Axial Compressor Stall Control via Pulsative Air Injection
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Solution Overview
Problem
Conventional axial compressors experience stalls when a threshold point is exceeded during driving in low-flow high-pressure sections, leading to inefficiencies and safety concerns, with current solutions being costly and experimentally challenging to verify.
Innovation Solution
An axial compressor design with a stall controller that injects highly-pressurized compressed air using methods like pulsative, linear, or stepwise injection to prevent stalls, reducing power expenditure and minimizing expensive air usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly-pressurized compressed air is injected to suppress stalls, then stall prevention effectiveness is improved, but power consumption and operational cost increase
Solution Approach 1:
The control unit detects operating conditions approaching the stall threshold and initiates compressed air injection before actual stall occurs. This preliminary intervention prevents the harmful stall condition while using minimal air injection, thereby reducing power consumption compared to continuous or reactive injection methods
Solution Approach 2:
The system applies compressed air injection only partially - specifically when and where needed near the stall threshold - rather than continuously or excessively. The control unit modulates the injection amount based on real-time operating parameters, achieving effective stall prevention with minimized energy expenditure
2Stability of the object's composition
If compressed air injection is used to prevent stalls, then operational stability is improved, but operational cost increases due to high air consumption
Solution Approach 1:
The control unit continuously monitors operating parameters (flow rate, pressure, temperature) and uses this feedback to dynamically adjust compressed air injection. When parameters indicate approaching stall conditions, injection is activated; when stable operation is restored, injection is reduced or stopped, thereby maintaining operational stability while minimizing air consumption and operational cost
Solution Approach 2:
The system changes the parameters of compressed air injection (amount, timing, duration) based on real-time operating conditions. By adjusting these parameters dynamically rather than using fixed injection rates, the system maintains operational stability while optimizing air consumption to reduce operational costs
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
Effectively suppresses or prevents stalls during high-efficiency operations, reducing power consumption and achieving economically feasible control by optimizing air injection methods.
Implementation Method 1
a stall controller configured to suppress or prevent a stall that may occur during rotation of the axial impeller by supplying highly-pressurized compressed air into the casing according to a preset time and volume
Implementation Method 2
The pulsator may increase a supplied volume of the compressed air in a stepwise manner after injection of the highly-pressurized compressed air begins
Data Source
AI summary
A fluid stabilizing control method of an axial compressor is provided, which includes driving to drive the axial impeller, and stall controlling to suppress or prevent an occurrence of a stall that may transpire during rotation of the axial impeller by supplying highly-pressurized compressed air into the casing through a stall controller according to a predetermined time and volume. Accordingly, a stall may be suppressed or prevented, the occurrence of a stall that may transpire when a threshold point is exceeded by an unexpected event during driving in a low-flow high-pressure section on a performance curve, in which efficiency is high. Additionally, since an air injection method for suppressing the stall is properly applied, an amount of power expended for the stall control may be reduced while supply of the high-pressure compressed air is minimized, thereby achieving economically feasible stall control.