Flexible Guide Vane Structure for Mixed Flow Pump Stall Mitigation
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Solution Overview
Problem
Mixed flow pumps face issues with rotating stall effects and efficiency decline when flow rates decrease, leading to abnormal vibrations due to mismatched flow areas in the impeller or guide vane channels, with existing solutions focusing on impeller improvements but not addressing guide vane stalls effectively.
Innovation Solution
A flexible guide vane structure with an adjustable flow area is introduced, featuring support ribs and a servo motor-driven mechanism that adjusts the shape of the guide vane in real-time to match changing flow conditions, optimizing the flow field and maintaining efficiency across a wide range of operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the guide vane flow area is designed based on rated flow conditions, then the pump performs well at the rated operating point, but the flow area becomes much larger than required at reduced flow rates, causing rotating stall effects and efficiency decline
Solution Approach 1:
The guide vane structure is transformed from a fixed configuration to a dynamically adjustable one. Multiple support ribs are arranged at different angles around the guide vane, and by selectively adjusting the position of these support ribs, the guide vane can assume different shapes to match various flow conditions, eliminating rotating stall effects at reduced flow rates
Solution Approach 2:
The invention changes the geometric parameters of the guide vane by adjusting the positions of support ribs. This allows the flow area and guide vane angle to be varied according to the operating flow rate, optimizing performance across different operating points rather than being fixed for rated conditions only
2Reliability
If the guide vane flow area is reduced to match low flow conditions, then rotating stall effects are eliminated, but the pump cannot meet the demand of multi operating points and wide efficient areas
Solution Approach 1:
The adjustable support rib mechanism enables the guide vane to dynamically adapt its geometry. When high flow rates are required, the guide vane maintains a larger flow area; when flow rates are reduced, the support ribs adjust to reduce the flow area, preventing rotating stall. This dynamic adjustment provides both operational stability and adaptability across multiple operating points
Solution Approach 2:
The guide vane adjustment mechanism is segmented into multiple independent support ribs that can be adjusted individually or in groups. This segmentation allows for fine-tuned control of the guide vane shape, enabling precise matching of the flow area to different operating conditions while maintaining the ability to serve multiple operating points
3Productivity
If a flexible guide vane adjusting device is added to enable real-time flow area adjustment, then the pump efficiency is improved across wide operating areas, but the device complexity increases
Solution Approach 1:
The flexible guide vane adjusting device introduces dynamic capability to the pump system. By incorporating adjustable support ribs that can change the guide vane geometry in real-time, the system achieves improved efficiency across wide operating areas. The complexity is managed by using a modular arrangement of support ribs that can be controlled through a centralized adjustment mechanism
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 solution allows for real-time adjustment of the guide vane flow area, enhancing the mixed flow pump's efficiency and operational stability by adapting to varying flow conditions, thus broadening its application scope without altering the original hydraulic design.
Implementation Method 1
each support rib base is driven by a group of base driving mechanisms, so as to drive the support rib to rotate; the support rib base is driven by different base driving mechanisms to rotate at different angles
Data Source
AI summary
A flexible guide vane structure of a mixed flow pump with adjustable flow area, a mixed flow pump and an adjustment method are provided. The flexible guide vane structure includes a flexible guide vane and a flexible guide vane adjusting device. The flexible guide vane adjusting device includes a support rib, a support rib base and a base driving mechanism. As the skeleton of the flexible guide vane, the support rib realizes the shape change of the flexible vane through the base driving mechanism and the support rib base. In the mixed flow pump, the flexible guide vane adjusting device is installed inside the blade hub. Through the flow section feedback regulation system, the angle of the support rib is adjusted based on the real-time working condition of the mixed flow pump to adjust the flow area of the blade and achieve the best working condition.