What feature of turbine nozzles accommodates thermal expansion?

The feature of turbine nozzles that accommodates thermal expansion is variable geometry. This technology allows the nozzle shape to change in response to temperature fluctuations and varying operational conditions. As the temperature increases, components expand, and variable geometry nozzles can adjust their shape accordingly. This adaptability ensures optimal airflow and performance across a range of operating conditions, allowing the engine to operate efficiently and effectively under varying loads.

Moreover, variable geometry helps maintain the performance characteristics of the engine by optimizing the nozzle area and minimizing losses that may occur from thermal expansion. This enhances the turbine's overall efficiency and power output, proving crucial in high-performance applications like gas turbines.

While options involving flexibility, cooling fins, and expansion joints may also relate to thermal management to some extent, they do not provide the same direct mechanism for adjusting to the thermal expansions experienced in gas turbine nozzles as variable geometry does.