Aircraft Leading Edge Plenum Zoning for Lower Blowing Pressure
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Solution Overview
Problem
In hybrid laminar flow control systems, the high external pressure at the leading edge of aircraft surfaces requires elevated plenum pressure for air blowing, which increases weight, space requirements, and aerodynamic drag, especially since pressure is maximum at the leading edge point.
Innovation Solution
The plenum is divided by a partition wall into a leading edge section and a downstream section, allowing for lower pressure in the side portions, enabling separate air inlet and duct designs optimized for each section, reducing overall pressure requirements and minimizing weight and drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plenum pressure is increased to overcome the high external pressure at the leading edge point, then air blowing performance is improved, but weight, space requirements, and aerodynamic drag increase
Solution Approach 1:
The plenum is divided into multiple pressure zones by partition walls, with each zone maintaining different pressure levels appropriate to its location. The leading edge point zone maintains high pressure for effective air blowing, while side portions operate at lower pressures, reducing overall system weight and drag while maintaining local performance requirements.
Solution Approach 2:
Different pressure levels are applied to different spatial locations within the plenum based on local external pressure conditions. The leading edge point area receives high pressure to overcome maximum external pressure, while side portions receive reduced pressure matching their lower external pressure environment, optimizing performance and reducing system requirements.
2Reliability
If the plenum pressure is increased to overcome the high external pressure at the leading edge point, then air blowing performance is improved, but space requirements increase
Solution Approach 1:
The plenum is segmented into pressure zones separated by partition walls, allowing each zone to be sized appropriately for its specific pressure requirements. This reduces the total volume of high-pressure plenum space needed while maintaining effective air blowing performance at the leading edge point.
3Reliability
If the plenum pressure is increased to overcome the high external pressure at the leading edge point, then air blowing performance is improved, but aerodynamic drag increases
Solution Approach 1:
High plenum pressure is applied only in the leading edge point zone where it is necessary to overcome maximum external pressure, while side portions operate at lower pressures. This localized pressure distribution reduces aerodynamic drag associated with high-pressure regions while maintaining effective air blowing performance where needed.
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 approach reduces the plenum pressure needed for air blowing in side portions, allowing for lighter, more efficient designs with reduced aerodynamic drag and optimized mass flow rates, enhancing the performance of the leading edge structure.
Implementation Method 1
the plenum is separated by a partition wall into a leading edge plenum section in the area of the leading edge point, and a downstream plenum section downstream from the leading edge plenum section... the pressure in the leading edge plenum section does not affect the pressure in the downstream plenum section
Implementation Method 2
The leading edge panel comprises a plurality of micro pores, such as perforations, forming a fluid connection between the plenum and the ambient flow moving over an outer surface
Data Source
AI summary
A leading edge structure (11) for a flow control system of an aircraft (1) including a leading edge panel (13) surrounding surrounds a plenum (17) which extends in a span direction (19), wherein the leading edge panel (13) has a first side portion (21) extending from a leading edge point (23) to a first attachment end (25), wherein the leading edge panel (13) has a second side portion (27) opposite the first side portion (21), extending from the leading edge point (23) to a second attachment end (29), wherein the leading edge panel (13) comprises an inner surface (33) facing the plenum (17) and an outer surface (37) in contact with an ambient flow (39), and wherein the leading edge panel (13) comprises a plurality of micro pores (45) forming a fluid connection between the plenum (17) and the ambient flow (39).