specific thrust

The situation is completely reversed for a high (dry) specific thrust.

The specific thrust is the propulsion force divided by the energy used.

A high specific thrust usually results in higher noise levels, which is not an important consideration for most military applications.

This low specific thrust is usually achieved with a high bypass ratio.

Designers normally have to make a compromise on specific thrust of the engine.

Dry specific thrust has impact upon the performance of afterburning turbofans.

However, a larger fan is required, to keep the specific thrust low enough to satisfy jet noise considerations.

Nevertheless, the afterburning specific thrust is still relatively low.

Also the fan pressure ratio is relatively high, to achieve a medium to high specific thrust.

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Rearranging the above equation, specific thrust is given by:

Low specific thrust is achieved by replacing the multi-stage fan with a single-stage unit.

On military engines, the fan pressure ratio would probably be increased to improve specific thrust, jet noise not normally being an important factor.

Supersonic aircraft require a high specific thrust, since that gives a high exhaust speed.

So for zero flight velocity, specific thrust is directly proportional to jet velocity.

Only a single fan stage is required, because a low specific thrust implies a low fan pressure ratio.

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The impact of thrust lapse rate upon a low specific thrust (e.g., civil) engine is even more severe.

To meet the requirement for high specific thrust for supercruising, the design would have very high core temperature.

Owing to the low specific thrust, the bypass ratio for the engine is higher than normal for a military turbofan.

Consequently engine designers must select a level of dry specific thrust that is suitable for the engine application.

Because modern civil turbofans operate at low specific thrust, they only require a single fan stage to develop the required fan pressure ratio.

A very low specific thrust (i.e. very high bypass ratio) turbofan is proposed for the aircraft.

Additionally a low specific thrust implies that the engine is relatively large in diameter, for the net thrust it produces.

Apart from developing training manpower and technical services for plastics industries, each centre has been entrusted with a specific thrust area for development.