Downstream Plenum Propellant Distributor for Hall Thruster
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Solution Overview
Problem
Conventional Hall thruster propellant distributors face issues with non-uniform propellant flow, complexity in assembly, and vulnerability to debris due to the placement of orifices close to the plasma region, leading to potential clogging and damage.
Innovation Solution
A propellant distributor design with a downstream plenum chamber and outlets located upstream in the thruster discharge channel, which increases the propellant mixing path and shields outlets from debris, ensuring azimuthally uniform and radially balanced flow by placing the plenum chamber downstream, allowing propellant to exit along the discharge channel walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If orifices are placed closer to the plasma region to distribute propellant, then propellant distribution efficiency is improved, but the orifices become more vulnerable to clogging and damage from external debris
Solution Approach 1:
The patent inverts the conventional arrangement by placing the plenum chamber downstream instead of upstream. This reversal positions the outlets away from the plasma region, reducing their exposure to debris while maintaining effective propellant distribution through the inverted flow path architecture.
Solution Approach 2:
The patent introduces a downstream plenum chamber as an intermediary component between the propellant source and the discharge channel. This intermediary structure allows propellant to be distributed through walls rather than direct orifices near the plasma, shielding the distribution mechanism from debris while maintaining functionality.
2Ease of manufacture
If conventional propellant distributors are used with upstream plenum chambers, then assembly is simpler, but propellant flow uniformity in the ionization zone is insufficient
Solution Approach 1:
By inverting the plenum chamber position to downstream, the patent achieves better propellant flow uniformity as the propellant distributes through the channel walls along the discharge path, ensuring more consistent neutral flux density in the ionization zone while maintaining a relatively simple single-piece assembly structure.
3Adaptability or versatility
If multiple parts are used in conventional propellant distributors, then design flexibility is improved, but assembly complexity increases
Solution Approach 1:
The patent merges multiple components (plenum chamber, outlets, and distributor structure) into a single integrated propellant distributor component. This consolidation eliminates the need for separate assembly of multiple parts while maintaining the functional flexibility of having both plenum chamber and outlet features, thereby reducing assembly complexity without sacrificing design adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances propellant flow uniformity and protects the outlets from debris, achieving improved azimuthal and radial balance, reducing the risk of clogging and damage, while simplifying the assembly process.
Implementation Method 1
The at least one plenum chamber is downstream from the plurality of outlets in the discharge channel
Data Source
AI summary
A propellant distributor or anode includes a plenum chamber and a plurality of outlets. The at least one plenum chamber is configured to receive a flow of propellant from an inlet, and the plurality of outlets are configured to distribute the flow of propellant into an inner channel wall and an outer channel wall of a discharge channel.