【作者】 李振宇；

【导师】 郑洪涛；

【作者基本信息】 哈尔滨工程大学 ， 动力工程， 2003， 硕士

【摘要】 发动机等离子点火技术是等离子体工业应用的一次新尝试。目前，世界上几个技术发达国家都开展了等离子点火系统的研究，尤其是独联体国家更是率先把等离子点火系统用于舰用燃气轮机以及从西伯利亚到欧洲的远距离输油干线的燃气轮机泵站上，使发动机的点火可靠性和点火的浓度极限得到了极大的提高。 等离子发生器是等离子点火系统中的一个重要部件。空气流经等离子发生器时会发生传热、传质以及等离子化学反应等一系列复杂的物理化学过程。在等离子点火技术的研究过程中，等离子发生器以其过程机制复杂、尺寸空间小实验测量困难的特点成为等离子点火技术研究的重点。 本文针对GT25000等离子点火系统中的等离子发生器模型展开了研究。从热特性、电特性、焰流速度和燃烧稳定性的角度分析了发生器中等离子弧的特征。应用数值计算的方法模拟了等离子发生器内部的纯空气流动，应用零维理论分析模型和连续介质假设建立了描述等离子发生器内部流动和传热的数学模型；采用贴体坐标系对等离子发生器的流场空间进行空间离散；采用SIMPLEC算法来求解离散方程，获得流场的数值解。 本文在对等离子发生器内部纯空气流场的模拟过程中，分析了不同进口气流角、不同进口总压以及不同气流压缩角对发生器电极壁面温度的影响。有关分析结果可以定性的反映电极壁面的热负荷情况，对于冷却发生器电极、延长发生器使用寿命有重要的指导意义。更多还原

【Abstract】 Plasma ignition technique for engine is a new pattern technique, at the present some developed countries have studied Plasma ignition system. Ukraine have firstly used this technique in marine gas turbine and pumping station of the gas turbine used for the long distance oil transportation main from Siberia to Europe which increases the reliability of retrofires and extend the concentration limit of retrofires.Plasma generator is a very important component in the plasma ignition system. The air flow across the plasma generator will result in heat transfer, mass transfer, plasma chemical reactions and other mechanisms of processes. In the process of study plasma ignition technique, the study of plasma generator is the most important work for its complex mechanisms of processes and too small space to observe by experiment.This article builds the numerical plasma generator model of GT25000 plasma ignition system. It analyses the plasma electrical arc characteristic from the thermal and electrical characteristic and flame flow rate and the burning stability. Using the numerical computation method to simulate the pure air flowing in the plasma generator and using zero dimension theory and continuous medium hypothesis to establish the mathematical model of the plasma generator and applying the curvilinear coordinate to disperse the space of the plasma generator, applying SIMPLEC method to solve the set of discredited equations.The article analyses the influence to the generator electrode temperature from different inlet angle and inlet total pressure and the compressive angle of fluid in the situational process. The analytical result will reflect the electrode wall heat load qualitatively. It will play the great role on the life of the generator electrode.更多还原