Autonomous Spoiler Deployment for Turbulent Transition Control
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Solution Overview
Problem
Vehicles face significant resistance due to vortex shedding at the bottom, primarily caused by low surface layer energy failing to resist adverse pressure gradients, leading to flow separation and increased pressure drag, which existing solutions struggle to address without generating additional resistance.
Innovation Solution
A spoiler apparatus with a groove and elastic member is designed to autonomously trigger turbulence transition by generating a circumferential disturbance, featuring a sickle-shaped spoiler with dovetail grooves and side-edge saw teeth, which can be automatically deployed or retracted based on flow conditions to minimize additional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a spoiler is deployed to trigger turbulence transition, then vortex shedding is eliminated, but structural complexity increases
Solution Approach 1:
The spoiler is divided into multiple segments including a groove, a rotatable spoiler element, and an elastic member. This segmentation allows each component to perform its specific function independently while simplifying the overall structure and enabling easy installation and maintenance
Solution Approach 2:
The spoiler employs a simple rotational mechanism about a swing shaft rather than complex actuation systems. The elastic member provides automatic deployment and retraction based on flow conditions, significantly reducing structural complexity while maintaining effective turbulence transition capability
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
The apparatus effectively reduces resistance by autonomously transitioning the flow from laminar to turbulent, eliminating vortex shedding and minimizing additional frictional resistance, while allowing for adjustable operation across various navigating states and environments.
Implementation Method 1
another end of the spoiler is connected to a bottom of the groove via the elastic member and is rotatable about the swing shaft, and an outward pushing force on the spoiler generated by the elastic member in a maximally compressed state is balanced with a pressure in a critical state of flow
Data Source
AI summary
A spoiling apparatus for triggering a turbulent transition by autonomous disturbance and spoilers. The spoilers are mounted in multiple grooves in the circumferential direction of a navigating body, when a flow autonomously undergoes a turbulent transition, the spoilers remain in the grooves, the surface of the navigating body is free of protrusion, thus causing no additional flow resistance. A rated critical Reynolds number is set, in a case of a reduced flow speed and reduced density, the flow is a laminar flow, at which time the pressure applied to the spoilers by the flow is reduced, and the spoilers are ejected under the effect of compression springs. When ejected, the spoilers disturb the flowing of the bottom layer of the flow, and trigger the laminar flow into a turbulent flow. By setting the rebounding force of the compression springs, the spoiling apparatus is turned on automatically when a disturbance-triggered turbulent transition is required and is turned off when not required, thus implementing the autonomous control of turbulent transitions.