Aeroshell Electrode Layout for MHD Lift Augmentation in Entry
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Solution Overview
Problem
Current spacecraft designs face challenges in generating sufficient lift during atmospheric entry, particularly for destinations like Neptune, where traditional blunt body aeroshells provide inadequate Lift-to-Drag ratios, and existing thermal protection systems are insufficient for extreme heat conditions.
Innovation Solution
The implementation of a magnetohydrodynamic (MHD) flow control system, which includes a pair of electrodes embedded in the aeroshell and a magnet placed on an inward-facing surface, creates Lorentz forces that augment lift and drag, allowing for more efficient guidance, navigation, and control of the spacecraft while providing additional thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blunt body aeroshell shape is used for thermal protection, then thermal protection is improved, but lift generation deteriorates (L/D ratio around 0.2)
Solution Approach 1:
The patent changes the physical state of the atmospheric gas from neutral to ionized plasma through magnetic field interaction, enabling MHD force generation. This parameter change allows the blunt body aeroshell to generate additional lift forces (Lorentz forces) without altering its thermal protection geometry, resolving the contradiction between thermal protection and lift generation.
Solution Approach 2:
The patent replaces purely aerodynamic lift generation with magnetohydrodynamic force generation. By introducing magnetic fields that interact with ionized atmospheric particles, the system generates Lorentz forces that augment lift without requiring changes to the blunt body aeroshell geometry, thus maintaining thermal protection while improving lift capability.
2Force
If a Mid L/D shape is used to increase lift, then lift generation is improved, but thermal protection system complexity and manufacturing difficulty worsen
Solution Approach 1:
The patent substitutes aerodynamic shape modification with MHD force generation. Instead of manufacturing complex Mid L/D shapes that challenge current TPS manufacturing capabilities, the system uses magnetic fields to generate the required lift forces on simpler blunt body geometries, significantly easing manufacturing requirements.
Solution Approach 2:
The blunt body aeroshell serves multiple functions: it provides thermal protection through its simple geometry while simultaneously serving as the platform for MHD force generation. The same structure that protects from heat also hosts the magnetic field interaction system, eliminating the need for separate complex lifting structures.
3Force
If magnetic fields are used for flow control and lift augmentation, then lift generation is improved, but device complexity worsens
Solution Approach 1:
The MHD system utilizes the naturally occurring ionized plasma in the atmospheric entry flow field as the working medium. The atmospheric gas itself, ionized by the intense heating during entry, serves as the conductive fluid that interacts with the magnetic fields. This eliminates the need for separate plasma generation systems, reducing overall device complexity.
Solution Approach 2:
The patent merges the thermal protection function with the lift generation function by placing magnetic field sources on or near the blunt body aeroshell surface. The same structure that provides thermal protection also serves as the platform for MHD force generation, combining multiple functions into a single integrated system.
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 MHD approach enables the use of blunt bodies and other aeroshell shapes to meet stringent entry parameters, significantly improving lift generation and thermal protection, thus enhancing the feasibility of missions to challenging destinations like Neptune.
Implementation Method 1
creates Lorentz forces that augment lift and drag
Implementation Method 2
magnetohydrodynamic (MHD) flow control system
Implementation Method 3
electron number densities observed in aerothermal analysis results for Mars entries were similar orders of magnitude as those required for MHD power generation practices on Earth
Data Source
AI summary
A magnetohydrodynamic (MHD) flow control mechanism is described which substantially improves the existing processes in that smaller magnetic fields, requiring far less mass, may be placed away from the forebody of the spacecraft to produce Lorentz forces that augment the lift and the drag forces for guidance, navigation, and control of the spacecraft. The MHD flow control mechanism may also be configured to provide additional thermal protection of the electrodes therein.