非均匀受热贫油直喷燃烧室动力学特性分析OA

This paper focuses on the lean direct injection combustion chamber and establishes a finite meta-model under different temperature loads.When the dynamic properties of the combustion chamber in various unevenly-distributed heating environments are simulated and calculated,it is spotted that certain order modal experiences modal shifting phenomena when combustion chamber is under different thermal conditions.As vibration tests were conducted on the combustion chamber under combustion conditions,the analysis results indicated that the non-uniform temperature distribution inside the combustion chamber led to structural configuration changes.The deformation that happened to a hyperbolic-like-shaped dome directly caused modal shifting in the combustion chamber.The dynamic property variation pattern of the lean direct injection combustion chamber under non-uniform temperature loads provides valuable insights for the structural and dynamic optimization design in engineering practice,contributing to the extension of its operational lifespan.