A pilot discharge channel gas transient temperature orthogonal observation system and method

Abstract

The invention discloses an orthogonal observation system and method for gas transient temperature in a pilot discharge channel. The system includes a quantitative schlieren measurement optical path, a Moiré fringe measurement optical path, a discharge electrode, a conversion unit, an oscilloscope and a data storage unit; the quantitative schlieren optical path The first image acquisition unit CA1 and the second image acquisition unit CA2 in the Moiré light path work in master-slave mode, and CA1 outputs a synchronous exposure clock signal for input to CA2, which ensures that the two are at the same shooting speed and realizes the instantaneous gas flow in the pilot channel. The comparative measurement of the state temperature solves the problem that the gas temperature measurement results of the pilot discharge channel are difficult to verify. The invention realizes the three-dimensional reconstruction of the development path of the pilot discharge channel through the orthogonal arrangement of the two flow field display and measurement optical paths, ensures that the pilot channel satisfies the coaxial symmetry assumption required for gas temperature inversion, and realizes the gas temperature of the pilot discharge channel. Transient temperature time domain continuous comparison measurement, and the measurement system has the significant advantage of self-calibration capability.

Description

technical field [0001] The invention belongs to the technical field of high-voltage long-gap discharge plasma diagnosis, and more particularly relates to an orthogonal observation system and method for gas transient temperature in a pilot discharge channel. Background technique [0002] The positive polarity long air gap discharge mechanism is the theoretical basis for the insulation optimization design and lightning protection technology research of UHV power transmission and transformation systems. The positive polarity long air gap discharge in the laboratory mainly includes the main processes of streamer discharge initiation, leader initiation, leader continuous development and final breakdown, among which leader discharge is the dominant physical process leading to gap breakdown. [0003] The pilot discharge is a discharge phenomenon dominated by the thermal ionization process. Unlike the gas temperature in the streamer discharge channel, which is close to room temperat...

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Problems solved by technology

[0011] In view of the defects of the prior art, the purpose of the present invention is to provide a pilot discharge channel gas transient temperature orthogonal observation system and method, aiming to solve the problem of channel gas temperature measurement due to the large randomness of the pilot discharge and the non-repeatability of the discharge. Difficult to verify the accuracy of the problem

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