Analysis of Combusting High-Pressure Monopropellant Sprays

Lee, T. W.; Gore, J. P.; Faeth, G. M.; Birk, Avi

doi:10.1080/00102208808923946

Cited by 12 publications

(16 citation statements)

References 4 publications

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“…2 -3 Initial work involved development of a locally homogeneous-flow (LHF) model for combusting HAN-based monopropellants, where interphase transport rates are assumed to be infinitely fast. 2 This approach yielded reasonably good agreement with flow visualization measurements of Birk and Reeves 4 for combusting LGP 1845. 2 However, later evaluation in this laboratory suggested significant separated-flow effects using similar measurements as well as drop trajectory calculations where the gas velocity field was based on LHF predictions.…”

Section: Nomenclaturesupporting

confidence: 60%

“…2 This approach yielded reasonably good agreement with flow visualization measurements of Birk and Reeves 4 for combusting LGP 1845. 2 However, later evaluation in this laboratory suggested significant separated-flow effects using similar measurements as well as drop trajectory calculations where the gas velocity field was based on LHF predictions. 3 Thus, the need for a separatedflow treatment of these sprays has been established although full separated-flow models of monopropellant sprays, allowing for effects of drop motion on the flow, have not been reported.…”

Section: Nomenclaturesupporting

confidence: 60%

“…1 /mi. 2 Thus the flow largely involves two states, unreacted liquid at its injection temperature, and completely reacted gaseous combustion products, if the ambient state also consists of products of adiabatic combustion. Since drop combustion properties were not strongly influenced by ambient temperatures, 3 the ambient state was taken to be conditions after adiabatic combustion.…”

Section: Gas-phase Formulationmentioning

confidence: 99%

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Structure and mixing properties of combusting monopropellant sprays

Lee

Faeth

1992

Journal of Propulsion and Power

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The spray combustion properties of a hydroxylammonium nitrate (HAN)-based monopropellant (LGP 1845) were studied both theoretically and experimentally. Drop size, liquid mass flow rate, and liquid mass flux distributions were measured for pressure-atomized sprays in the atomization breakup regime, burning within a combustion gas environment at pressures of 4.5-5.0 MPa. Two separated-flow models were evaluated using the new measurements: a deterministic separated-flow model where drop-turbulence interactions were ignored, and a stochastic separated-flow model where drop-turbulence interactions were considered using random-walk computations for drop motion. When based on burning rates found from earlier single-drop experiments, both models were in reasonably good agreement with the measurements. Separated-flow effects are quite important for these sprays, with the length of the liquid-containing region being relatively independent of injector diameter and extending roughly 300 mm from the injector exit for injector exit velocities of roughly 70 m/s and injector diameters of 0.3 and 0.6 mm.

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Section: Nomenclaturesupporting

confidence: 60%

Section: Nomenclaturesupporting

confidence: 60%

Section: Gas-phase Formulationmentioning

confidence: 99%

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Structure and mixing properties of combusting monopropellant sprays

Lee

Faeth

1992

Journal of Propulsion and Power

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“…The measurements were used to assess the importance of separated-flow phenomena within pressure-atomized combusting monopropellant sprays, i.e., effects of finite velocities and transport rates between the phases. Similar to our earlier work, 1 ' 3 the investigation was limited to a hydroxyl-ammonium nitrate (HAN)-based monopropellant (LGP 1845) which is of interest for several highpressure monopropellant combustion systems. Individual drop-burning rates are needed to help understand the properties of combusting monopropellant sprays.…”

Section: The Drop and Spray Combustion Properties Of The Hydroxyl-ammmentioning

confidence: 93%

Separated-flow considerations for pressure-atomized combusting monopropellant sprays

Lee¹,

Tseng²,

Faeth³

1989

27th Aerospace Sciences Meeting

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“…Combustion of monopropellant sprays, governed by multiphase premixed combustion, is dissimilar to diffusion-dominated hydrocarbon spray combustion. Several studies have been conducted in the past on spray combustion of hydroxyl ammonium nitrate (HAN) [14][15][16][17] . However, a thorough study of the combustion characteristics of glow-plug-assisted or sparkassisted nitroalkane combustion was not found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Ignition and Combustion of Isopropyl Nitrate Sprays

Ambekar

Bhangale

Dukale

et al. 2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Experimental investigation of spray combustion of the monopropellant nitromethane (NM) assisted by a hot surface is presented. Spray combustion of NM was studied in a constant volume combustion chamber fitted with glow plugs within the chamber pressure range of 1 to 5 bar. The sprays were produced by injecting approximately 0.1 ml of the propellant through a commercial gasoline injector. Ignition was achieved by using two glow plugs placed in a horizontally opposed manner at a distance of 70 mm from the nozzle tip within the chamber. The pressure rise within the chamber was used to elucidate the ignition and combustion processes. The ignition delays were found to be in the order of milliseconds, with high heat release rates accompanying the combustion phenomena. The maximum differential pressures reached during combustion were found to increase with chamber pressure up to 3 bar, and decrease thereafter. The rate of pressure rise achieved after combustion were also found to be dependent on the initial chamber pressures. FTIR spectrometry of the combustion products yielded further insight into the reactions.

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Analysis of Combusting High-Pressure Monopropellant Sprays

Cited by 12 publications

References 4 publications

Structure and mixing properties of combusting monopropellant sprays

Structure and mixing properties of combusting monopropellant sprays

Separated-flow considerations for pressure-atomized combusting monopropellant sprays

Ignition and Combustion of Isopropyl Nitrate Sprays

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