Kinetic Modeling of Hypergolic Propellants Using Impinging Element Injectors

Sardeshmukh, Swanand V.; Heister, S. D.; Xia, Guoping; Merkle, Charles L.; Sankaran, Venkateswaran

doi:10.2514/6.2012-3760

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…The current work provides a companion numerical investigation of the ignition and combustion characteristics of the experimental set-up. As indicated in Sardeshmukh et al [5], the major heat release occurs in the gas phase reactions during the hypergolic ignition process. Thus, as a first step, the present work is concerned with the propellants MMH and RFNA in the gas-phase.…”

Section: Numerical Simulation Of Combustion Of Unlike Impinging Jets mentioning

confidence: 96%

“…Employing such detailed mechanism for computing reacting flow solution is however impractical and reduced mechanisms that are able to retain favorable aspects of the detailed mechanism are necessary. One such mechanism due to Labbe et al is RChem1, studied in detail by Sardehsmukh et al [5].…”

Section: Modeling Approachmentioning

confidence: 98%

“…These characteristics, in addition to the manageable cost of computations due to smallest number of species and elementary reactions for these set of propellants make RChem1 a very attractive choice for simulating reacting flow of these propellants. Further details of the reaction rate calculations and the chemical mechanisms can be found in Sardeshmukh et al [5,7]. figure 3(a) is placed at the same location as in the experimental geometry being studied at Purdue University.…”

Section: Modeling Approachmentioning

confidence: 99%

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Numerical Simulation of Combustion of Unlike Impinging Jets Near a Wall

Park

Sardeshmukh

Heister

et al. 2013

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

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Approved for public release; distribution is unlimited.The combustion of gas-gas hypergolic propellants with MMH (Monomethylhydrazine) as fuel and RFNA (Red fuming nitric acid) as oxidizer are studied numerically for unlike impinging jets near an inclined wall using a detailed chemical reaction mechanism. The current study focuses on quantifying the effect of the inclined wall on the ignition characteristics: namely, contact time/location and ignition delay/location. Furthermore, the effect of wall is assessed with respect to mixing and flame spreading. The baseline threedimensional simulation results compare two domains, with and without the inclined wall, under the same inlet flow conditions. These results show that the space between the wall surface and injector tips acts as a mixing zone with intensified vorticity and heat release rate. Two-dimensional results for various injection velocities are also presented and are compared with the three-dimensional results.

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Section: Numerical Simulation Of Combustion Of Unlike Impinging Jets mentioning

confidence: 96%

Section: Modeling Approachmentioning

confidence: 98%

Section: Modeling Approachmentioning

confidence: 99%

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Numerical Simulation of Combustion of Unlike Impinging Jets Near a Wall

Park

Sardeshmukh

Heister

et al. 2013

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

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Numerical Investigation of Hypergolic Combustion Characteristics in Rocket Engines

Das

Sinha

et al. 2019

Innovations in Sustainable Energy and Cleaner Environment

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Experimental Study of Impingement and Reaction of Hypergolic Droplets

Forness

Pourpoint

Heister

2013

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

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Understanding hypergolic ignition is critical for the safe and successful operation of hypergolic engines. Presently, hypergolic ignition models do not capture the complex coupling of physical and chemical processes necessary to achieve ignition and rely on experimental results for validation. In some cases, the chemical kinetics of hypergolic propellants and the fluid dynamics of droplet collisions couple to produce unexpected phenomena. This research investigates contact between droplets and pools of liquid hypergolic propellants under various impact velocities and impact geometries in order to quantify the liquid-phase reactions and categorize the resulting interaction. A total 142 drop test experiments were performed. Three distinct types of impacts were identified: explosions, bounces, and splashes. The impact type was found to depend on the impact Weber number and impact angle. Splashes occurred above a critical Weber number of 250, regardless of impact angle. Explosions occurred for Weber numbers less than 250, and for impact angles less than seven degrees. If the impact angle was greater than seven degrees, the test resulted in a bounce. High-speed videos acquired at up to 100,000 frames per second provided a means to observe the liquid-phase chemical reactions in detail. From these videos, the delay between contact and first gas production was measured to be between 20 and 200 microseconds for monomethylhydrazine and red fuming nitric acid. This delay provides insight into the rates of the liquid-phase chemical reactions, and has helped calibrate liquid-based ignition models. Nomenclature k = rate constant of a chemical reaction A = Arrhenius pre-exponential factor E a = activation energy R = ideal gas constant T = temperature m,n = reaction partial order exponents

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Kinetic Modeling of Hypergolic Propellants Using Impinging Element Injectors

Cited by 4 publications

References 28 publications

Numerical Simulation of Combustion of Unlike Impinging Jets Near a Wall

Numerical Simulation of Combustion of Unlike Impinging Jets Near a Wall

Numerical Investigation of Hypergolic Combustion Characteristics in Rocket Engines

Experimental Study of Impingement and Reaction of Hypergolic Droplets

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