Dynamics of Heat Fluxes in a Channel Area Heated by a Pulsed High-Current Discharge

IF 1 4区 物理与天体物理 Q4 PHYSICS, APPLIED
I. A. Znamenskaya, E. Yu. Koroteeva, E. A. Karnozova, T. A. Kuli-Zade
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引用次数: 0

Abstract

The dynamics of thermal fields of dielectric surfaces heated as a result of initiation of a pulsed high-current surface discharge (plasma sheet) was studied. A pulsed surface discharge sliding along the surface of a dielectric was generated on the upper (flat) and lower (with a ledge) walls of the discharge chamber with quartz windows. Sequential images of optical (nanosecond range) and infrared (millisecond range) radiation were obtained near a dielectric ledge in the shape of a rectangular parallelepiped with a size of 6 × 2 × 48 mm3. The time evolution of thermal radiation from surfaces was recorded with time-lapse photography in the infrared range at pressures from 65 to 290 Torr. It is shown that the cooling time of a plasma-heated region localized near the dielectric ledge can last up to 30 ms and significantly exceeds the cooling time of a flat upper wall heated by a discharge fairly uniformly distributed over the surface of the dielectric.

Abstract Image

脉冲大电流放电加热通道区域热通量的动态变化
摘要 研究了因启动脉冲大电流表面放电(等离子体片)而加热电介质表面的热场动力学。在带石英窗的放电室的上壁(平面)和下壁(带凸起)上产生了沿介质表面滑动的脉冲表面放电。在尺寸为 6 × 2 × 48 mm3 的矩形平行四边形电介质壁架附近获得了光学(纳秒级)和红外(毫秒级)辐射的序列图像。在 65 至 290 托的压力下,通过红外延时摄影记录了表面热辐射的时间演变。结果表明,介质边缘附近局部等离子体加热区域的冷却时间可长达 30 毫秒,大大超过介质表面上均匀分布的放电加热平面上壁的冷却时间。
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来源期刊
High Temperature
High Temperature 物理-物理:应用
CiteScore
1.50
自引率
40.00%
发文量
0
审稿时长
4-8 weeks
期刊介绍: High Temperature is an international peer reviewed journal that publishes original papers and reviews written by theoretical and experimental researchers. The journal deals with properties and processes in low-temperature plasma; thermophysical properties of substances including pure materials, mixtures and alloys; the properties in the vicinity of the critical point, equations of state; phase equilibrium; heat and mass transfer phenomena, in particular, by forced and free convections; processes of boiling and condensation, radiation, and complex heat transfer; experimental methods and apparatuses; high-temperature facilities for power engineering applications, etc. The journal reflects the current trends in thermophysical research. It presents the results of present-day experimental and theoretical studies in the processes of complex heat transfer, thermal, gas dynamic processes, and processes of heat and mass transfer, as well as the latest advances in the theoretical description of the properties of high-temperature media.
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