3122633-01 Combustion Liner

Overview

The 3122633-01 Combustion Liner is a critical component used in aircraft gas turbine engines, particularly in engines associated with the PT6A series produced by Pratt & Whitney Canada. The combustion liner forms the inner structure of the combustion chamber where fuel and compressed air mix and burn to generate high-temperature gases that drive the turbine stages.

Because the combustion liner operates in an extremely demanding environment—exposed to high temperatures, thermal cycling, pressure fluctuations, and corrosive combustion gases—its design and manufacturing require advanced materials and precision fabrication techniques.

HGTP provides precision manufacturing services for turbine combustion liners and other hot-section components, supporting aerospace and energy industries with advanced machining, high-temperature alloy processing, and strict quality control systems.

Function of the Combustion Liner

The combustion liner is positioned inside the combustion chamber of a gas turbine engine. It plays a vital role in controlling and stabilizing the combustion process.

Key functions include:

• Containing the combustion flame within the chamber

• Mixing fuel and compressed air for efficient combustion

• Protecting the outer combustion case from direct flame exposure

• Allowing cooling air to flow along the liner surface

• Ensuring stable gas flow toward the turbine stages

Proper combustion liner design improves fuel efficiency, engine stability, and overall turbine performance.

Materials Used in Combustion Liners

Due to extreme operating conditions, combustion liners must be made from high-temperature resistant alloys capable of maintaining mechanical strength at elevated temperatures.

Nickel-Based Superalloys

Nickel-based alloys are widely used in combustion liners because of their excellent high-temperature properties.

Typical materials include:

• Inconel 625

• Inconel 718

• Hastelloy X

These materials provide:

• Excellent oxidation resistance

• High mechanical strength at elevated temperatures

• Resistance to thermal fatigue and creep

• Long service life in combustion environments

Heat-Resistant Stainless Steel

Some combustion liner structures use stainless steel alloys designed for thermal stability, including:

• AISI 321 stainless steel

• AISI 347 stainless steel

These alloys offer good oxidation resistance and structural stability under repeated heating cycles.

Manufacturing Process

Manufacturing a combustion liner such as the 3122633-01 requires specialized fabrication techniques and high-precision machining processes.

HGTP utilizes a combination of advanced technologies to produce turbine hot-section components.

Sheet Metal Forming

Combustion liners are often manufactured from high-temperature alloy sheets using forming processes such as:

• rolling

• deep drawing

• precision press forming

These processes create the cylindrical geometry required for combustion chambers.

Precision Welding

Because combustion liners are often assembled from multiple formed sections, welding plays a critical role in manufacturing.

Common welding methods include:

• TIG welding

• laser welding

• electron beam welding

These processes ensure strong joints while minimizing distortion caused by high temperatures.

CNC Machining

After fabrication, CNC machining is used to finish critical features including:

• mounting flanges

• bolt holes

• interface surfaces

• sealing edges

HGTP uses multi-axis CNC machining centers to ensure tight tolerances and precise alignment with turbine assemblies.

Cooling Hole Drilling

Combustion liners include numerous precision cooling holes designed to create a protective air film over the liner surface. This film cooling system prevents direct exposure to extremely hot combustion gases.

Typical cooling hole specifications include:

Diameter
0.5 mm – 2 mm

Manufacturing methods:

• laser drilling

• EDM drilling

• precision mechanical drilling

Proper placement and size of cooling holes are essential for maintaining thermal protection.

Technical Specifications

While the exact dimensions of the 3122633-01 Combustion Liner depend on engine configuration, typical parameters for similar turbine combustion liners include:

Outer diameter
200 mm – 600 mm

Wall thickness
1.5 mm – 5 mm

Operating temperature
900°C – 1200°C

Cooling hole diameter
0.5 mm – 2 mm

Tolerance for critical features
±0.02 mm – ±0.05 mm

Surface roughness
Ra 0.8 – 1.6 μm

These specifications ensure the liner can withstand the extreme conditions present in gas turbine combustion systems.

Inspection and Quality Control

Because combustion liners are safety-critical components in turbine engines, strict inspection procedures are required during manufacturing.

HGTP implements comprehensive quality control processes, including:

Dimensional Inspection

High-precision measuring equipment such as CMM machines ensures all dimensions meet engineering specifications.

Non-Destructive Testing (NDT)

Common inspection methods include:

• dye penetrant testing

• ultrasonic inspection

• radiographic testing

These tests detect cracks, porosity, and other structural defects without damaging the component.

Material Verification

Material testing ensures compliance with aerospace standards through:

• hardness testing

• metallographic analysis

• chemical composition verification

Applications

The 3122633-01 Combustion Liner is used in aircraft turbine engines and related propulsion systems.

Typical applications include:

• turboprop aircraft engines

• aerospace propulsion systems

• turbine engine maintenance and overhaul (MRO)

• aviation spare parts replacement

Such components are essential for maintaining efficient combustion, safe engine operation, and long turbine service life.

Precision Turbine Components by HGTP

HGTP specializes in the production of high-temperature turbine components, supporting aerospace and energy industries worldwide.

Our capabilities include:

• multi-axis CNC machining

• machining of nickel-based superalloys

• precision cooling hole drilling

• turbine combustion component fabrication

• prototype and batch production

With advanced equipment and experienced engineers, HGTP delivers reliable high-precision components designed for demanding turbine environments.

Conclusion

The 3122633-01 Combustion Liner is a vital component in turbine combustion systems, responsible for maintaining stable combustion while protecting engine structures from extreme temperatures.

Through advanced materials, precise fabrication processes, and rigorous inspection standards, HGTP provides high-performance turbine components that meet the demanding requirements of modern aerospace and power generation applications.