Thrust Propulsion

How turbofan engines are aerodynamically more efficient than turbo propeller engine? How energy produced from turbines is distributed in these engines?

Differentiate between ramjet and rocket. Enlist the advantages of ramjet.

A turbojet engine flying at a speed of $850 \text{ km/hr}$ consumes air at the rate of $46 \text{ kg/sec}$. Calculate (i) jet exit velocity, the enthalpy for the nozzle is $190 \text{ kJ/kg}$, (ii) flow rate of fuel, assuming air-fuel ratio is 82, (iii) thermal efficiency of the plant, (iv) propulsive power and thrust power, heating value of fuel is $44000 \text{ kJ/kg}$. Assume any data required.

What is propulsion? Differentiate between turbo propeller and turbo fan systems. Mention uses.

Differentiate between ramjet and rocket propulsion systems.

A turbojet engine flying at a speed of 790 km/hr consumes air at the rate of 45 kg/sec. Calculate (i) jet exit velocity, the enthalpy change for the nozzle is 185 kJ/kg, (ii) flow rate of fuel, assuming air-fuel ratio is 78, (iii) thermal efficiency of the plant, given heating value of fuel is 44000 kJ/kg, and (iv) propulsive power.

What do you mean by propulsion of jet? Describe the different devices for propulsion.

How is compression done in ramjet? Explain in brief.

A turbojet engine flying at a speed of 830 km/hr consumes air at the rate of 42 kg/s. Calculate: (i) Jet exit velocity; the enthalpy changes for nozzle is 190 kJ/kg and the velocity coefficient is 0.92. (ii) Flow rate of fuel considering air-fuel ratio is 85. (iii) Propulsion power.

How turbofan engine are aerodynamically more efficient than turbo propeller engines? How energy produced from turbines are distributed in these engines?

Differentiate between ramjet and rocket. Enlist the advantages of ramjet.

An engine with turbojet is flying at a speed of 920 km/hr. It consumes air with a rate of 45 kg/s. Calculate (i) the exit velocity for enthalpy changes in the nozzle 180 kJ/kg, (ii) the flow rate of fuel when A/F ratio is 80, (iii) thermal efficiency for fuel with heating value of 45 MJ/kg.

What is meant by propulsion? Differentiate between ramjet and rocket propulsion system.

A turbojet engine flying at a speed of $800\text{ Km/hr}$ consumes air at the rate of $45\text{ kg/s}$. Calculate:
i) jet exit velocity if the enthalpy change for the nozzle is $168\text{ kJ/kg}$.
ii) flow rate of fuel, assuming air-fuel ratio is 80
iii) the thermal efficiency of the plant, given calorific value of fuel used is $41750\text{ kJ/kg}$
iv) Propulsion power
v) Propulsive efficiency