Thermal design and analysis of an exhaust diffuser unit in a ceramic composite
Abstract
The exhaust diffuser unit of a modern air breathing engine has been chosen for a design study using ceramic composites. This is part of a wider research program to introduce new materials into aero-engines. Although the unit is relatively lightly stressed, it is subject to a severe thermal environment, and poses a significant test of the behavior of new materials. Material selection has been based on deformation maps, using merit parameters for strength and toughness under thermal shock. Heat transfer analysis of the conceptual design has established the thermal transients, and allowed the estimation of thermally induced stresses. The stress levels are sufficient to induce micro-cracking in ceramic composites, and has required the development of appropriate damage mechanics models.
- Publication:
-
11th International Symposium on Air Breathing Engines
- Pub Date:
- 1993
- Bibcode:
- 1993abe..conf..637M
- Keywords:
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- Air Breathing Engines;
- Ceramic Matrix Composites;
- Engine Design;
- Exhaust Diffusers;
- High Temperature Environments;
- Tensile Strength;
- Aerodynamic Heat Transfer;
- Aircraft Engines;
- Microcracks;
- Structural Mechanics