某燃气轮机舷侧进气流场数值仿真

Numerical simulation of side intake flow of a gas turbine

    摘要
  • 摘要:
      目的  研究风向变化对燃气轮机舷侧进气流场稳定性、均匀性、流动阻力损失的影响，通过仿真研究验证该形式是否满足燃气轮机的进气要求。
      方法  采用CFX对燃气轮机进气流场进行数值模拟，通过设定不同的进气角度，对比不同进气状态下其对进气系统内流线分布、前进气百叶窗、侧进气百叶窗及进气系统出口的总压分布、前进气滤清器和侧进气滤清器截面的速度分布，研究不同进气方向下燃气轮机进气的均匀情况。
      结果  仿真结果表明，进气角度的不同会导致前进气和侧进气的掺混剧烈程度不同，而在配置了该进气系统之后，前、侧进气角度不同引起的不均匀性在流经进气稳压室后会得到较大改善，从而使得下游流动更加均匀。
      结论  研究结果对燃气轮机舷侧进气系统的设计具有一定的指导意义。

     

    Abstract:
      Objectives   This paper studies the influence of wind direction on the stability, evenness and loss of flow resistance of the side intake flow of a gas turbine.
      Methods   CFX is applied to make numerical simulation of the intake flow of the gas turbine. Through setting of the intake angle and comparison of the flow line distribution of the intake system under different intake status, the total pressure distribution of the fore intake louver, the side intake louver and the outlet of the intake system, and the cross-sectional velocity distribution of the fore and side intake filters, the intake evenness of the gas turbine with intake flow in different directions is studied.
      Results   It is shown that, the mixing intensity of fore and side intake air varies with the intake angle. Thanks to the intake system, the unevenness of air flow due to difference between fore and side intake angles is greatly improved after the air flows through the intake pressure stabilizing chamber, making the downstream airflow more even.
      Conclusions   The findings are meaningful for guiding the design of the side intake system of the gas turbine.

     

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