Jet Engine Aft Section Radar Wave Redirection
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Solution Overview
Problem
Current stealth technologies are inadequate in addressing radar waves reflected from the rear and interior of a jet engine, particularly those coming straight from behind, which poses a significant threat to aircraft requiring stealth capabilities.
Innovation Solution
The aft section structure of a jet engine incorporates a cone, guide vanes, spray bars, and flame holders with angled surfaces to redirect radar waves away from their original reflection path, utilizing a combination of conical and airfoil shapes to minimize rearward reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional stealth technologies are used to protect against radar waves from the front and side, then protection against front and side radar detection is improved, but protection against rearward radar waves reflected from the engine interior is insufficient
Solution Approach 1:
The engine aft section is divided into multiple functional segments: a conical section with specific angle range (15-45 degrees) to redirect rearward radar waves, guide vanes with pressure sides at specific angles (10-30 degrees) to further deflect waves, and spray bars with trailing sides at specific angles (5-20 degrees) for additional wave redirection. Each segment targets radar waves from specific directions with optimized angular geometry.
Solution Approach 2:
Different portions of the engine aft section are given different geometric properties tailored to their specific function: the conical section has a specific taper angle for rearward wave redirection, guide vanes have pressure sides at optimized angles for lateral deflection, and spray bars have trailing sides at specific angles for fine-tuned wave scattering. Each local geometry is optimized for its specific radar wave redirection task.
2Object-affected harmful factors
If the engine aft section structure is modified to reduce radar wave reflection, then stealth capability is improved, but the structural complexity increases
Solution Approach 1:
The engine aft section components serve dual functions: the conical section and guide vanes redirect radar waves for stealth purposes while simultaneously serving as structural elements for engine exhaust flow management. The spray bars and flame holders also serve both aerodynamic flow control functions and radar wave redirection functions, reducing the need for separate dedicated stealth components.
Solution Approach 2:
The conical section with its curved tapered surface (15-45 degree angle) provides smooth radar wave redirection without sharp edges that would create strong reflections. The curved surfaces of the guide vanes and spray bars similarly provide gradual wave deflection, reducing structural complexity compared to flat-panel configurations while maintaining effective radar wave scattering.
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 configuration effectively reduces the intensity of radar waves reflected back towards the source, enhancing the stealth capabilities of aircraft by diverting reflected waves away from the direction of incidence, thereby mitigating the threat from rearward radar detection.
Implementation Method 1
The disclosure herein relates to a structure for an aft section of a jet engine, and in particular to an aft section structure which suppresses reflection of a radar wave
Data Source
AI summary
An aft section structure of a jet engine with an axis is comprised of a casing defining a duct around the axis and opened axially fore and aft; a cone tapering aftward at a first angle with the axis and having a pointed end; guide vanes, each of the vanes radially extending from the cone to the casing and comprising a pressure side at a second angle with a plane containing the axis; spray bars, each of the spray bars extending radially within the duct and comprising trailing sides, each of the trailing sides being directed aftward at a third angle with a plane containing the axis; and flame holders, each of the flame holders extending radially within the duct and comprising one or more interior sides, each of the interior sides being directed aftward at a fourth angle with a plane containing the axis.