• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Mechanical Science and Technology >Numerical investigation on combustion instability modeling in a lean premixed gas turbine combustor combining finite element analysis with local flame transfer function
【24h】

Numerical investigation on combustion instability modeling in a lean premixed gas turbine combustor combining finite element analysis with local flame transfer function

机译：用局部火焰传递函数结合有限元分析的贫燃气燃烧器中燃烧不稳定建模的数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present work suggests a numerical approach using an FEM (finite element method) code for the eigenvalue calculation of the thermoacoustic combustion instabilities coupling with the local flame transfer function in a generic lean premixed combustor. The URANS (unsteady Reynolds average Navier-Stokes) simulation shows a good agreement in capturing steady and unsteady flame geometries with the measurement in the literature. Also, global and local parameters of flame responses to acoustic velocity fluctuations undergo quantitatively similar changes in prediction and in the experiment. The numerically determined flame transfer function and gas properties are incorporated in an in-house Helmholtz solver to compute eigenvalues of the target combustor. In the solver, the Helmholtz equation is discretized with a Galerkin FEM on a multi-dimensional hybrid unstructured mesh. The nonlinearity related with the heat release source term is treated with an iterative methodology, and the large scale eigenvalue calculation is performed using the shift-invert approach available in the ARPACK (ARnoldi PACKage) library. The predictive capabilities of the current modeling approach are validated against the measured mode frequency and instability growth rate. In addition, the prediction results show the effect of spatially-distributed heat release on the thermoacoustic model accuracy.
机译：本工作表明，使用FEM（有限元方法）代码的数值方法，用于在通用精益预混燃烧器中与局部火焰传递函数耦合的热声燃烧不稳定性的特征值计算。铀师（不稳定的雷诺斯普通Navier-Stokes）仿真在捕获稳定和不稳定的火焰几何形状中，在文献中捕获稳定和不稳定的火焰几何。此外，对声速波动的全局和局部参数对声速波动进行定量类似的预测变化和实验。数值确定的火焰转移函数和气体特性结合在内部Helmholtz求解器中以计算目标燃烧器的特征值。在求解器中，Helmholtz方程在多维混合非结构网格上与Galerkin Fem离散化。与热释放源术语相关的非线性用迭代方法处理，并且使用Arpack（Arnoldi包）库中可用的移位反转方法进行大规模的特征值计算。目前建模方法的预测能力验证了测量的模式频率和不稳定的生长速率。此外，预测结果显示了空间分布的热释放对热声学模型精度的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号