Reaction Ratio and Nozzle Expansion Effects on the PDE

Dyer, R.; Kaemming, Thomas A.; Baker, R.O.

doi:10.2514/6.2003-4514

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Equivalence ratio also has a significant impact on the performance of PDEs, however, much of the research available regarding this topic focuses on an overall idealized equivalence ratio for the entire system as shown in Figure 2.15 24 . As expected, hydrogen-air equivalence ratios less than one produce less thrust, yet the thrust initially decreases at a slower rate producing increased efficiencies.…”

Section: Equivalence Ratiomentioning

confidence: 99%

Intake Flow Analysis of a Pulsed Detonation Engine

Strafaccia

2016

Journal of Engineering for Gas Turbines and Power

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A CFD program is converted and modified to explore unsteady flow within the intake system of a pulse detonation engine (PDE). Using a quasi-one-dimensional approach the program provides insight into the unsteady nature of localized equivalence ratios to include their effects on PDE performance. The original FORTRAN program is converted into the MATLAB architecture, taking full advantage of user availability and post processing convenience. The converted program was validated against the original program and modified to include a primitive intake manifold system with a single fuel injector located approximately 10 feet upstream of the primary intake valve. Constant fuel mass flow rate at the injector end creates local variations in equivalence ratio throughout the PDE that may have significant impact on overall engine performance. The results of the current thesis research suggest that performance effects of up to 21% can be attributed to non-uniform fuel distribution throughout the detonation process and are most prevalent at lower frequencies and fill ratios.iii DEDICATION This thesis is dedicated to my family. In particular, to my wife and daughter who endured the many late nights and long hours needed to fulfill this lifelong academic goal and to my parents who taught me the meaning of hard work, commitment and sacrifice.iv

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Section: Equivalence Ratiomentioning

confidence: 99%

Intake Flow Analysis of a Pulsed Detonation Engine

Strafaccia

2016

Journal of Engineering for Gas Turbines and Power

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“…Impulse augmentation ratio of 1.26 was achieved. Dyer et al [12] examined the effect of fill fraction by using time accurate CFD and Boeing's PDE cycle deck, DECADE. It is shown that as fill fraction is decreased, the efficiency of the cycle is increased.…”

mentioning

confidence: 99%

“…While the PDE presents a mechanically simple device, its unsteady thermo-fluid dynamics are quite complex. As may be expected with such a relatively new technology, the study on the approaches for achieving optimum design and performance is only at the initial stage and needs further exploration.In the past few years, numerous studies on the effects of partial mixture filling on PDE performance have been reported analytically, numerically and experimentally [5][6][7][8][9][10][11][12] . Zitoun et al [5] measured the single-cycle impulse of ethylene-oxygen mixtures under standard conditions in a detonation tube and an extension with the same cylindrical cross section.…”

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confidence: 99%

Experimental investigation of effect of partial filling on the impulse of pulse detonation engine

et al. 2007

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Using poor-detonable liquid C 8 H 16 /air mixture with low-energy system (total spark energy of 50 mJ) and a new one-step detonation initiation method developed in this study, partial-tube fill experiments have been conducted in a fixed length PDE tube with a fuel/air mixture section of different length, covering a wide range of the detonation tube fill fraction (ratio of fuel/air mixture length to tube length). Impulse was calculated by integrating the pressure differential at the closed end of the tube. Based on the results obtained experimentally, it is found that the fuel-based specific impulse declines when fill fraction increases. On the other hand, the total-mixture-based specific impulse rises as fill fraction increases. A multi-cycle partial-fill model is developed to predict the impulse obtained from a partially-filled detonation tube, which is valuable for the optimization of PDE performance.pulse detonation engine, partial filling, impulse, fill fraction Pulse detonation engines (PDE) are new-concept propulsion systems [1][2][3] , which utilize repetitive detonations to produce thrust or power. PDE offers the potential to provide higher performance while simultaneously reducing engine weight, cost and complexity, relative to conventional propulsion systems currently in service. Due to its obvious advantages, worldwide attention has been paid to the scientific and technical issues concerning PDE.Effective optimization is especially important because the PDE is a new engine competing against the well established turbojet and ramjet [4] . Only high installed performance and low cost will justify the investment needed to bring the PDE to production. While the PDE presents a mechanically simple device, its unsteady thermo-fluid dynamics are quite complex. As may be expected with such a relatively new technology, the study on the approaches for achieving optimum design and performance is only at the initial stage and needs further exploration.In the past few years, numerous studies on the effects of partial mixture filling on PDE performance have been reported analytically, numerically and experimentally [5][6][7][8][9][10][11][12] . Zitoun et al. [5] measured the single-cycle impulse of ethylene-oxygen mixtures under standard conditions in a detonation tube and an extension with the same cylindrical cross section. They directly initiated a detonation with approximately 35 J of energy and the impulse was calculated by integrating the thrust surface pressure differential. Schauer et al. [6] studied the effects of the pressure relaxation rate upon thrust experimentally by adjusting the amount of detonable mixture in the tube while maintaining the same detonation tube length. Significant performance gains were observed. Falempin et al. [8] and Cooper et al. [9] used a ballistic pendulum to measure single-cycle impulse values of ethylene-oxygen mixtures in detonation tubes with attached extensions having a constant cylindrical cross section and also in extensions of varying dimensions. Li and Kailasanath [10] s...

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The Thermodynamic and Fluid Dynamic Functions of a Pulsed Detonation Engine Nozzle

Kaemming

Dyer

2004

40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

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Reaction Ratio and Nozzle Expansion Effects on the PDE

Cited by 10 publications

References 8 publications

Intake Flow Analysis of a Pulsed Detonation Engine

Intake Flow Analysis of a Pulsed Detonation Engine

Experimental investigation of effect of partial filling on the impulse of pulse detonation engine

The Thermodynamic and Fluid Dynamic Functions of a Pulsed Detonation Engine Nozzle

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