Optimal Terminal Shock Position Under Disturbances for Ramjet Supercritical Operation

Park, Jung‐Woo; Park, Iksoo; Seo, Bong-Gyun; Sung, Hong-Gye; Ananthkrishinan, Narayan; Tahk, Min-Jea

doi:10.2514/1.b34431

Cited by 7 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These assumptions make a drop in model accuracy, but enable an analytical investigation, and similar assumptions have been made by many other authors. (26,(30)(31)(32)(33)(34) Under the preceding assumptions, a ramjet engine has three operation modes, i.e., scramjet mode (S), ramjet mode (R), and inlet unstart (U) as shown in Fig. 2.…”

Section: Low-order Dynamic Modelmentioning

confidence: 99%

Combustor-inlet interactions in a low-order dynamic model of ramjet engines

Liu

Cui

2020

Aeronaut. j.

View full text Add to dashboard Cite

The coexistence of multiple stable states is indicative of self-organising processes occurring in the course of the combustor-inlet interactions in a ramjet engine and give rise to the appearance of various nonlinear phenomena. This paper provides a dynamic model that can describe the multiple stable states and the corresponding nonlinear effects to further investigate the dynamic interactions between combustor and inlet in a ramjet engine. Our study shows the whole engine can display distinct dynamic behaviours ranging from irreversibility to hysteresis and to various mode transitions, depending on different physical parameters. With the model, we also illustrate the role of the instability of the normal shock wave in impacting the whole engine’s nonlinear dynamics. Additionally, we extend the previous studies of the classification of combustor-inlet interactions from a static framework to a dynamic framework, which helps to clarify the transient processes of the nonlinear interactions. This work offers a quantitative illustration of the combustor-inlet interactions in a ramjet engine by revealing its nonlinear dynamics and associated characteristics, therefore advancing our understanding of the nonlinear phenomena that exhibit in ramjet engines.

show abstract

Section: Low-order Dynamic Modelmentioning

confidence: 99%

Combustor-inlet interactions in a low-order dynamic model of ramjet engines

Liu

Cui

2020

Aeronaut. j.

View full text Add to dashboard Cite

show abstract

“…This approach has been used so far largely for pure ram/scramjet engine models. [8][9][10] In this work, a similar approach is used for the considerably more complex DCR configuration to derive a low-order model that can be used for engine design and analysis.…”

Section: Introductionmentioning

confidence: 99%

Dual combustor ramjet engine dynamics modeling and simulation for design analysis

Wadwankar¹,

Kandasamy²,

Ananthkrishnan³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

Self Cite

View full text Add to dashboard Cite

An integrated low-order, medium-fidelity model for a dual combustor ramjet engine configuration is derived for use in mission analysis and controller design. Each of the individual components – intake, isolator, ram diffuser and combustor, scram combustor and nozzle – are modeled using either empirical data or analytical relations, or in case of the two combustors by using a quasi-one-dimensional code. The components are appropriately linked to capture the key physical phenomena inherent in the dual combustor ramjet engine operation and the ongoing dynamic processes. Feedback loops due to the upstream influence of the pressure and time lags due to acoustic and flow-related delays are modeled. Sample results are generated for a dual combustor ramjet engine configuration with Jet-A fuel at a design condition of Mach 7 at 27.5 km altitude, and stability and dynamic behavior, steady-state performance, and response to fuel throttling input are assessed. Its low order and the ability to be easily reconfigured for a new geometry/parametric input make the model useful for mission analysis studies with a quick turn-around time.

show abstract