旋流冷壁燃烧室燃烧性能的数值分析

Combustion Performance Analysis on Swirl-cooled Wall Combustor

中文关键词: 燃烧效率  场协同  燃料掺混  换热性能

英文关键词: Combustion efficiency  Field synergy  Fuel mixing  Heat transfer performance

中文摘要:

      为进一步深化对中心空气射流及相关参数影响燃烧室性能变化规律的认识,采用雷诺应力模型(RSM)开展了有无中心空气射流、射流速度与射流孔径对燃烧效果影响的仿真研究。结果表明：增加空气中心射流以及改变相关参数能提高燃烧效率的主要原因在于湍流强度的增强改善了换热性能。壁面附近的协同角是影响旋流冷壁效果的重要因素,协同角越接近90°,越有利于获得较好的冷壁效果。

英文摘要:

      To further understand the principle of effects on combustion performance by central air jet and its associated parameters, Reynolds Stress Model (RSM) is utilized to carry out simulations of central air jet, jet velocity and jet hole diameter. The results showed that, in addition to resolved the defect of mixing of fuel and oxidizer near the axis, the main reasons of add air central jet and change the parameters improving the combustion efficiency was that enhanced turbulence intensity improved heat transfer performance. Synergy angle near the wall is an important factor of the cooling effect of the wall, the closer synergy angle to 90°, the more advantageous for obtaining good cooling effect of the wall.