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HL-2A装置边缘等离子体测地声模带状流的三维特征采用外中平面上三组三台阶探针阵列组成具有环向、极向和径向分辨的独特结构的探针系统进行了研究.其中两组具有极向距离为65mm的三台阶5探针阵列组成极向带状流10探针组,另一组电动式带状流6探针阵列与带状流10探针组之间的环向距离为800mm.此外,采用快速往复气动6探针组研究了磁分界面附近的温度、密度、雷诺协强及其径向分布.在HL-2A装置上同时观测到测地声模带状流(频率f=7kHz)的极向和环向对称性(m≈0,n≈0),且径向特征尺度为2·4—4·2cm.双谱分析的结果表明测地声模带状流的形成机理可能是由于高频湍流和这种流之间的非线性三波耦合引起的.雷诺协强的径向梯度可以驱动带状流,相反带状流也可以抑制边缘湍流.
Three-dimensional characteristics of geophone strip flow in edge-plasma geophone of HL-2A device The probe system with three groups of three-step probe array in the outer midplane was used to form the unique structure with circular, polar and radial resolution. Two sets of three step 5 probe arrays with a pole pitch of 65 mm make up a polar ribbon flow 10 probe set and the other set of electrified strip flow 6 probe arrays and ribbon flow 10 probe sets And the distance between them is 800mm. In addition, the temperature, density, Reynolds number and its radial distribution in the vicinity of the magnetic interface were studied by using the rapid reciprocating 6-probe set.At the same time, the geophone band (M ≈ 0, n ≈ 0), and the radial feature scale is 2.4-4.2 cm.The results of bispectrum analysis show that the geophone The formation mechanism of ribbon flow may be due to the nonlinear three-wave coupling between the high-frequency turbulence and this flow. The Reynolds-enhanced radial gradient can drive the ribbon flow, and the opposite ribbon flow can also restrain the edge turbulence.