Performance Characterization of a Natural Gas-Air Rotating Detonation Engine at Elevated Pressure

Walters, Ian V.; Journell, Christopher L.; Lemcherfi, Aaron; Gejji, Rohan; Heister, Stephen D.; Slabaugh, Carson D.

doi:10.2514/6.2019-4214

Cited by 18 publications

(3 citation statements)

References 23 publications

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“…In Figure 6, the total pressure and pressure gain measured by the Kiel probe method and the Mach-corrected CTAP method are compared. Walters et al [21] proposed using the exit throat area to oxidizer injection area 𝐴 8 /𝐴 3.1 to analyze the influence of the geometry on the RDC performance. In this study, a 0% outlet restriction combined with the 1 mm air gap corresponds to 𝐴 8 /𝐴 3.1 = 3.479, likewise a 50% outlet restriction combined with the 1 mm air gap corresponds to 𝐴 8 /𝐴 3.1 = 1.7395.…”

Section: Resultsmentioning

confidence: 99%

Experimental Comparison of Different Pressure Gain Measurement Techniques for RDCs

Kayser

Wei

Bach

et al. 2023

AIAA SCITECH 2023 Forum

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Rotating Detonation Combustors (RDC) feature an inherently unsteady internal flow field with characteristic frequencies in the kHz range, which makes accurately quantifying the achieved pressure gain challenging. The present study therefore considers three methods to determine the stagnation pressure of the high-enthalpy outlet flow: Mach-corrected Capillary Tube Averaged Pressure (CTAP) measurements of 𝒑 t,4 , direct Kiel probe measurements of 𝒑 t,8 , and Equivalent Available Pressure (EAP) measurements using a thrust stand. The methods differ significantly in their relative accuracy and the amount of required instrumentation. A parametric study with all three approaches was conducted at TU Berlin over a range of configurations and operating conditions to compare the acquired data. To this end, a 5 kN class thrust stand was used along with a calibration method and base drag measurement setup. Further, a low Mach number correction was implemented for Mach-corrected CTAP and EAP data at conditions where the M 8 = 1 assumption breaks down. The EAP data displays the highest amount of scattering due to the large number of calibration that need to be taken into account. The base drag pressure distribution on the outlet flanges, which can amount to 12.78% and more of EAP, varies significantly with the operating condition. All three methods generally agree well with one another, with EAP being the most conservative. Kiel probe measured stagnation pressure is on average about 5% higher than EAP and 3% higher than the Mach-corrected 𝒑 t,4 . This underlines that methods with reduced instrumentation may be useful for pressure gain estimation. Nevertheless, it also shows that a standardized data reporting method may be required in the community to compare different experiments.

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Section: Resultsmentioning

confidence: 99%

Experimental Comparison of Different Pressure Gain Measurement Techniques for RDCs

Kayser

Wei

Bach

et al. 2023

AIAA SCITECH 2023 Forum

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“…The reader is referred to the previous paper for a more detailed description of the heat release mechanism. We use the standard station designation as proposed by others [5,14,15] for this paper, with the air plenum as station no. 2, the air injector throat station no.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Geometric RDC Dependencies Using a Fast Reactive Euler Solver

Garan

Bach

Paschereit

et al. 2023

AIAA SCITECH 2023 Forum

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A time resolved, two-dimensional reactive Euler solver is employed to simulate Rotating Detonation Combustion (RDC). The influence of combustor diameter, axial length, combustion annulus mass flux, outlet throat area, and air injector area on the flow field geometry and performance is studied. There is a similarity in the unsteady outlet state for cases at equal combustor aspect ratio. It is demonstrated that generalization of Equivalent Available Pressure methodology for the non-constant heat capacity ratio case is not trivial and can introduce significant errors. To bypass this issue, an alternative approach for performance quantification is introduced. Mass flux and outlet throat area are found to have a significantly stronger effect on performance compared to diameter and axial length. Yet, the influence of the latter two is significant. The angle of the oblique shock is quantified and is shown to correlate with the ratio of detonation height and axial combustor length. The results suggest that entropy generation due to shock processing is the driving mechanism behind performance deviation due to changes in combustor diameter and axial length. Approximate predictions about the shock processing can be made using geometric dependencies of the flow field.

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“…Zhdan et al 5 comprehensively summarized the characteristics of RDW fueled by gaseous fuels and analyzed the influencing parameters of the RDW. Walters et al 6 studied the performance of the RDC fueled by natural gas. Compared with the hydrogen, ethylene, acetylene and other gaseous fuels, it is more difficult to directly initiate the stable rotating detonation with the liquid kerosene and pure air.…”

Section: Introductionmentioning

confidence: 99%

Investigation of rotating detonation fueled by pre-combustion cracked kerosene under different channel widths

Yang

Zhong

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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In this study, the effects of channel widths on the characteristics of the rotating detonation wave (RDW) were investigated. Pre-combustion cracked kerosene and 50% oxygen-enriched air were taken as the propellant. Keeping the outer diameter ( D = 150mm) constant, the channel widths ( W) of the combustor range from 15 mm to 50 mm in the experiments. The results indicate that the time for the formation of a stable RDW is longer under the wider channel, while the velocity of the RDW increases significantly with a wider channel. Increasing the ER has a positive effect on the wave velocity and the flow rate has little effect on wave velocity. The wave pressure increases under the higher ER and flow rate. Under the same flow rate and ER, the RDW pressure tends to reach the maximum value when the channel width is 25 mm, and the pressure range is 2 bar to 6 bar. Five kinds of the RDW modes were observed in the experiments, namely the failure “pop-out”, single-wave mode, two-counter rotating waves mode, and two-co rotating waves mode. The two-counter rotating waves mode seems to be an intermediate mode of single-wave mode and two-co rotating waves mode in the conducted experiments, and the multi-wave mode is more likely to occur under the narrower channel and the higher oxygen content.

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Performance Characterization of a Natural Gas-Air Rotating Detonation Engine at Elevated Pressure

Cited by 18 publications

References 23 publications

Experimental Comparison of Different Pressure Gain Measurement Techniques for RDCs

Experimental Comparison of Different Pressure Gain Measurement Techniques for RDCs

Investigation of Geometric RDC Dependencies Using a Fast Reactive Euler Solver

Investigation of rotating detonation fueled by pre-combustion cracked kerosene under different channel widths

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