What is turboshaft engine used for?

A turboshaft engine is a variant of a jet engine that has been optimised to produce shaft power to drive machinery instead of producing thrust. Turboshaft engines are most commonly used in applications that require a small, but powerful, light weight engine, inclusive of helicopters and auxiliary power units.

How much does a turboshaft engine cost?

Rolls-Royce M250 Turboshaft

Engine Type: Turboshaft Engine
Applications: MQ-8B Fire Scout OH-58D Kiowa Warrior
Status: In Production
Manufacturer: Rolls-Royce plc
Price/Unit Cost: $265,600 to $323,400

What is the principle of turboshaft engine?

Turboshafts are an adaptation of gas turbine technology in which the principle output is shaft power from the expansion of hot gas through the turbine, rather than thrust from the exhaust of these gases.

Why are most turboshaft engines free power turbines?

The advantage of the free turbine is that the two turbines can operate at different speeds, and that these speeds can vary relative to each other. This is particularly advantageous for varying loads, such as turboprop engines.

Why are turbofans quieter than turbojets?

Turbofan engines are inherently quieter than turbojets for a given level of thrust. Turbojet thrust is developed solely by the turbine engine. Therefore, for a given thrust, the fanjet’s discharge contains less energy (but more mass) as it exits the engine, and so produces less noise.

Why is a turbofan better than a turbojet?

Low-bypass-ratio turbofans are more fuel efficient than the basic turbojet. A turbofan generates more thrust for nearly an equal amount of fuel used by the core because the fuel flow rate is changed by slightly when adding the fan. As a result, the turbofan offers high fuel efficiency.

How long does a helicopter engine last?

When is helicopter engine maintenance required? For scheduled maintenance, most turboshaft engines offer times between overhaul (TBOs) ranging from 3,500hrs to 5,000hrs. While the TBO is a recommended interval for FAR Part 91 private flying, for Part 135 passenger-carrying and cargo charter operations it is mandatory.

What drives the fan in a turbofan engine?

A turbofan engine, sometimes referred to as a fanjet or bypass engine, is a jet engine variant which produces thrust using a combination of jet core efflux and bypass air which has been accelerated by a ducted fan that is driven by the jet core. This is necessary as the low pressure turbine also powers the fan.

Is turboprop jet engine?

The main difference between a turboprop and a jet is that a turboprop is a jet engine turning a propeller. Turboprops are a hybrid of jet engines and the more traditional piston engine propeller that you see on smaller, lightweight airplanes. This does not mean turboprops are slow or fly low compared to jets, however.

What planes use turboprop engines?

Turboprop Aircraft

  • Cessna.
  • Beechcraft.
  • Piaggio.
  • Piper.
  • Pilatus.
  • Socata.

Can turbofans go supersonic?

Turbofans can tolerate supersonic speeds because the intake creates constant flow conditions irrespective of flight speed. Efficiency for propellers and fan blades is highest at subsonic flow conditions.

What makes a free-turbine turboshaft a turboprop?

A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by a separate turbine, downstream of the gas turbine and is not connected to the gas turbine (the exhaust airflow is what spins the turbine that is connected to the shaft hence the term “free”).

Why are turboshaft engines used in helicopter engines?

Helicopters are a major market for turboshaft engines. When turboshaft engines became available in the 1950s, they were rapidly adopted for both new designs and as replacements for piston engines. They offered more power and far better power to weight ratios.

How is a turbo engine similar to a jet engine?

A turboshaft engine is a form of gas turbine that is optimized to produce shaft power rather than jet thrust . In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust and convert it into output shaft power.

Which is the primary component of a turbogen system?

The primary component of TurboGen™ is a self-contained turboshaft engine. The engines mechanically-free power turbine drives an electric generator. The system is expressly designed for energy conversion research and education.