连续弧等离子点火器结构优化研究  

Research on Optimization Design of Continuous Plasma Igniter

作　　者：宋少雷 李雅军 王玥 郑洪涛[3] SONG Shao-lei;LI Ya-jun;WANG Yue;ZHENG Hong-tao(No.3 Naval Representative Office at Harbin District,Harbin,China,Post Code:150078;No.703 Research Institute of CSIC,Harbin,China,Post Code:150078;College of Power and Energy Engineering,Harbin Engineering University,Harbin,China,Post Code:150001)

机构地区：[1]海装驻哈尔滨地区第三军事代表室,黑龙江哈尔滨150078 [2]中国船舶重工集团公司第七〇三研究所,黑龙江哈尔滨150078 [3]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2020年第10期43-50,共8页Journal of Engineering for Thermal Energy and Power

基　　金：船舶与海洋工程动力系统国家工程实验室—海洋工程燃气轮机实验室资助;国家科技重大专项(2017-Ⅲ-0006-0031/2017-Ⅲ-0007-0033);黑龙江省杰出青年科学基金(JC2018012)。

摘　　要：为解决燃气轮机在启动点火时,等离子点火器附近的高速横风将等离子电弧吹倒,无法点燃主燃料的问题,对等离子点火器的阳极结构进行改进设计:在等离子点火器阳极顶端迎风侧开设斜气孔,优化斜气孔的结构形式和布置方式,采用数值模拟的方法对等离子点火器各种结构下的流场进行分析,得到可控电弧刚性最好、有效点火长度最长的点火器结构。最优结构是在等离子点火器阳极顶端迎风侧开设两层斜气环,斜气环的宽度为2 mm、径向夹角为30°、圆周角为45°。计算结果表明:斜气孔会在等离子点火器前端形成诱导涡,该诱导涡能诱导等离子弧主动向上游偏转,迎击横向来流。为验证改造后的点火器性能,进行了大气环境试验。试验结果表明:采用斜气孔结构的点火器提高了等离子弧刚性,增长了有效等离子弧长度,提高了点火的可靠性。为进一步验证结构改进的有效性,将该型等离子点火器装载在某型燃气轮机上进行整机试车试验,点火延迟时间仅为1.6 s,极大地保证了点火的可靠性。In gas turbine ignition process,the high-speed crosswind around igniter will blow down plasma arc,and the fuel will not be ignited.To solve this problem,the author has modified plasma igniter anode structure and optimized its placement.The improved igniter structure has inclined orifices at its anode windward side.The flow field with different igniter structure has been analyzed by numerical simulation.Ultimately,the optimized igniter has the most rigid and longest plasma arc.The optimized structure of plasma igniter has two annular grooves at its anode windward side.The groove wide is 2 mm,with 30°radial angle and 45°sector angle is.The numerical results show that the inclined orifices can establish an induced vortex at upwind side of the igniter and the vortex can induce plasma arc to automatically turn upstream.Experiments under atmosphere condition have been carried out to validate the performance of the modified igniter,and the results show that the inclined orifices have improved plasma arc rigidity,prolonged the plasma arc length and enhanced its ignition reliability.In the trial operation where the optimized plasmatic igniter has been installed at one type of gas turbine,the ignition delay time is only 1.6 s,which improves the ignition reliability.

关 键 词：连续弧 等离子体 点火器 诱导涡 燃气轮机 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]