What is a twin spool turbofan?

What is a twin spool turbofan?

A two-spool engine has two concentric shafts that rotate at different speeds: one connects the high-pressure turbine stages to the high-pressure compressor, and the other connects the low-pressure turbine stages to the low-pressure compressor and fan.

What is a twin spool gas turbine?

A twin spool design normally has the front compressors attached to the rear turbines using an inner shaft, with a higher pressure compressor and a higher pressure turbine connected with an outer shaft.

What is a dual spool?

In a dual-spool engine, the compressor and high-pressure turbine are both split into two segments. Each compressor segment is driven by its corresponding turbine using two separate drive shafts, with one inside the other.

What is a dual spool gas turbine engine?

An axial-flow turbine engine with two independent axial-flow compressors, each driven by its own stage(s) of turbines. The high-pressure, or N2, compressor is speed governed by the fuel control system.

Are turbojets still used?

Turbojets were used on Concorde and the longer-range versions of the TU-144 which were required to spend a long period travelling supersonically. Turbojets are still common in medium range cruise missiles, due to their high exhaust speed, small frontal area, and relative simplicity.

What RPM does a jet engine run at?

For example, large jet engines operate around 10,000–25,000 rpm, while micro turbines spin as fast as 500,000 rpm.

What does a nozzle do in a jet engine?

All gas turbine engines have a nozzle to produce thrust, to conduct the exhaust gases back to the free stream, and to set the mass flow rate through the engine. The nozzle sits downstream of the power turbine. A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow.

What is the purpose of the diffuser section in a turbine engine?

Diffuser is one key component of the gas turbine combustor following the compressor. Its primary function is to slow down the air flow delivered by the compressor in order to promote efficient combustion and avoid large total pressure losses.