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低功率电弧加热发动机的比冲较小,提高发动机效率对于低功率电弧加热发动机的成功应用十分重要。该文在原有电弧加热发动机基础上进行改进,设计了覆盖发动机阳极的环形空腔,形成再生冷却通道。实验中采用氩为推进剂,在典型工况下将发动机的比冲和效率与原电弧加热发动机进行对比。当发动机的工作电流从4A增大至12A时,原发动机的比冲为980~1323Ns/kg,新发动机比冲为1450~1627Ns/kg。相同工况下,原发动机效率为21%~23%,新发动机效率为32%~53%。实验结果说明再生冷却技术能显著提高低功率电弧加热发动机的效率。
Low-specific-arc-heated engines have low specific impulse and improving engine efficiency is very important for the successful application of low-power arc-heated engines. Based on the original arc heating engine, this paper improves on the design of an annular cavity covering the engine anode to form a regenerative cooling channel. In the experiment, argon was used as a propellant, and the specific impulse and efficiency of the engine were compared with that of the original arc heating engine under typical operating conditions. When the engine operating current increased from 4A to 12A, the original engine specific impulse 980 ~ 1323Ns / kg, the new engine specific impulse 1450 ~ 1627Ns / kg. The same conditions, the original engine efficiency of 21% to 23%, the new engine efficiency of 32% to 53%. Experimental results show that regenerative cooling technology can significantly improve the efficiency of low-power arc heating engine.