Flexible Drag Reduction Attachment for Adaptive Flow Conditions
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Solution Overview
Problem
Existing drag reduction methods require modifying the shape of solid objects, which is costly, limited by internal functional requirements, and not adaptable to varying flow field conditions, as they cannot change shape once manufactured.
Innovation Solution
A drag reduction device comprising a flexible first part attached to a body via a second part, allowing the first part to change shape under fluid interaction, thereby reducing drag without altering the body's shape and adapting to different flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shape of a solid object is modified to reduce drag, then drag reduction is achieved, but the cost increases and internal functional requirements are limited
Solution Approach 1:
The drag reduction system is segmented into a separate detachable device rather than being integrated into the solid object itself. The device includes a flexible membrane structure that can be independently manufactured and attached to the object, allowing drag reduction functionality to be separated from the main object's manufacturing process.
Solution Approach 2:
A flexible membrane acts as an intermediary between the solid object and the fluid flow. This membrane can deform in response to flow conditions to reduce drag, while the solid object itself remains unchanged and can be manufactured independently without considering drag reduction requirements.
2Object-affected harmful factors
If the shape of a solid object is modified to reduce drag, then drag reduction is achieved, but adaptability to varying flow field conditions deteriorates
Solution Approach 1:
The drag reduction device incorporates a flexible membrane that can dynamically change its shape in response to varying flow field conditions. Unlike fixed geometric modifications, this membrane can adapt its configuration real-time to optimize drag reduction across different flow regimes, speeds, and environmental conditions.
Solution Approach 2:
The system changes physical parameters (membrane shape, surface area, flexibility) in response to flow field conditions rather than relying on fixed geometric parameters. This allows the same device to provide effective drag reduction across a wide range of operating conditions by adjusting its physical state.
3Object-affected harmful factors
If geometric modification of a solid is used for drag reduction, then drag reduction is achieved, but energy consumption increases
Solution Approach 1:
The flexible membrane is designed to automatically respond to flow field conditions without requiring external energy input or control systems. The membrane's elasticity and fluid-structure interaction enable it to self-adjust its shape in response to varying flow conditions, eliminating the need for powered actuators or control mechanisms.
4Object-affected harmful factors
If the shape of a solid object is modified to reduce drag, then drag reduction is achieved, but the complexity of the device increases
Solution Approach 1:
The drag reduction functionality is achieved using a simple flexible membrane or thin film structure rather than complex mechanical systems. This flexible shell can deform passively in response to flow conditions, providing drag reduction through its flexibility alone without requiring complex mechanisms, actuators, or control systems.
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 device provides effective drag reduction with minimal weight and cost, allowing for easy assembly and disassembly, and can adapt to varying flow field conditions without energy consumption, achieving up to 10% drag reduction.
Implementation Method 1
the first part is made of a flexible material and configured to be able to change its shape under the action of a flow field
Data Source
AI summary
A drag reduction device includes a first part and a second part. The first part is attached to the second part, and the second part is detachably attached to a body. The first part is made of a flexible material and configured to be able to change its shape under the action of a flow field. According to this application, through providing the drag reduction device on the body in need of drag reduction by detachably attaching the drag reduction device to the body, the need to modify the shape of the body itself is dispensed with. According to this application, the drag reduction device is very simple in structure and easy to assemble and disassemble, almost does not add weight to the body and has very low cost. According to this application, the drag reduction device is able to change its shape without consuming energy at all. Moreover, under different flow field conditions, it can assume different shapes that adapt it to the flow field conditions.