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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:中国空间科学技术

Volume:37

Issue:5

Page Number:24-32

ISSN No.:1000-758X

Abstract:The discharge process and performance characterization of a planar ablation micro-pulsed plasma thruster (μ-PPT ) were investigated . Based on the electrical measurements of the discharge process and optical behavior of the plasma region , the basic discharge characteristics and the evolution of the discharge pattern of μ-PPT were studied . From the spatial pattern ,μ-PPT discharge gap can be divided into three regions ( cathode region , arc column region and anode region);with the discharge gap decreasing , the anode area gradually disappears . From the temporal behavior ,μ-PPT is composed of several pulse discharges with different amplitude . The number of discharge pulses is determined by the impedance detail of the discharge circuit and discharge gap . Single pulse discharge can occur under suitable conditions . Based on the current sheet model of the μ-PPT plasma region , the basic performance parameters such as impulse-bit and specific impulse of μ-PPT were estimated . The results show that the discharge gap and ablation volume have an important effect on theμ-PPT performance parameters . With same discharge energy pulse , the larger the gap is , the larger the impulse-bit is , leading to larger ablation amount and smaller specific impulse . Discharge time-space morphology is the key factor that affects the impulse-bit and specific impulse of μ-PPT . Therefore , it is an effective way to improve the μ-PPT performance by studying the optimization of discharge circuit and discharge gap impedance .

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