1. Core Features
1.1 Material and Mechanical Properties
Medium to high strength with excellent rigidity: Typically, 5-series (e.g., 5052) or 6-series (e.g., 6061) aluminum alloys are employed. Through heat treatment (T6 state), these alloys achieve high yield strength, capable of withstanding substantial aerodynamic loads and centrifugal forces while maintaining minimal deformation during high-speed rotation.
Excellent fatigue resistance: As a metal material, its fatigue strength and crack propagation toughness are superior to many non-metallic materials, capable of withstanding long-term start-stop cycles and alternating stresses caused by wind speed variations, ensuring a long and predictable service life.
Moderate density: With a density of approximately 2.7g/cm³, it is significantly higher than FRP and carbon fiber, yet achieves excellent lightweight performance through its hollow thin-walled structure design.
1.2 Manufacturing and Structural Characteristics
Precision forming process: The mainstream methods employ integral drawing or extrusion forming, enabling the production of aerodynamically efficient wing profiles. This hollow structure achieves maximum lightweight while maintaining structural integrity.
Excellence in dynamic balancing: The uniform microstructure of metal materials and precise internal stress control enable effortless and long-term maintenance of high-precision dynamic balancing (typically reaching G6.3 or higher), forming the foundation for stable operation and minimal vibration.
Versatile surface treatments: Anodizing, sandblasting, and high-performance anti-corrosion coatings (e.g., fluorocarbon paint) are available, with customized protection levels tailored to specific corrosive environments.
1.3 Environmental Adaptability
Corrosion resistance has limitations: In normal atmospheric and clear water environments, the surface oxide film provides good corrosion resistance. However, in high humidity, high salt spray (coastal), or acidic environments containing sulfur and chloride ions (chemical), surface coating protection is required, and its long-term corrosion resistance is inferior to that of FRP.
Heat resistance and flame retardancy: It operates within a wide temperature range (typically-40℃ to 150℃) and is non-flammable, ensuring high safety.
2. Core Advantages
2.1 High Comprehensive Reliability
Low risk of structural failure: Aluminum alloys exhibit superior creep resistance and resistance to sudden brittle fracture, offering enhanced fault tolerance and safety under complex operating conditions and accidental impacts (e.g., foreign body ingestion).
Predictable and long service life: In non-extreme corrosion environments, its metal fatigue life model is well-established. As long as the design load is maintained, the service life remains highly stable, typically exceeding 10 years.
2.2 Maintain convenience and economy
High repairability: This is its core advantage over FRP and carbon fiber. After edge wear, cracking, or localized impact damage, reliable repairs can be performed using processes such as TIG welding, followed by rebalancing for reuse, significantly reducing replacement costs.
The maintenance system is well-established: As a traditional material, its inspection, maintenance, and repair processes and standards are highly mature across the industry, making them easy to operate.
2.3 Excellent performance-to-cost ratio
Controllable initial costs: With mature raw material costs and processing techniques, the initial procurement cost is typically lower than that of high-performance FRP of equivalent specifications and significantly lower than carbon fiber products.
The total life cycle cost may be lower: With its long service life, low failure rate, and repairability, the total cost of ownership (TCO) for long-term use in non-strong corrosion environments may be more advantageous.
3. Core Role
3.1 Core driving force: Propelling airflow
As the sole working component of the fan, it efficiently converts the rotational mechanical energy of the motor into kinetic and pressure energy of the air, generating a stable and sufficient forced airflow. This serves as the fundamental power source for both evaporative cooling and convective cooling in cooling towers.
3.2 Key Performance Determinants: Influence on Efficiency and Energy Consumption
Determine the air volume and pressure: The diameter, installation angle, airfoil design, and rotational speed directly determine the cooling tower's ventilation capacity, thereby affecting the air-to-water ratio and the final cooling efficiency.
Directly impacts fan energy consumption: Fan energy consumption constitutes the majority of total cooling tower energy consumption. The aerodynamic efficiency of the blades and their weight directly determine the motor load, which is the key to energy conservation. High-efficiency aluminum alloy airfoil blades significantly outperform traditional solid steel plate blades in energy savings.
3.3 System operation assurance function:
Ensuring stable operation: The superior dynamic balancing performance guarantees smooth fan operation with minimal vibration and noise, thereby protecting the motor and transmission system (bearings, reducer) from excessive wear and extending the main unit's service life.
Adaptability to complex operating conditions: Its high strength and fatigue resistance enable it to withstand grid fluctuations, sudden start-stop cycles, and gusty wind impacts, ensuring more stable and reliable operation.
