Traveling Spark Igniter Pulsing for Coherent Low-Pressure Plasma
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Solution Overview
Problem
Existing plasma generation techniques developed for high-pressure environments are not suitable for low-pressure environments, leading to uncontrolled energy dispersion and excessive thermal wear on components, resulting in substandard performance and short component life.
Innovation Solution
Applying a breakdown voltage followed by a follow-on current with controlled pulse duration, peak current, and energy levels to maintain plasma coherence and directionally propagate plasma while limiting thermal expansion and material state alteration of electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure environment plasma generation techniques are applied in low-pressure environments, then plasma can be generated, but energy disperses uncontrolled and components experience excessive thermal wear
Solution Approach 1:
The patent applies periodic pulsed current instead of continuous current to generate plasma. The pulsed nature allows the plasma to be generated in controlled bursts, maintaining coherence during each pulse while allowing dissipation between pulses, thus preventing uncontrolled energy dispersion and reducing thermal accumulation on components.
Solution Approach 2:
The patent dynamically adjusts current parameters (amplitude, pulse width, frequency) based on operating conditions to maintain plasma coherence. By making the current characteristics variable rather than fixed, the system can adapt to low-pressure conditions while controlling energy distribution and thermal effects on components.
2Stability of the object's composition
If high current is applied to maintain plasma coherence, then plasma effectiveness is improved, but thermal expansion of electrodes increases
Solution Approach 1:
By using pulsed current rather than continuous current, the patent maintains high current amplitude during each pulse to sustain plasma coherence, while the intermittent nature of the pulses allows cooling periods that prevent excessive thermal accumulation and expansion of the electrodes.
Solution Approach 2:
The patent applies pre-breakdown conditioning pulses before the main plasma-generating current. These preliminary pulses prepare the medium for breakdown at lower subsequent current levels, reducing the peak current required to maintain plasma coherence and thereby reducing thermal effects on electrodes.
3Stability of the object's composition
If plasma is kept stationary to maintain coherence, then plasma effectiveness is maintained, but energy transfers back to solid structures
Solution Approach 1:
The patent introduces controlled motion to the plasma through time-varying current waveforms that create electromagnetic forces moving the plasma away from the electrode surfaces. This dynamic approach maintains plasma coherence through controlled movement rather than static positioning, directing energy away from solid structures and reducing harmful thermal transfer.
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
Maintains plasma coherence and extends the useful life of components by balancing Lorentz force with thermal expansion, achieving high performance in low-pressure environments.
Implementation Method 1
applying, to at least two electrodes, a breakdown voltage sufficient to induce breakdown between the at least two electrodes, resulting in formation of plasma
Implementation Method 2
a follow-on current having a peak current that exceeds 450 amperes (A) at a time at least two microseconds following breakdown
Data Source
AI summary
The present disclosure provides plasma generation techniques that may be implemented to maintain plasma coherence, resulting in high performance and long useful life of components, and which are suitable for use in a low-pressure environment (e.g., as in some aerospace applications) but are not limited thereto. In some embodiments, plasma generation and coherence maintaining techniques may be implemented to improve construction and/or operation of a traveling spark igniter that is configured to generate and propagate plasma using a Lorentz force and thermal force.