Compressor Stabilizer Channel Segmentation for Surge Margin
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Solution Overview
Problem
Radial and diagonal compressors face limitations in map width and characteristic curve slope due to surge limit and flow instability, particularly at high pressure ratios, leading to unexpected surges and reduced efficiency.
Innovation Solution
A stabilizer channel with an annular chamber surrounding the main flow channel, featuring a separating element and flow guiding elements at the inlet and outlet to split and guide the flow, reducing tip gap vortices and improving suction uniformity, thereby enhancing stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bypass/stabilizer channel is used, then the surge limit is approached, but the map width decreases and characteristic curve slope becomes shallow
Solution Approach 1:
The stabilizer channel flow is divided into multiple segments using separating elements. The flow inlet is split into first and second inlet channels, and the flow outlet is split into first and second outlet channels. This segmentation allows independent control of different flow paths, enabling the system to maintain stability near surge limit while preserving map width through optimized flow distribution.
Solution Approach 2:
Flow guiding elements are introduced as intermediary components between the stabilizer channel and the main flow path. These elements mediate the interaction between the bypass flow and the main compressor flow, controlling the mixing and momentum exchange to prevent excessive work conversion while maintaining flow attachment, thus resolving the contradiction between surge margin and map width.
2Reliability
If mass flow is diverted into the stabilizer chamber, then the characteristic curve becomes shallow, but work conversion increases
Solution Approach 1:
Different regions of the stabilizer channel are given different flow characteristics through localized flow control. The separating elements create zones with different flow velocities and directions - the first inlet channel may have different flow properties than the second inlet channel. This local differentiation allows the system to maintain stability where needed while minimizing energy loss in other regions.
Solution Approach 2:
The flow guiding elements change the parameters of the bypass flow before it re-enters the main flow path. By adjusting flow direction, velocity, and distribution through the separating and guiding elements, the system modifies the work conversion characteristics to reduce excessive energy conversion while maintaining the stabilizing effect near the surge limit.
3Productivity
If the compressor operates at high pressure ratio, then absorption capacity increases, but incidence angles deteriorate and flow separation occurs
Solution Approach 1:
The stabilizer channel provides preliminary flow conditioning before the main compressor wheel. By pre-adjusting the flow distribution and reducing incidence angles through the controlled bypass path, the system prepares the flow for high pressure ratio compression, preventing flow separation and maintaining stable attachment even at high absorption capacity operating points.
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 improves the map width and characteristic curve slope of compressor stages, reducing noise and vibration, and providing better stability and efficiency compared to conventional configurations.
Implementation Method 1
an inflow into the annular stabilizer chamber and/or an outflow out of the annular stabilizer chamber are/is split transversely with respect to the main flow direction of the main flow channel
Implementation Method 2
at least one flow guiding element is arranged in at least one of the flow inlet and the flow outlet
Data Source
AI summary
The invention relates to a stabilizer channel having an annular stabilizer chamber which encloses a main flow channel in the intake region of a compressor wheel and is delimited from the main flow channel by an annular bridge. The annular stabilizer channel is connected to the main flow channel via a downstream flow inlet and an upstream flow outlet. At least one separating element (T) is arranged in at least one of the flow inlet and the flow outlet, with the result that an inflow into the annular stabilizer chamber and/or an outflow out of the annular stabilizer chamber are/is split transversely with respect to the main flow direction of the main flow channel. At least one flow guiding element is arranged in at least one of the flow inlet and the flow outlet.