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用φ50mm标准试验发动机对双基和复合推进剂的发动机点火问题进行以下一系列研究工作:(1)在双基推进剂发动机的初始工作时,喷管堵盖的厚度将如何影响点火压力和点火延迟时间。试验结果表明:堵盖的爆破时间应该是在燃烧室最大压力的75%~100%处,那就是说,较厚的堵盖将得到较好的试验发动机性能。(2)在双基推进剂发动机中,堵盖厚度一定,燃烧室压力为25~115atm,试验结果表明:如果点火压力小于75atm,则某些通用的公式可用来计算点火药量。如利用Barrere和Lancaster公式来计算点火药量时,上面所讲的二个结果是有效的。(3)用一种高能金属氧化剂作点火材料的装药量和复合推进剂发动机的自由容积之间关系,对于不同的Ku,可作成曲线。例如用硼硝酸钾(B/KNO_3)作为点火药,聚酯推进剂作为发动机装药,则在对数坐标上所得曲线是线性的,这样,在点火器设计中易于确定所需烟火剂装药量。
A series of studies were conducted on the engine ignition problems of biodbase and composite propellants using the φ50mm standard test engine: (1) How the thickness of the nozzle plugging affects the ignition pressure and ignition during the initial operation of the twin-base propellant engine delay. The test results show that the burst time of the plug cover should be 75% ~ 100% of the maximum pressure of the combustion chamber, that is to say, the thick plug cover will get a better test engine performance. (2) In double-base propellant engines, the plug cover has a constant thickness and the combustor pressure is 25 to 115 atm. The test results show that if the ignition pressure is less than 75 atm, then some general equations can be used to calculate the ignition charge. When using the Barrere and Lancaster formulas to calculate the ignition dose, the two results above are valid. (3) The relationship between the charge of ignition material with a high-energy metal oxidant and the free volume of the composite propellant engine can be plotted for different Ku. For example, using potassium boron nitrate (B / KNO 3) as the ignition charge and the polyester propellant as the engine charge, the curve obtained on the logarithmic scale is linear so that the required pyrotechnic charge is easily determined in the igniter design the amount.