2-D Transient CFD Model of an Isolator Shock Train

Hoeger, Troy Christopher; King, Paul I.; Donbar, Jeffrey; Cox-Stouffer, S.

doi:10.2514/6.2011-2221

Cited by 10 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…al have used a 2-D transient computational model with back pressure as a time-dependent input to predict the location of a normal shock train in a Mach 1.8 inflow. 13 They found that when a large instantaneous back pressure is applied, the shock train first propagates upstream (against the incoming flow) with speeds up to 300 m/s. The shock train overshoots and then travels back downstream to its final rest position at up to 20 m/s.…”

Section: Introductionmentioning

confidence: 99%

Response of a shock train to downstream back pressure forcing

Klomparens

Driscoll

Gamba

2016

54th AIAA Aerospace Sciences Meeting

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Response of a shock train to downstream back pressure forcing

Klomparens

Driscoll

Gamba

2016

54th AIAA Aerospace Sciences Meeting

View full text Add to dashboard Cite

“…There is no evidence of overshoot as the shock train reaches its upstream location as previous investigators have observed for faster actuation speeds. 13 Experiments and computations by Hoeger et al 13 suggest that the overshoot is a function of the rate at which the control surface changes. Thus, the lack of overshoot in the current experiments could be due to the relatively slow valve speed.…”

Section: B Description Of the Pressure And Shock System Response To mentioning

confidence: 99%

“…Few studies have examined the detailed shock motion induced by back pressure forcing. Hoeger et al 13 used a 2-D transient computational model to compare the propagation of the shock train in Mach 1.8 flow due to different back pressure forcing rates. They found that when a large instantaneous back pressure is applied, the shock train first propagates upstream (against the incoming flow) with speeds up to 300 m/s.…”

Section: B Previous Research On Shock Train Forcingmentioning

confidence: 99%

Periodic forcing of a shock train in Mach 2.0 flow

Hunt

Driscoll

Gamba

2017

55th AIAA Aerospace Sciences Meeting

View full text Add to dashboard Cite

High-speed schlieren movies and pressure measurements are collected to analyze the response of a shock train due to downstream forcing. The shock train is generated in a Mach 2.0 ducted flow and controlled by a downstream butterfly valve. Cyclic opening and closing of the valve (at rates up to 10 Hz) leads to oscillations in back pressure measured at the end of the duct. Subsequently, the shock train oscillates between two locations in the duct, traveling at speeds up to 3.5 m/s. Different cases with varied forcing frequency and magnitude of back pressure change are studied. For each case we evaluate the response of the back pressure and shock location by quantifying the magnitude of change, rise time, delay time, and maximum rate of change. Some of the key results include: 1) there is a linear relationship between the magnitude of the shock displacement and the back pressure change that is independent of the forcing parameters; 2) the leading shock in the shock train responds to forcing ≈6 ms after the back pressure starts to change indicating an upstream propagating disturbance; 3) the rise time of the back pressure and leading shock location are approximately the same.

show abstract

Numerical Study of Shock Train in the Isolator of Scramjet Engine

Fang

Yao

Fang

2020

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

The isolator of scramjet engine has to separate the combustor from the inlet so that the scramjet can keep working stably. The steady-state flow field structure, the shock train shape and the starting position of the symmetrical model of isolator under different backpressure ratio are obtained by numerical simulation of commercial software fluent. Using the user-defined function to simulate the pressure fluctuation caused by the irregular heat release in the combustion chamber, the motion of the shock train in the isolation section is obtained. It is found that the start position of the shock train is larger than that of the steady state simulation, which provides a reference for the design of the combustion chamber.

show abstract

2-D Transient CFD Model of an Isolator Shock Train

Cited by 10 publications

References 5 publications

Response of a shock train to downstream back pressure forcing

Response of a shock train to downstream back pressure forcing

Periodic forcing of a shock train in Mach 2.0 flow

Numerical Study of Shock Train in the Isolator of Scramjet Engine

Contact Info

Product

Resources

About