Modeling and Characterization of Electrospray Propellant-Surface Interactions

Cidoncha, Ximo Gallud; Lozano, Paulo; Bendimerad, Rafid; Petro, Elaine; Hampl, Sebastian K.

doi:10.1109/aero53065.2022.9843583

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…The N-body simulation results presented in this work were generated using the same procedure as developed in Petro et al [5,10,11]. Particles are injected into the simulation according to initial conditions of emission current density as given by electrohydrodynamic (EHD) solutions for meniscus shapes from models developed by Coffman [18] and Gallud-Cidoncha [19,20].…”

Section: E N-body Full Beam Simulationmentioning

confidence: 99%

“…Fragmentation of larger ion clusters after emission is often observed in pure ion mode electrospray thrusters and is known to further reduce propulsive efficiency [1,2]. Additionally, the low energy ions and neutral clusters resulting from fragmentation events can leave ionic liquid deposits on the extractor, degrading the hardware and leading to electrical shorts that dramatically reduce emitter lifetime [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…To address this gap in understanding of electrospray emission, we present an experimental characterization of species angular distribution for a single emitter using the liquid EMI-BF 4 with different applied voltages. Using the same simulation framework as recent N-body simulations [5,11], we investigate trajectories of single clusters in realistic emitter electric and potential fields to determine the effect of fragmentation on cluster trajectories. We also present preliminary results of N-body simulations of angular beam composition for comparison to experimental results, and discuss how these simulations could be used in future work to reduce uncertainty in knowledge of the initial conditions of ion clusters after emission.…”

Section: Introductionmentioning

confidence: 99%

“…These neutrals have low energy because they fragment before the majority of the acceleration has occurred. This makes them particularly harmful to electrospray applications because they are likely to impact emitter hardware and with low energy are more likely to deposit on the hardware surface [5].…”

mentioning

confidence: 99%

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Angular Properties of Ionic Liquid Electrospray Emitters

Schroeder

Cidoncha

Bruno

et al. 2023

AIAA SCITECH 2023 Forum

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The angular distribution of emitted species in electrospray ion beams is not well characterized and can have negative effects on propulsive performance and emitter lifetime. We present an experimental characterization of the angular distribution of emitted species in a single electrospray ion beam as a function of firing voltage using time of flight mass spectrometry. Angular current distributions indicate the central axis of emission varies up to 10 • from the central axis of the emitter tip. Variation in the ion species as a function of angle depends on the firing voltage. Simulations of single particle trajectories indicate that fragmentation of ion clusters results in ion products moving closer to the center of the beam and neutral products spreading up to 47 • depending on how rapid fragmentation occurs. Experimental results are compared to multiscale full-beam simulations of electrospray emission and future use of these simulations to explain angular beam behavior is discussed.

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Section: E N-body Full Beam Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Angular Properties of Ionic Liquid Electrospray Emitters

Schroeder

Cidoncha

Bruno

et al. 2023

AIAA SCITECH 2023 Forum

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Comparison of computational algorithms for simulating an electrospray plume with a n-body approach

et al. 2022

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In order to better evaluate the trade-offs between different simulation options for an electrospray thruster plume, we have developed a multi-scale n-body code to compute the evolution of a single emitter electrospray plume in the pure ionic regime. The electrostatic force computations in the simulation are captured through the use of three different computational algorithms with various degrees of approximation. The results of the simulations for a simple test case are compared in terms of computational speed and accuracy. The test case utilizes a single operating point (323nA) for a stable meniscus solution for the ionic liquid EMI-BF4 firing in the positive pure ion mode. Complex species and probabilistic fragmentation processes are neglected. An overview is provided of the trade-off between accuracy and computational speed for the three algorithms in the context of simulating the electrostatic interactions between particles. For a large number of particles, the faster algorithms show a significant reduction in computational time while maintaining a high level of accuracy with a proper choice of tuning parameters.

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