Theoretical Modeling and Numerical Study for Thrust- Oscillation Characteristics in Solid Rocket Motors

Zhang, Qiao; Wei, Zhijun; Su, Wanxing; Li, Junwei; Wang, Ningfei

doi:10.2514/1.57713

Cited by 4 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is then in the best interest of design engineers to avoid having the pressure oscillation frequencies within a rocket engine be close to its resonance frequency. Motors" is used to compare numerical results [3]. In Figure 11 below the engine model with its dimensions in meters are shown.…”

Section: Figure 8 Simple Spring-mass Systemmentioning

confidence: 99%

“…This allows for more flexibility to the possibility of solutions, and allows the option to fix root causes of said problems instead of designing a fix for the symptoms [1]. The goal of this research is to look at an example of a LSCES in depth, perform a forensics study, and present a coupling strength approach from the field of as protrusions in the flow [3]. These sudden transitions cause turbulent flow to form downstream of the protrusion which in turn generates vortex shedding.…”

mentioning

confidence: 99%

“…The structure of the rocket then develops a structural response, where if the dampening factor is greater than the excitation energy generated by the pressure oscillations the vibrations dampen out. In the case where the pressure oscillation frequencies correspond to the resonance frequency of the structure, thrust oscillation occurs [3]. If T/O is not mitigated, the engine chamber may build up a high level of instability, affecting the remaining rocket structure, and eventually propagating up to the crew module as was the case in the Ares 1-X [2].…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Coupling Analysis Approach to Capture Unexpected Behaviors in Ares 1

Kis

View full text Add to dashboard Cite

Coupling of physics in large-scale complex engineering systems must be correctly accounted for during the systems engineering process. Preliminary corrections ensure no unanticipated behaviors arise during operation. Structural vibration of large segmented solid rocket motors, known as thrust oscillation, is a well-documented problem that can effect solid rocket motors in adverse ways. Within the Ares 1 rocket, unexpected vibrations deemed potentially harmful to future crew were recorded during late stage flight that propagated from the engine chamber to the Orion crew module. This research proposes the use of a coupling strength analysis during the design and development phase to identify potential unanticipated behaviors such as thrust oscillation. Once these behaviors and couplings are identified then a value function, based on research in Value Driven Design, is proposed to evaluate mitigation strategies and their impact on system value. The results from this study showcase a strong coupling interaction from structural displacement back onto the fluid flow of the Ares 1 that was previously deemed inconsequential. These findings show that the use of a coupling strength analysis can aid engineers and managers in identifying unanticipated behaviors and then rank order their importance based on the impact they have on value.

show abstract

Section: Figure 8 Simple Spring-mass Systemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

A Coupling Analysis Approach to Capture Unexpected Behaviors in Ares 1

Kis

View full text Add to dashboard Cite

show abstract

“…Thrust oscillation is a well-known phenomenon caused by combustion instabilities within the combustion chamber of a Solid Rocket Motor (SRM). During combustion, turbulent flow is produced from geometric changes inside the combustions chamber, typically caused by a change in wall sizing or any bluff objects protruding into the flow [3].…”

mentioning

confidence: 99%

“…This oscillation may travel upstream and interact with the flow and increasing the instability rate [4]. The rocket's structure will interact with the energy created by the turbulent flow, if the structure's natural response is close to the vortex shedding frequency the excitation of energy generated by pressure oscillation will not dampen out [3]. If not dampened out pressure oscillation will increase in magnitude and therefore thrust oscillation will increase, causing an increase in instability in the propellant flow, and increase in vibrational forces interacting with the structure.…”

mentioning

confidence: 99%