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Effect of Throttling on Dual-Bell Sneak-Transition Side Loads
Journal of Propulsion and Power ( IF 1.9 ) Pub Date : 2021-04-23 , DOI: 10.2514/1.b38095
Shashi B. Verma 1 , Oskar J. Haidn 2
Affiliation  

An experimental investigation has been conducted on a subscale dual-bell nozzle to study the effect of throttle settings on sneak-transition side loads. The results are from a cold-gas test campaign conducted in a high-altitude simulation chamber for three throttle settings of 1, 2, and 3 bar/s. An analysis is carried out by correlating the simultaneously acquired side-load measurements and real-time wall pressure data from transducers mounted in the vicinity of the wall inflection. The study reveals that the longer is the time duration of separation front in the region of wall inflection, the higher is the amplitude of overall sneak-transition side loads. Increasing the throttle settings from 1 to 3 bar/s significantly reduces not only the overall sneak-transition duration but also the amplitude of flow unsteadiness in the region of wall inflection during the intermittent flow condition of the sneak transition and, hence, the associated side loads. It is further observed that even though the total transition time decreases with an increase in throttle settings, the actual transition side-load peak amplitude remains more or less similar irrespective of throttle setting.



中文翻译:

节流对双向铃音过渡过渡侧负载的影响

已经对一个小规模的双钟形喷嘴进行了实验研究,以研究节气门设置对过渡过渡侧载荷的影响。结果来自在高空模拟室内进行的冷气测试活动,针对三种油门设置分别为1、2和3 酒吧/s。通过将同时获取的侧向载荷测量值与安装在壁弯附近的换能器的实时壁压数据进行关联,可以进行分析。研究表明,在墙体拐弯区域中,分离锋的持续时间越长,整体潜行过渡侧向载荷的幅值就越高。将油门设置从1增加到3 酒吧/s这不仅显着减少了整个潜行过渡持续时间,而且还减少了在潜行过渡的间歇流动条件下壁变形区域内流动不稳定的幅度,并因此减少了相关的侧向载荷。进一步观察到,即使总的过渡时间随着节气门设置的增加而减少,实际的过渡侧负荷峰值幅度仍大致相同,而与节气门设置无关。

更新日期:2021-04-23
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