论文部分内容阅读
IGCC系统中新一代先进燃气轮机透平通流部分处于高温高湿的工作环境,因此其内部流动存在固有的复杂的流热耦合问题。为指导燃气轮机透平叶片冷却系统设计必须开展对流热耦合问题的试验与数值研究。本文在一平板气膜冷却流热耦合实验台上开展了模拟新一代燃气轮机透平通流部分高温高湿工作条件的流热耦合机理研究,并进行了数值模拟。研究工作表明:高温高湿条件下,辐射换热对总体换热特性影响十分显著,因此在通过试验和数值手段研究流动、对流换热和辐射换热多场耦合问题时必须合理考虑辐射换热的影响;本文还给出了通过数值手段模拟辐射换热问题的简化边界建模方法,并提出了中心线总体冷却效率和主流水蒸气摩尔分数及流向距离之间的拟合关系式。
IGCC system, a new generation of advanced gas turbine turbine through the flow part of the high temperature and humidity in the working environment, so its internal flow inherent inherent complex flow and heat coupling problems. In order to guide the design of gas turbine turbine blade cooling system, the convection and thermal coupling problems must be studied experimentally and numerically. In this paper, a thermo-mechanical coupled experimental platform of flat film cooling and fluid flow was used to simulate the flow-heat coupling mechanism for simulating the high-temperature and high-humidity operating conditions of the turbine of a new generation of turbine. Numerical simulations were carried out. The research work shows that under the conditions of high temperature and high humidity, the radiative heat transfer has a significant effect on the overall heat transfer characteristics. Therefore, we must consider the radiation heat transfer reasonably when studying the multi-field coupling problems of flow, convection heat transfer and radiation heat transfer through experiments and numerical means This paper also gives a simplified boundary modeling method to simulate the radiation heat transfer problem by numerical means and presents the fitting relationship between the overall cooling efficiency of the centerline and the mainstream water vapor mole fraction and the flow direction distance.