Stator Suction Appliance Diverts Leakage Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Continuous-flow machines with adjustable guide vanes in aircraft engines suffer from inefficiency due to leakage flows that reduce the main flow velocity and increase specific fuel consumption, as working fluid is undesirably redirected from the pressure side to the suction side of the blade leaf.
Innovation Solution
A stator device with a suction appliance that creates a lower static pressure area to divert and extract leakage flows away from the main flow, reducing their interaction with the main flow and improving efficiency by branching off part of the mass flow from the pressure side, thereby minimizing the negative impact on the main flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide vanes are arranged with platforms forming an annular channel, then the structural integrity and flow guidance are improved, but leakage flows occur from the pressure side to the suction side reducing efficiency
Solution Approach 1:
The suction appliance extracts the harmful leakage flow from the system by creating a separate extraction path. The leakage flow that would otherwise mix with the main flow is instead diverted through the suction appliance's extraction opening into a suction channel, removing it from the harmful interaction zone and preventing the blockage effect on the main flow
Solution Approach 2:
The flow path is segmented into separate channels: the main flow channel and the suction channel. The suction appliance creates a distinct extraction path with its own opening and channel, separating the leakage flow handling from the main flow path. This segmentation prevents the leakage flow from interfering with the main flow while maintaining independent control over leakage extraction
2Adaptability or versatility
If platforms are mounted adjustable with respect to the housing appliance, then adaptability to different operating conditions is improved, but leakage flows increase due to the flow area between platform and housing appliance
Solution Approach 1:
The suction appliance converts the harmful leakage flow into a beneficial controlled extraction. By providing the suction opening and channel, the design transforms the unwanted leakage path into a useful feature where the leakage flow is deliberately extracted and utilized, changing its harmful effect into a beneficial one that improves overall efficiency
Solution Approach 2:
The suction appliance acts as an intermediary element between the annular channel and the external environment. It provides a controlled interface through the suction opening and channel, mediating the leakage flow by directing it through a specific path rather than allowing uncontrolled mixing with the main flow, thus reducing the harmful blockage effect
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 solution significantly reduces the mass flow of leakage into the main flow, leading to improved efficiency and reduced specific fuel consumption, and also benefits downstream blade devices by minimizing lossy interactions, thus enhancing the overall performance of the continuous-flow machine.
Implementation Method 1
at least one suction appliance is provided that is adjoining the flow area and is formed by a recess, via which working fluid can be conducted away from the flow area during operation of the stator device
Implementation Method 2
A stator device with a suction appliance that creates a lower static pressure area to divert and extract leakage flows away from the main flow
Data Source
AI summary
A stator device for a continuous-flow machine with guide vanes circumferentially distributed on a housing. The guide vanes are respectively embodied with a blade leaf and at least one platform. The platforms form a surface of an annular channel through which working fluid flows. A flow area is provided via which, during operation of the stator device, a working fluid flows on a side of the platform that is facing away from the annular channel from a pressure side of the blade leaf to a suction side of the blade leaf at least in certain areas in the radial direction of the stator device. At least one suction appliance is provided which adjoins the flow area and is formed by a recess, and via which working fluid can be conducted out of the flow area during operation of the stator device.