Flow separation and side-load behavior of truncated ideal rocket nozzles

Wall Pressure and External Velocity Field Relation in Overexpanded Supersonic Jets

“…Truncated Ideal Contour, TIC, and conical nozzles only display FSS separation regimes while Thrust Optimized Contour, TOC, and Thrust Optimized Parabolic, TOP, nozzles can display both FSS and RSS regimes depending on the nozzle pres-sure ratio [27]. Since the early work of Schmucker [37], it is commonly suggested that side loads in the FSS regime mainly result from oscillations of the internal shock pattern within the nozzle [11,20,27,1] while in mixed regimes a peak of side-loads is observed for NPR corresponding to the transition FSS-RSS [47,45,26]. A detailed description of the classical FSS regime in an over-expanded nozzle can be found in Hagemann et al [15].…”

Details of Side Load Test Data and Analysis for a Truncated Ideal Contour Nozzle and a Parabolic Contour Nozzle

“…In the 1990's several European organizations joined together as the Flow Separation Control Devices research group to address nozzle side loads. Several experimental and analytical programs were completed that provided new and valuable insight into the nozzle fluid dynamics that are responsible for nozzle side loads 4,5 . However, in the U.S., there was no organized program addressing liquid rocket nozzle side loads.…”

Structural dynamics of the large thrust liquid rocket engines

“…喷管侧向力产生的本质是由于流动不稳定, 产生 原因可分为3大类 [46,50] [51] 和流固耦合因素, 当侧向力较大时, 将引起侧向力与喷管变形的气动弹 性耦合 [52,53] . 为建立一个可以预估火箭喷管分离流动 侧向载荷的精确模型, MSFC的工程师在2000年启动 图 10 (网络版彩图)发动机整机动力学模型 http://engine.scichina.com/doi/10.1360/SSPMA2018-00103…”