Swirl Vane Assembly: Component for Flame Stabilization

Product Specifications

Technical details and manufacturing context for Swirl Vane Assembly

Definition

The Swirl Vane Assembly is a critical sub-component within a Flame Retention Device. It consists of multiple curved or angled vanes arranged in a circular pattern. Its primary function is to create a controlled swirling motion in the incoming air or air-fuel mixture. This induced swirl enhances turbulence, promotes better mixing of fuel and oxidizer, and creates a central recirculation zone that anchors and stabilizes the flame, preventing blow-off and improving combustion efficiency and stability. The assembly is positioned in the flow path of air or premixed gas entering the combustion chamber. As the fluid passes through the angled vanes, its linear momentum is converted into angular momentum, creating a strong rotational flow (swirl). This swirling flow generates a low-pressure zone along the central axis, which draws hot combustion products back towards the burner head. This recirculation of hot gases continuously ignites the incoming fresh mixture, creating a stable flame root and improving flame holding capability. Typical design parameters include a vane count of 8 to 16, vane angles of 30 to 60 degrees, outer diameters of 100 to 500 mm, inner diameters of 50 to 200 mm, and vane thicknesses of 2 to 6 mm. Materials commonly specified are heat-resistant stainless steels such as 310S or 253MA, and high-temperature nickel alloys like Inconel. Operating temperature ranges from -20°C to 800°C, with pressures from 0.1 to 1.6 MPa. Surface roughness is typically Ra 3.2 to 6.3 μm, and concentricity is within 0.05 to 0.1 mm. Weight varies from 5 to 50 kg depending on size and material. These values are reference ranges and must be verified for the specific model and application. Always confirm material grades, standards, and performance with the legal manufacturer or supplier.

Working Principle

The assembly is positioned in the flow path of air or premixed gas entering the combustion chamber. As the fluid passes through the angled vanes, its linear momentum is converted into angular momentum, creating a strong rotational flow (swirl). This swirling flow generates a low-pressure zone along the central axis, which draws hot combustion products back towards the burner head. This recirculation of hot gases continuously ignites the incoming fresh mixture, creating a stable flame root and improving flame holding capability.

Common Materials

Heat-resistant stainless steel (e.g., 310S, 253MA), High-temperature nickel alloys (e.g., Inconel)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Vanes	8–16 pcs	Affects swirl intensity and pressure drop.
Vane Angle	30–60 deg	Determines swirl number and flame stability.
Outer Diameter	100–500 mm	Matches duct or burner opening.
Inner Diameter	50–200 mm	Hub size for shaft or center body.
Vane Thickness	2–6 mm	Strength and erosion resistance.
Material Grade	304–310S SS	High-temperature corrosion resistance.ASTM A240
Operating Temperature	-20–800 °C	Above 800°C requires superalloy.
Operating Pressure	0.1–1.6 MPa	Below 0.1 MPa swirl may be insufficient.ISO 5208
Surface Roughness	Ra 3.2–6.3 μm	Smoother reduces flow resistance.ISO 1302
Concentricity	0.05–0.1 mm	Ensures uniform flow distribution.ISO 1101
Weight	5–50 kg	Depends on size and material.

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

Components / BOM

Vane Part
Individual aerodynamic surface that deflects the flow to create rotation.

Material: Heat-resistant steel or alloy
Hub / Centerbody Part
Central structure that supports and positions the vanes; often contributes to bluff body stabilization.

Material: Cast heat-resistant alloy
Retaining Ring / Shroud Part
Outer circumferential ring that holds the vane ends and defines the flow passage outer diameter.

Material: Sheet metal or machined ring

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Flame Retention Device

View system integration details

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Frequently Asked Questions

What is the primary function of a Swirl Vane Assembly?

The primary function is to impart a swirling motion to the incoming air or fuel-air mixture, which enhances mixing and creates a recirculation zone that stabilizes the flame, preventing blow-off and improving combustion efficiency.

What materials are typically used for Swirl Vane Assemblies?

Common materials include heat-resistant stainless steels such as 310S or 253MA, and high-temperature nickel alloys like Inconel. The choice depends on operating temperature and corrosion requirements.

What are the typical design parameters for a Swirl Vane Assembly?

Typical parameters include vane count of 8-16, vane angle of 30-60 degrees, outer diameter of 100-500 mm, inner diameter of 50-200 mm, and vane thickness of 2-6 mm. These are reference ranges and must be confirmed for the specific application.

How does the Swirl Vane Assembly affect flame stability?

The swirling flow creates a low-pressure zone along the central axis, which recirculates hot combustion products back to the burner head. This continuous ignition of fresh mixture stabilizes the flame root and improves flame holding capability.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 50 bar
flow rate:	0.5 to 50 m³/s
temperature:	-50°C to 1000°C
slurry concentration:	Up to 10% solids by volume

Swirl Vane Assembly

Product Specifications

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