公开(公告)号：US4142121A

公开(公告)日：1979-02-27

申请号：US855108

申请日：1977-11-25

申请人： Frederick C. Carpenter

发明人： Frederick C. Carpenter

IPC分类号： H01T13/52

CPC分类号： H01T13/52

摘要： A surface-discharge igniter for a gas-turbine engine has a pellet of rod shape a part at least of the pellet surface being semiconductive so that when voltage is applied between electrodes connected at either end of the pellet it causes electrical discharge along its length. The pellet may, in one arrangement, be mounted to be a tight fit within the central-section of a key-hole bore which extends axially through a ceramic block within the igniter's outer metal shell. A strip of the pellet surface is exposed along the radially-divergent section or discharge cavity of the bore and discharge along the strip generates a plasma flame within the cavity that bursts forth through an aperture in the bottom electrode at the tip of the shell. In another arrangement the rod-pellet is mounted at the end of a mineral-insulated cable, coaxially within a cylindrical cavity. The pellet may alternatively be mounted to extend transversely of the igniter and to be exposed along its length at the operative tip of the igniter. Discharge may occur over the whole of the pellet surface, but the active semiconductive surface may be limited to a longitudinal or helical strip.

摘要翻译： 用于燃气涡轮发动机的表面放电点火器具有棒状颗粒，其至少一部分是颗粒表面是半导体的，使得当在连接在颗粒的任一端的电极之间施加电压时，其沿其长度引起放电。 在一种布置中，颗粒可以安装成紧密配合在键孔的中心部分内，该孔孔轴向延伸穿过点火器的外部金属壳体内的陶瓷块。 颗粒表面的条带沿着孔的径向扩散部分或排出腔暴露，并且沿着条带的排放产生腔内的等离子体火焰，其通过壳体末端处的底部电极中的孔突出。 在另一种布置中，棒状颗粒安装在矿物绝缘电缆的端部，同轴地安装在圆柱形腔内。 可替代地，颗粒可以安装成沿点火器的横向延伸并且沿其长度暴露在点火器的操作尖端处。 放电可以在整个颗粒表面上发生，但是活性半导体表面可以限于纵向或螺旋条。