engine containment simulation methodology disk burst Johnson-Cook model multilayer casing
CLC: V231
Type: Master's thesis
Year: 2014
Downloads: 20
Quote: 0
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Abstract


The containment process involves high-energy, high-speed interactions of numerous locally and remotely located engine components. It includes every nonlinear aspect of structural dynamics, such as large displacements, plastic behavior of the materials, and contact interaction between structural elements. It is of great importance to study the containment of failed rotor for the improvement in both safety and design of aero-engine. To this end, the main researches are as follows:(1) Johnson-Cook model, which is used in the simulation, has been studied. The influence of each model parameter on the simulation results has been analyzed and the measuring methods of each model parameter have been introduced.(2) Containment of stiffened casing for failed blades has been studied. Impact tests are performed while failed blades are reduced to blade-like projectiles, and a part of real stiffened casing is cut as targets. A simulation model is set up to study the performance characteristics of impact tests and the simulated results are in agreement with the test results. The dorminate failure modes are pointed out. The impact resistance ability of single rib stiffened plate and the flat plate with the same mass are compared. It seems that stiffened plates have a17%higher critical speed than flat plates and stiffened plates are13%lighter than flat plates with the same impact resistance ability. Destroy potential energy method equation is found to be more applicable than UEDDAM equation.(3) Containment of fan casing with U type structure subjected to the impact of disk fragments has been studied. A containment test is performed and result shows that the casing can resist the impact of three high energy disk fragments. The containment process is simulated using LS-DYNA and it seems that the pipe absorbs more impact energy than the protection ring. The combine protection of pipe and ring makes sure the result is contained. Another three sizes of rings are designed to study the influence of changing groove depth of ring. Results show that the size infects not only the rigidity of ring, but also the interaction mechanism between fragments and casings. The present size of ring is quite reasonable from the point of containment.(4) Containment of nozzle ring subjected to the impact of disk fragments has been studied. A containment test is performed and result shows that the casing can resist the impact of three disk fragments. The containment process can be seen by means of simulation. It is recommended that the installation structure should have enough strength to bear axial force generated by impact. Since disk fragments fly away from the bottom of nozzle ring with some kinetic energy, component to capture fragments is required. It is also recommended that TC4and2A12material can be used as the material of nozzle ring because they can ensure not only the containment but also a lighter mass.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine theory
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