Why are the high-pressure turbine blades...

Why are the high-pressure turbine blades...

Question 1 of 2707066636eed28f7522a1c51e102

Why are the high-pressure turbine blades generally of the impulse/reaction type?

Question 1 of 27070

Q

Why are the high-pressure turbine blades generally of the impulse/reaction type?

🔍 Key Concepts

• Impulse vs. reaction blades in steam or gas turbines • How pressure and velocity change across impulse and reaction stages • Effects of pressure difference between root and tip on leakage/air flow over the blade tip

💭 Think About

• Think about how stress and loading are distributed on a blade when only part of it does the pressure-drop work versus when the work is shared along the span. • Consider what happens to the working fluid (steam/air) if the blade-tip pressure is higher or lower than the root pressure—how would that affect leakage across the tip clearance? • Ask yourself which design goal is more critical for high-pressure turbine stages: stress distribution, leakage control, or both together.

✅ Before You Answer

• Check which blade type (pure impulse, pure reaction, or impulse/reaction) best shares the aerodynamic and mechanical loading over the blade height. • Verify how tip leakage flow is driven by pressure differences and which option correctly states the relationship between tip and root pressure. • Make sure the choice you pick is consistent with both structural (stress) and aerodynamic (leakage) considerations, not just one or the other.