Growth of Rayleigh instability in a Hall thruster channel having dust in exit region

Malik, Hitendra K.; Tyagi, Jasvendra; Sharma, Dinkar

doi:10.1063/1.5050688

Cited by 16 publications

(3 citation statements)

References 48 publications

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“…Hall-effect thrusters are becoming very popular for space flight (especially satellites) due to their large specific impulse. In these thrusters, the wall at the thruster exit has been shown to erode due to the instability and therefore a better understanding is necessary [13]. We also see RTI in salt domes.…”

Section: Applicationsmentioning

confidence: 85%

Fluid Instabilities and Transition to Turbulence

Roberts¹

2021

Computational Overview of Fluid Structure Interaction

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Fluid instabilities show up in many places in everyday life, nature and engineering applications. An often seemingly stable system with a gradient will often give rise to the development of instability, which can cascade eventually into turbulence. Governed by the parameters of the flow and fluids, when exposed to perturbation in the system, some wavelengths will grow, while others will not. This selectivity of specific structure sizes can be determined by using linear stability theory and then accounting for viscosity. Once these unstable wavelengths have grown to a substantial degree, the system typically becomes nonlinear before turbulence eventually sets in. Initially, looking at buoyancy-driven instabilities, one can clearly see how certain wavelengths can be selected. This can be extended to shear-driven instabilities and to geophysical systems. For some flows, simplifications can be made to analyze the specific fluid structures, while for others, only broad conclusions can be drawn about the stability criteria. With parallel shear flows (like that over wings and through pipes), the applications are more obvious, but the equations more difficult. However, conclusions can be drawn as to how one can control, prevent and initiate instability to suit our engineering needs.

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Section: Applicationsmentioning

confidence: 85%

Fluid Instabilities and Transition to Turbulence

Roberts¹

2021

Computational Overview of Fluid Structure Interaction

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“…The increase in discharge chamber volume may decrease the ion density or increase the plume divergence sufficiently to reduce thrust [37]. Sputtered wall material can also coat the anode and enter the plume, which may impact discharge electrical characteristics [72][73][74]. Shagaida et al [19] proposed that erosion can lead to an increased proportion of non-propellant neutral particles in the discharge chamber and that this decreases thruster performance by lowering propellant utilization efficiency.…”

Section: Thruster Testsmentioning

confidence: 99%

Review of Plasma-Induced Hall Thruster Erosion

Brown

Walker

2020

Applied Sciences

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The Hall thruster is a high-efficiency spacecraft propulsion device that utilizes plasma to generate thrust. The most common variant of the Hall thruster is the stationary plasma thruster (SPT). Erosion of the SPT discharge chamber wall by plasma sputtering degrades thruster performance and ultimately ends thruster life. Many efforts over the past few decades have endeavored to understand wall erosion so that novel thrusters can be designed to operate for the thousands of hours required by many missions. However, due to the challenges presented by the plasma and material physics associated with erosion, a complete understanding has thus far eluded researchers. Sputtering rates are not well quantified, erosion features remain unexplained, and computational models are not yet predictive. This article reviews the physics of plasma-induced SPT erosion, highlights important experimental findings, provides an overview of modeling efforts, and discusses erosion mitigation strategies.

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“…M AGNETIC field has numerous applications ranging from space electric propulsion [1], [2], spectroscopy [3], wastewater treatment [4], [5], medical sector [6], [7] to the enhancement of production of ozone from air [8]. Apart from these applications, magnetic field has played a role in electrostatic and electromagnetic instabilities in Hall Thrusters [9] and reflection of nonlinear structure in warm plasma [10].…”

Section: Introductionmentioning

confidence: 99%

A Three-Coil Setup for Controlled Divergence in Magnetic Nozzle

Malik

Kumar

Singh

2021

IEEE Trans. Plasma Sci.

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Magnetic nozzles with their contactless feature have opened new grounds for long-distance space travels. For quicker mission completions along with improving system reliability, it becomes necessary to design robust systems that exhibit the ability to confine thrust. A semianalytical numerical method is proposed for rapid and assumption-less calculations of the magnetic field because of a thick coil with rectangular cross section. The method is extended for the proposal of a three-coil setup, where divergence angle of the magnetic field lines is readily controlled in-flight to provide the flexibility to modify the output magnetic thrust and the nozzle's efficiency.

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Growth of Rayleigh instability in a Hall thruster channel having dust in exit region

Cited by 16 publications

References 48 publications

Fluid Instabilities and Transition to Turbulence

Fluid Instabilities and Transition to Turbulence

Review of Plasma-Induced Hall Thruster Erosion

A Three-Coil Setup for Controlled Divergence in Magnetic Nozzle

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