Blades/Aerofoils: Chord Length 50-300 mm, Aspect Ratio 1.5-4.0

Component Specifications

Definition

Turbine blades, also known as aerofoils, are precision-engineered components mounted radially on a turbine wheel's rotor disk. They convert kinetic energy from expanding gases (in gas turbines) or steam (in steam turbines) into rotational mechanical energy through aerodynamic lift and impulse principles. Their complex 3D geometries include airfoil profiles, twist, lean, and sophisticated cooling channels for high-temperature applications.

Working Principle

Operate on aerodynamic principles where high-velocity fluid flow creates pressure differentials across the blade's airfoil profile, generating lift forces that impart torque to the turbine wheel. In impulse turbines, blades redirect fluid flow to transfer momentum; in reaction turbines, blades accelerate fluid while experiencing reaction forces. The energy conversion follows Euler's turbine equation relating fluid velocity triangles to mechanical work output.

Materials

High-temperature nickel-based superalloys (Inconel 718, Rene N5), titanium alloys (Ti-6Al-4V), single-crystal alloys for critical applications. Advanced coatings include thermal barrier coatings (yttria-stabilized zirconia) and environmental coatings (aluminide, platinum-aluminide). Composite materials (ceramic matrix composites) for next-generation designs.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Twist Angle	15-45 degrees
Aspect Ratio	1.5-4.0
Chord Length	50-300 mm
Surface Roughness	Ra < 0.4 μm
Cooling Efficiency	>0.7
Leading Edge Radius	0.5-2.0 mm
Trailing Edge Thickness	0.1-0.3 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 12179, ISO 4287, DIN EN ISO 1101, ASME PTC 6

Parent Products

This component is used in the following industrial products

Turbine Wheel

A rotating component in a turbocharger that converts exhaust gas energy into mechanical rotation to drive the compressor wheel.

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Engineering Analysis

Risks & Mitigation

High-cycle fatigue from resonant vibrations
Creep deformation under sustained high temperatures
Thermal-mechanical fatigue from thermal gradients
Erosion/corrosion from particulate matter
Foreign object damage (FOD)

FMEA Triads

Trigger: Resonant vibration at natural frequencies
Failure: High-cycle fatigue cracking leading to blade separation
Mitigation: Modal analysis during design, damping features, mistuning, active clearance control

Trigger: Exceedance of material temperature limits
Failure: Creep rupture and microstructural degradation
Mitigation: Advanced cooling schemes, thermal barrier coatings, temperature monitoring systems

Trigger: Thermal gradients during transient operations
Failure: Thermal-mechanical fatigue cracks at stress concentrations
Mitigation: Optimized thermal profiles, reduced constraint designs, improved material ductility

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Profile tolerance ±0.05 mm, position tolerance ±0.02 mm, surface finish Ra 0.4-0.8 μm

Test Method

Coordinate measuring machines (CMM) for geometric verification, fluorescent penetrant inspection (FPI) for surface defects, ultrasonic testing for internal flaws, modal analysis for vibration characteristics

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Blades/Aerofoils

Manufacturer profiles associated with Blades/Aerofoils.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between impulse and reaction turbine blades?

Impulse blades operate by redirecting fluid flow through fixed nozzles onto curved blades, converting kinetic energy through momentum change. Reaction blades accelerate fluid through converging passages between blades, utilizing both impulse and reaction forces with typically higher efficiency.

Why are turbine blades twisted along their length?

Blade twist compensates for varying tangential velocities from hub to tip, optimizing incidence angles across the span to maintain efficient aerodynamic loading and prevent flow separation under different rotational speeds.

How do cooling channels in turbine blades work?

Internal serpentine passages circulate cooler air (bled from compressor stages) through the blade, with film cooling holes ejecting air to form protective layers over the surface, allowing operation above material melting points.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Blades/Aerofoils