Studies of detonation transition in a gradual area expansion for multi-cycle PDE applications

Saretto, S.; Lee, Seong-Young; Brumberg, Justin; Conrad, Chris; Pal, Snehanshu; Santoro, Robert J.

doi:10.1016/j.proci.2004.08.209

Cited by 12 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that an overdriven detonation wave can occur from a DDT process [7,17], direct initiation [18], or SDT. The overdriven detonation wave can also be attained with a CJ detonation wave propagating into a converging channel due to reflection of the detonation wave [19].…”

Section: Preliminary Test: Overdriven Detonation In Ddtmentioning

confidence: 99%

Experimental study on transmission of an overdriven detonation wave from propane/oxygen to propane/air

Lai

Chung

et al. 2008

Combustion and Flame

View full text Add to dashboard Cite

Section: Preliminary Test: Overdriven Detonation In Ddtmentioning

confidence: 99%

Experimental study on transmission of an overdriven detonation wave from propane/oxygen to propane/air

Lai

Chung

et al. 2008

Combustion and Flame

View full text Add to dashboard Cite

“…Fundamental understanding of these processes is necessary to advance combustion technologies and avoid the harmful impacts of such conditions [5][6][7]. One strategy to study these effects has been to develop laboratory-scale, gas turbine model combustors (GTMCs) that represent the flow structure, geometry, and other complexities found in systems of practical relevance [8][9][10][11][12]. As such, the Dual-Swirl GTMC (developed at the German Aerospace Center, DLR) has become a widely-used platform for detailed experimental and numerical investigations of these very important flows.…”

Section: Introductionmentioning

confidence: 99%

5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 2. Analysis of swirl flame dynamics

Slabaugh

Dennis

Boxx

et al. 2016

Combustion and Flame

View full text Add to dashboard Cite

We have performed a detailed analysis of the temperature field in a turbulent swirl flame operating with a self-excited thermo-acoustic instability. The temperature field was measured using 5 kHz chirpedprobe-pulse (CPP) femtosecond (fs) coherent anti-Stokes Raman scattering (CARS). The measurements are described in detail in the part 1 companion article. In this paper, part 2, a detailed analysis of the time-resolved temperature measurements and simultaneous pressure measurements is performed to provide insight into the dynamics and structure of the swirl-stabilized flame. This work is the first to capture the dynamics of the flame, flow, and coupled flow-flame processes using high-fidelity, spatially-and temporallyresolved thermometry in a flame of practical relevance. The time-averaged contour plot of the temperature field indicates that the flame is very flat and stabilizes approximately 10 mm downstream of the burner face. In this region, there are very significant temperature fluctuations indicating a very high level of unsteadiness. The temperature probability distribution functions (PDFs) are clearly bimodal in this region near the injector face. A Fourier analysis of the temperature time series revealed multiple coherent oscillatory modes. The strongest oscillation was found to be coherent and in-phase with an acoustic resonance at 314 Hz, as expected from the Rayleigh criteria for the unstable flame. An analysis of the phase-conditioned average temperature fields show clearly an axial pumping of low-temperature reactants, which are consumed after a convective delay and result in a spike in the global heat-release rate. Continued analysis also revealed a 438 Hz oscillation that was found to correspond with the dynamics of convective transport by a helical precessing vortex core (PVC). The structure of the PVC, and its interaction with the flame, were studied based on the presence of this characteristic frequency in the power spectral densities computed throughout the flow. The precision and time-resolution of the CPP fsCARS measurements was also sufficient to enable computation of the integral timescales as well as the PDFs of the temporal temperature gradients. A sample of state space trajectories were used to provide insight into the nature of coupling between the narrowband acoustic resonance and the broadband spectrum of turbulent flame processes.

show abstract

“…As a typical jet engine with detonation mode, pulse detonation engine attracted a lot of attentions [1][2][3]. In many researches, some focused on optimization of deflagration to detonation transition [4][5][6], some concentrated on enhancement for conversion of heat energy into kinetic energy [7][8][9][10]. As for the latter, the widespread used evaluation targets were thrust and specific impulse.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Impulse Characteristics of PDRE with Exhaust Measurements

Wang

et al. 2014

International Journal of Turbo &Amp; Jet-Engines

View full text Add to dashboard Cite

The exhaust characteristics related to impulse was investigated in a pulse detonation rocket engine (PDRE) by tunable diode laser absorption sensing system. The instantaneous parameters of temperature, velocity and pressure were obtained for exhaust at engine exit. Analysis on impulse characteristics based on control volume of the PDRE was conducted for a single operation circle with experimental results. It was concluded that the impulse (3.26 N⋅s) achieved by exhaust measurements was in agreement with that (3.09 N⋅s) by a load cell. The impulse caused by exhaust momentum experienced an extremely sharp ascending, a steep rising and a slow increment in sequence. The exhausts during the sharp ascending and steep rising were under expansion with high mass weighted average temperature (>1266 K), so there was a possible promotion for exhausts utilizing.

show abstract

Studies of detonation transition in a gradual area expansion for multi-cycle PDE applications

Cited by 12 publications

References 17 publications

Experimental study on transmission of an overdriven detonation wave from propane/oxygen to propane/air

Experimental study on transmission of an overdriven detonation wave from propane/oxygen to propane/air

5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 2. Analysis of swirl flame dynamics

Analysis on Impulse Characteristics of PDRE with Exhaust Measurements

Contact Info

Product

Resources

About