What causes burner can shift?

• A. Ignition timing issues
• B. Misalignment of combustion liners
• C. Fuel pressure fluctuations
• D. Thermal expansion mismatch

Answer: (B)

Maintaining the burner can in the correct position depends on precise alignment of the combustion liners with the burner can and the surrounding casing. When the combustion liners are misaligned, the burner can no longer sit coaxially and the clearances around it become uneven. As the engine runs and the parts heat up and experience flow forces, that misfit causes the can to bind and move from its intended position. In short, the misalignment itself directly leads to the burner can shifting. Ignition timing affects flame ignition rather than the can’s position, fuel pressure fluctuations affect flame stability rather than orientation, and thermal expansion mismatch can worsen movement but only as a consequence of the initial misalignment.