基于LabVIEW虚拟仪器技术的湍流等离子体束热效率

Thermal Efficiency of a Turbulent Plasma Jet by Using LabVIEW Virtual Instrument Technology

为明确不同参数下等离子体发生器的热效率,并精准掌握等离子体束的实时能量,进而将等离子体技术应用于氮化铝粉体等材料制备领域,基于自行研制的两路进气式湍流等离子体发生器,利用虚拟仪器技术以实验方式实现对湍流等离子体束热效率在不同工作参数组合下的实时在线监测,并分析了其热效率特性。实验结果表明:热效率在保护气不变的情况下随主气的增大从51%增加到67%,而在主气不变的情况下,保护气的增大会使热效率呈现先增加后降低的现象。在其他工作参数相同的条件下,70 A电流下的热效率比100 A电流下的热效率高4%左右。

In order to clarify the thermal efficiency of plasma torch under different working parameters,so as to accurately get the real-time energy of plasma jet,and then applying plasma technology to the preparation of aluminum nitride powders and other materials,based on a self-developed plasma torch working with two gas injections,the real-time online thermal efficiency of the proposed plasma torch was monitored by using virtual instrument technology,and the thermal efficiency characteristics was analyzed and discussed.The experimental results show that with a fixed working current,the thermal efficiency increases from 51%to 67%with increasing the main gas injection flow-rate,while it increases first and then decreases with increasing the protective gas injection flow-rate.The thermal efficiency of the proposed plasma torch working with a work current of 70 A is higher about 4%than that at 100 A.