Compressor Swirl Nozzles for Part-Load Efficiency and Surge Margin
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Solution Overview
Problem
Existing compressors face challenges in achieving optimum efficiency during part-load conditions due to aerodynamic losses and surge margin issues, particularly in the impeller region.
Innovation Solution
Incorporating swirl nozzles downstream of inlet guide vanes and upstream of the impeller, with adjustable outlet directions and controlled fluid flow, to introduce swirl in the intake passage and optimize the incidence angle of fluid onto the impeller blades, thereby enhancing efficiency and surge margin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inlet guide vanes are used to control fluid flow, then flow control capability is improved, but aerodynamic losses increase under part-load conditions
Solution Approach 1:
The flow control function is segmented between inlet guide vanes and swirl nozzles. The inlet guide vanes provide coarse flow control, while the swirl nozzles provide fine adjustment of the incidence angle, allowing independent optimization of each component's function to reduce overall aerodynamic losses
Solution Approach 2:
The swirl nozzles act as an intermediary element between the inlet guide vanes and the impeller blades. They modify the fluid flow characteristics by introducing controlled swirl, thereby optimizing the incidence angle before the fluid reaches the impeller blades and reducing aerodynamic losses
2Use of energy by moving object
If fluid flow rate is reduced for part-load operation, then energy consumption is reduced, but compressor efficiency and surge margin deteriorate
Solution Approach 1:
The swirl nozzles change the flow parameters (incidence angle and swirl intensity) of the fluid entering the impeller. By adjusting these parameters, the compressor can operate efficiently at reduced flow rates, maintaining surge margin and efficiency even during part-load conditions
Solution Approach 2:
The system dynamically adjusts the swirl nozzle operation based on load conditions. During part-load operation, the swirl nozzles are activated to optimize flow characteristics, while during full-load operation, the inlet guide vanes provide primary control, creating a dynamic adaptation strategy
3Reliability
If swirl nozzles are added to optimize incidence angle, then compressor efficiency is improved, but device complexity increases
Solution Approach 1:
The swirl nozzles are designed to serve multiple functions: controlling incidence angle, introducing optimal swirl, and working in conjunction with inlet guide vanes. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The swirl nozzle assembly is integrated with the existing inlet structure and impeller system. The outlets are positioned to work in conjunction with the inlet guide vanes, merging the swirl generation function with the existing flow control architecture rather than adding completely separate 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 introduction of swirl nozzles improves compressor efficiency and surge margin by compensating for inlet guide vane effects, especially under part-load conditions, by optimizing fluid interaction with impeller blades.
Implementation Method 1
The swirl nozzles are configured to introduce fluid into the intake passage to cause swirl of fluid in the intake passage between the plurality of inlet guide vanes and the impeller
Implementation Method 2
The impeller includes a plurality of blades and directs fluid from the intake passage toward an outlet
Data Source
Figure 1~2
AI summary
A compressor (20) includes an inlet (22) defining an intake passage, a plurality of inlet guide vanes (24), an impeller (26), and a plurality of swirl nozzles (40). Fluid flow through the plurality of inlet guide vanes (24) into the intake passage is selectively adjustable to control fluid flow through at least the portion of the intake passage downstream of the swirl nozzles (40). The impeller (26) includes a plurality of blades (28) and directs fluid from the intake passage toward an outlet. The swirl nozzles (40) have outlets positioned downstream of the plurality of inlet guide vanes (24) and upstream of the impeller (26). The swirl nozzles (40) are configured to introduce fluid into the intake passage to cause swirl of fluid in the intake passage between the plurality of inlet guide vanes (24) and the impeller (26).