Why did early gas-turbine engineers struggle to build efficient compressors and turbines?

Early gas-turbine engineers faced significant hurdles in developing efficient compressors and turbines due to complex aerodynamic challenges and material limitations.

Aerodynamic Challenges

For compressors, the primary struggle was maintaining high efficiency without inducing "stalling." Designers had to manage airflow over closely spaced, highly curved airfoil blades, where factors like flow friction, leakage, and secondary circulation caused energy losses. Because compressors can only handle small pressure increases per stage, they require many stages; however, attempting higher pressure ratios often caused airflow to separate from the blades, leading to turbulence and a loss of engine power.1

Material and Structural Constraints

Engineers also struggled with the extreme operating environment of the engine. Components were subjected to high mechanical loads, corrosive gases, and intense heat.2
* Turbine Stress: High temperatures at the turbine inlet and centrifugal stresses required the development of specialized superalloys capable of maintaining strength under severe stress.34
* Blade Design: Blades had to be aerodynamically precise while remaining lightweight and resistant to critical vibrations. To survive, turbine blades eventually required internal cooling passages and advanced manufacturing processes, such as growing them as single crystals.14