不同电极材料下ADN基液体推进剂电点火特性的实验研究

目前二硝酰胺铵(ADN)基液体推进剂在工程应用中均采用催化点火燃烧方式,而电点火可以避开催化剂高温失活、冷启动等问题。为了研究ADN基液体推进剂的电点火特性,在密封装置中开展了不同电极材料下推进剂液滴电点火实验,并研究了180V～230V电压范围内液滴着火延迟时间、着火持续时间以及燃烧过程的变化规律。结果表明:ADN基液体推进剂能够通过电阻加热点火方式点燃。采用钨丝电极时,着火延迟时间、着火持续时间和反应总时间均随着电压增加逐渐减小,在230V电压时相对于180V时分别减小了25%,56%和38%。采用钼丝电极时,着火延迟时间在180V～200V范围随着电压增加逐渐降低,在200V～230V电压范围内基本不变;着火持续时间总体上随着电压的增加而呈现略微增加的趋势,但增加幅度较小;反应总时间在180V～230V电压范围内基本稳定在1.5s左右。

Experimental Study of Electrical Ignition Characteristics of ADN-Based Liquid Propellants with Different Electrode Materials

At present, catalytic ignition combustion is used in the application of ammonium dinitrate (ADN) based liquid propellant, while electrical ignition can avoid the problems of catalyst deactivation at high temperature and cold start. In order to study the electrical ignition characteristics of ADN-based liquid propellant, the droplet electric ignition experiments of the propellant were carried out in a sealed device with different electrode materials, and the variation of ignition delay time and combustion duration as well as combustion process were studied within 180~230V. The results show that the ADN-based liquid propellant can be ignited by resistive ignition method. When tungsten wire electrodes are used, the ignition delay time, combustion duration and total reaction time decrease gradually with the increase of voltage. The ignition delay time, combustion duration and total reaction time decrease by 25%, 56% and 38% respectively at 230V voltage compared with 180V voltage. When molybdenum wire electrodes are used, the ignition delay time decreases gradually with the increase of voltage in the range of 180~200V, and remains basically unchanged in the range of 200~230V. On the whole, the combustion duration increases slightly with the increase of voltage, but the increase is small. The total reaction time is basically stable at around 1.5s in the voltage range of 180~230V.