Control-Oriented Model for Intake Shock Position Dynamics in Ramjet Engine

Park, Ik Soo; Kim, Sun-Kyoung; Yeom, Hyo-Won; Sung, Hong-Gye; Park, Jung‐Woo; Tahk, Min-Jea

doi:10.2514/1.53839

Cited by 1 publication

(1 citation statement)

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“…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.

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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.

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