Centrifugal Compressor Inlet Guide Vane Structure for Low-Load Flow Stability
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Solution Overview
Problem
Centrifugal compressors face issues with structural configuration, gas flow conditions, and noise reduction in their existing inlet guide vane (IGV) mechanisms, leading to inefficiencies and adverse effects under low load conditions.
Innovation Solution
The IGV mechanism features a flow guide body with streamlined contours and a support structure that includes airfoil blades and a rotating shaft, reducing airflow losses and noise by ensuring stable airflow and minimizing aperture size, with a partially spherical surface design to optimize gas flow and reduce turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional IGV mechanism is used to control gas flow quantity, then the compressor can adjust working conditions, but flow losses increase and efficiency decreases under low load conditions
Solution Approach 1:
The patent applies curved surface design to the flow guide body and support rods, using streamlined contours and spherical surface elements to guide airflow smoothly. This curvature design reduces flow separation and turbulence, minimizing flow losses while maintaining the ability to adjust working conditions through IGV rotation.
Solution Approach 2:
The flow guide body is divided into multiple sections (front end section, middle section, rear end section) with different functional characteristics. Each section has optimized curvature radius to handle airflow at different stages, allowing efficient flow control across various operating conditions without excessive energy loss.
2Productivity
If IGV mechanism adjusts inlet flow by changing vane opening, then gas flow quantity is controlled, but aerodynamic noise increases due to flow turbulence
Solution Approach 1:
The curved surface design in the flow guide body and support rods creates smooth airflow paths that reduce turbulence and vortex formation. This streamlined geometry minimizes aerodynamic noise generation while maintaining effective gas flow control capability across different operating conditions.
3Ease of manufacture
If conventional IGV structure is employed, then the mechanism is simple to manufacture, but structural configuration is insufficient leading to poor flow guidance
Solution Approach 1:
The patent incorporates curved surface elements and streamlined contours into the flow guide body and support rods. These geometric features improve flow guidance capability by reducing flow separation and turbulence, while still being manufacturable using conventional forming processes for metal components.
4Productivity
If IGV mechanism operates under low load conditions, then part-load efficiency is needed, but existing mechanisms cause flow instability and performance degradation
Solution Approach 1:
The flow guide body is segmented into multiple sections with progressively varying curvature radii. This segmentation allows each section to optimize flow guidance for different flow rates, maintaining flow stability and preventing turbulence even when the compressor operates at low load conditions with reduced airflow.
Solution Approach 2:
The streamlined curved surfaces and spherical surface elements in the flow guide body provide smooth flow transitions that remain effective across a wide range of operating conditions. This geometric design maintains flow stability under part-load operation by preventing flow separation and reducing turbulence intensity.
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 configuration enhances the efficiency of the centrifugal compressor by minimizing flow losses and aerodynamic noise, ensuring stable air supply and improved performance under low load conditions, thus broadening the range of stable operating conditions and enhancing user experience.
Implementation Method 1
a flow guide body having a front end section, a middle section and a rear end section, wherein the front end section, the middle section and the rear end section respectively have streamlined contours
Implementation Method 2
a plurality of inlet guide vanes rotatably fixed in the circumferential direction of the middle section of the flow guide body through a rotating shaft
Data Source
AI summary
An inlet guide vane mechanism comprises: a flow guide body having a front end section, a middle section and a rear end section, wherein the front end section, the middle section and the rear end section respectively have streamline contours in symmetry about the impeller axis and are transitionally connected by smooth curved surfaces, the flow guide body comprises an air inlet pipe arranged along the impeller axis, one end of the air inlet pipe being fixed at the front end section of the flow guide body, and the other end thereof being fixed at the rear end section of the flow guide body; a support structure for fixing the flow guide body at the air inlet end of the centrifugal compressor; and a plurality of inlet guide vanes rotatably fixed in the circumferential direction of the middle section of the flow guide body through a rotating shaft thereof, respectively.