Experimental Analysis of Pulse Detonation Engine Performance by Pressure and Momentum Measurements

Kasahara, Jiro; Arai, T.; Matsuo, Akiko

doi:10.2514/6.2003-893

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Schauer et al 3 and Kasahara et al 6 investigated effects of the fuelfill fraction α, where the stoichiometric H 2 -air and H 2 -O 2 mixtures were used, respectively. In Figs.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

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Numerical Studies on Specific Impulse of Partially Filled Pulse Detonation Rocket Engines

Sato

Matsuo

Endo

et al. 2006

Journal of Propulsion and Power

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Performance analyses of pulse detonation rocket engines (PDREs) were numerically studied, focusing on partialfill effects at ground tests. The initial detonable mixture, inert gas, fuel-fill fraction, equivalence ratio, and initial temperature of inert gas were changed as governing parameters. The simulation results were compared against those of previous studies and agreed well with them. The simulation results indicated that the initial mass fraction of the detonable mixture to total mass of the gas was the predominant factor for the specific impulse of partially filled PDREs. Based on the numerical results, a new, simple empirical formula is proposed to predict the specific impulse of partially filled PDREs.

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“…Schauer et al 3 and Kasahara et al 6 investigated effects of the fuelfill fraction α, where the stoichiometric H 2 -air and H 2 -O 2 mixtures were used, respectively. In Figs.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…They showed that the deflagration-to-detonation transition process and I sp were affected by the change of equivalence ratio. Kasahara et al 6,7 examined effects of the inert gases in partially filled detonation tubes by using air and helium gases. They clarified that the change of inert-gas species greatly affects I sp .…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies on Specific Impulse of Partially Filled Pulse Detonation Rocket Engines

Sato

Matsuo

Endo

et al. 2006

Journal of Propulsion and Power

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“…e e i (9) where is the empirically determined energy efficiency (see the subsequent section entitled Energy Efficiency). Assuming the isentropic expansion of the pressurized gas,…”

Section: Gurney Modelmentioning

confidence: 99%

“…OTIVATED by recent interest in pulse detonation engines [1], a number of researchers [2][3][4][5][6][7][8][9][10][11][12] have studied the impulse from a partially filled detonation tube. In these experiments and analyses, a portion of the detonation tube near the closed end (thrust surface) contains the combustible mixture whereas the remaining portion of the tube up to the open end contains an inert gas mixture, for example, air.…”

Section: Introduction Mmentioning

confidence: 99%

Impulse Generation by an Open Shock Tube

et al. 2008

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We perform experimental and numerical studies of a shock tube with an open end. The purpose is to investigate the impulse due to the exhaust of gases through the open end of the tube as a model for a partially filled detonation tube as used in pulse detonation engine testing. We study the effects of the pressure ratio (varied from 3 to 9.2) and the volume ratio (expressed as fill fractions) between the driver and driven section. Two different driver gases, helium and nitrogen, and fill fractions between 5 and 100% are studied; the driven section is filled with air. For both driver gases, increasing the pressure ratio leads to larger specific impulses. The specific impulse increases for a decreasing fill fraction for the helium driver, but the impulse is almost independent of the fill fraction for the nitrogen driver. Twodimensional (axisymmetric) numerical simulations are carried out for both driver gases. The simulation results show reasonable agreement with experimental measurements at high pressure ratios or small fill fractions, but there are substantial discrepancies for the smallest pressure ratios studied. Empirical models for the impulse in the limits of large and small fill fractions are also compared with the data. Reasonable agreement is found for the trends with fill fractions using the Gurney or Sato model at large fill fractions, but only Cooper's bubble model is able to predict the small fill fraction limit. Computations of acoustic impedance and numerical simulations of unsteady gas dynamics indicate that the interaction of waves with the driver-driven gas interface and the propagation of waves in the driven gas play an essential role in the partial-fill effect.

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“…In the direct thrust generation mode, detonation tubes can be operated either completely or partially filled with combustion gases. The specific impulse is observed by a number of researchers [2][3][4][5][6][7][8][9][10][11][12][13] to be greater when the detonation tube is partially-filled instead of completely filled. In these "partial fill'' experiments and analysis, a portion of the detonation tube near the closed end (thrust surface) contains the combustible mixture while the remaining portion of the tube up to the open end contains an inert gas mixture, .e.g., air.…”

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confidence: 99%

Impulse Generated by a Shock Tube in a Vacuum

Takashima

Kasahara

Shepherd

et al. 2008

46th AIAA Aerospace Sciences Meeting and Exhibit

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Detonation tube specific impulse increases with decreasing ambient pressure for fullyfilled conditions in a sub-atmospheric environment. In the present study, we use an openend shock tube to simulate a detonation tube and investigate the dependence of the specific impulse on the propellant fraction, i.e., partial filling, in vacuum operation. The impulse is experimentally determined by hanging the shock tube in a ballistic pendulum arrangement inside a vacuum chamber. The shock tube driver section has a fixed length of 0.1 m and is filled to 1 MPa with various gases including helium, hydrogen, nitrogen, argon, and sulfur hexafluoride. The pressure inside the vacuum chamber is 5 Pa. The shock tube had constant area and different lengths (0-1.2 m) of the open-end driven sections (extension tubes) are used to vary the fraction of gas filling the shock tube (fill fraction) between 7.8% and 100%. The specific impulse is a weak function of extension tube length but varies * = specific impulse scaling parameter I sp (l) = specific impulse of a shock tube with an extension tube of length l L = non-dimensional length

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Experimental Analysis of Pulse Detonation Engine Performance by Pressure and Momentum Measurements

Cited by 5 publications

References 7 publications

Numerical Studies on Specific Impulse of Partially Filled Pulse Detonation Rocket Engines

Numerical Studies on Specific Impulse of Partially Filled Pulse Detonation Rocket Engines

Impulse Generation by an Open Shock Tube

Impulse Generated by a Shock Tube in a Vacuum

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