Control Systems in Gas Turbine Engines

The video tutorial explains fuel control in gas turbine engines, focusing on hydro mechanical systems. It covers the role of throttle valves and pressure relief valves in maintaining constant pressure for fuel flow. The tutorial derives energy and mass flow equations, emphasizing the importance of area and pressure drop in fuel metering. The final equation highlights how varying the throttle valve controls mass flow.

What are the two basic types of control systems used in gas turbine engines?

• Hydro-mechanical and electronic

• Electronic and pneumatic

• Hydraulic and pneumatic

• Mechanical and pneumatic

In the hydro-mechanical system, what two factors is fuel flow dependent upon?

• Throttle position and speed

• Temperature and pressure

• Orifice area and pressure drop

• Fuel type and temperature

What happens to the throttle valve area as the pilot moves the throttle?

• It decreases only

• It remains constant

• It varies, increasing or decreasing

• It increases only

What effect does the throttle valve have on the flow, making it venturi-like?

• Decreases temperature

• Increases temperature

• Decreases pressure and area

• Increases pressure and area

Why is a pressure relief valve used across the throttle valve?

• To increase fuel flow

• To maintain constant pressure drop

• To increase pressure drop

• To decrease fuel flow

What is the primary purpose of keeping the pressure drop constant in fuel metering?

• To ensure fuel flow depends only on orifice area

• To increase engine temperature

• To reduce engine noise

• To increase fuel efficiency

What principle is used to derive the fuel flow equation in the video?

• Newton's Laws

• Conservation of Mass

• Conservation of Energy

• Thermodynamics

In the derivation, what assumption is made about the density of the fuel?

• It increases with pressure

• It remains constant

• It decreases with temperature

• It changes with speed

What is the relationship between mass flow rate and density in the derivation?

• Mass flow rate is equal to density

• Mass flow rate is inversely proportional to density

• Mass flow rate is independent of density

• Mass flow rate is directly proportional to density

What is the final expression for fuel flow dependent on?

• Temperature and pressure

• Area and pressure drop

• Speed and temperature

• Throttle position and speed