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本文总结了螺栓挤压推力终止系统(BETTS)的设计、研制和验证试验。该系统在阿诺德工程研制中心(AEDC)进行了多次冷试,一次海平面热试和两次高空点火推力终止试验,试验所用的发动机是政府向化学系统分公司提供的“民兵”发动机空壳体装药后制成的。通过大发动机热试,证明本计划所验证的这种BETTS可以消除前部碎片,大大地简化药柱和发动机壳体的设计,提高末级性能。另外,这种方法设计简单,从而可以降低推进系统的成本。BETTS用爆炸螺栓和挤压螺栓的组合代替连接喷管法兰和发动机壳体法兰的普通螺栓。接到指令后,爆炸螺栓立即打开,喷管循着挤压螺栓向后平移,发动机气体迅速排出,从而使推进剂熄火。挤压螺栓控制着喷管的移动速度和最大运动行程。以前根据NO.F04611—75—C—0044合同(CSD计划2549)曾成功地在缩比发动机上进行了BETTS热试和在飞行重量的“民兵”Ⅲ第三级发动机上进行了冷试。
This paper summarizes the design, development and validation of the bolt thrust thrust termination system (BETTS). The system conducted several cold tests, a sea level thermal test and two high-altitude ignition thrust termination tests at the Arnold Engineering Development Center (AEDC). The engine used in the test was the “militia” engine shell provided by the government to the Chemical Systems Division Body made after the charge. The large hot engine test proved that the BETTS verified by this program can eliminate the front debris and greatly simplify the design of the column and the engine casing to improve the final performance. In addition, this method is simple to design, which can reduce the cost of propulsion system. BETTS replaces normal bolts connecting the nozzle flange with the engine housing flange with a combination of explosive and extruded bolts. Immediately after receiving the command, the explosion bolt is opened and the nozzle is translated backwards by pressing the bolt, so that the engine gas is rapidly discharged and the propellant is extinguished. Extrusion bolts control the nozzle speed and maximum stroke movement. Previously, a BETTS thermal test was conducted on a reduction ratio engine and a cold test on a “Militia” III third stage engine at the flying weight was previously performed under contract NO. F04611-75-C-0044 (CSD Program 2549).