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为了提高大型氢/氧发动机推力室燃烧稳定性方面的技术,在马歇尔飞行中心的先进试验设备上对航天飞机主发动机进行了稳定性鉴定试验。马歇尔试验计划的目的是研究改进型航天飞机主发动机的燃烧稳定性。这种改进型航天飞机主发动机取消了飞行型推力室的全部稳定装置,而推力室喉部面积比飞行型航天飞机主发动机推力室的加大了12％。在8次热试车的启动瞬间和进入主级工作阶段,利用两个稳定性鉴定快速压力振荡器或称为脉冲枪,打算在燃烧室內激发起声振振型。利用高频测试设备测定压力振荡并确定燃烧室的稳定工作范围。利用衰减时间判定燃烧室的稳定特性。为了确保操作安全并保护试验件不受破坏,我们采用了一种危险界限制度。由于燃烧过程的阻尼特性极大, 所以, 在燃烧室内不能激发起明显的声振振型,而且,包括机械振动在内的全部振动都会衰减到化学推进情报机构(CPIA)对每一种燃烧室振型要求的范围内。本报告介绍了该项计划的成果,讨论了所得到的数据的使用价值,介绍了稳定性鉴定装置的尺寸和安装位置,介绍了分析方法和试验结果。
In order to improve the combustion stability of the large hydrogen / oxygen engine thrust chamber, the stability test of the space shuttle main engine was carried out on the advanced test equipment of the Marshall Flight Center. The purpose of the Marshall Pilot Project is to study the combustion stability of the main engine of the improved space shuttle. The improved shuttle’s main engine canceled all stabilizers in the flight-type thrust chamber, while the thrust chamber throat area increased by 12% over the thrust space of the main shuttle of the space shuttle. At the start of the eight hot test runs and into the main stage of operation, two stability appraisals of rapid pressure oscillators, or pulse guns, are intended to excite the acoustic modes in the combustion chamber. Use high-frequency test equipment to measure pressure oscillations and determine the stable operating range of the combustion chamber. Decay time to determine the stability of the combustion chamber. To ensure safe operation and to protect test pieces from damage, we have adopted a system of hazard limits. Due to the extreme damping characteristics of the combustion process, significant acoustic vibration modes can not be excited in the combustion chamber and all vibrations, including mechanical vibrations, are dampened to the extent that the CPIA, for each combustion chamber Mode of vibration within the required range. This report presents the results of the program, discusses the value of the data obtained, describes the size and installation location of the stability appraisal device, and introduces the analytical methods and test results.