2015年5月13日 · N1 and N2 are the rotational speeds of the engine sections expressed as a percentage of a nominal value. It is similar to the revolutions per minute (RPM) of a piston engine, expressed in percentage instead of in the actual rate of rotation. They are different because they are characteristic on two-spool engines (see the figure below). The first spool is the low pressure compressor (LP), that ...

2022年6月16日 · The N2 shaft is the actual jet engine proper, which has one job: turn fuel into thrust directly. It is akin to the crankshaft on a gas/diesel engine. The N1 shaft is an extra turbine put in the thrust stream so it can steal thrust and turn it into rotating shaft power. It is akin to the transmission shaft on a car, or the Power Takeoff on a tractor. So when you are starting a …

2006年9月5日 · N1 is the first spool in the engine, for airliners this is the fan in the front. N2 is the core compressor spool. Some Rolls Royce engines have a second core spool, known as N3.

N1 or N2 show the percentage of rpm for the respective shaft. Each engine has a particular number of rpm corresponding to 100% N1 or N2 in order to make numbers easier to understand for pilots between different engines.

2001年4月12日 · N2 is the turbine inside the engine and N3 is a turbine further in the core of the engine. When the engine is started N2 starts to turn which drives N1 and one can see the % increases on the EICAS screens in the cockpit.

2015年5月13日 · N1 and N2 seem to be derived from both. Wikipedia mentions the speed as a percentage paradigm as a human factors consideration, though as of 5/14/2015 there are no references to support this. However, there may be a scientific basis behind this as well, since a change in N is proportional to the resultant change in airflow (i.e. thrust produced):

2016年1月21日 · How the N1 and N2 (N3 in RR some engines) calculated in a gas turbine engine? Do they accomodate an iquipment like a Tachogenerator? Some one please explain

Parameters are EGT, Fuel Flow, N1, N2 and Air Temperature. For now, I've understood this: Temperature increases, EGT increases. Temperature increases, Fuel Flow increases. N2 decreases, Fuel Flow increases. (src - What does it mean for N1/N2 to float?) Can you guys please give me more insight like the ones above? Also, please correct my mistakes.

2017年4月13日 · N1, N2, and N3—each shaft is given a number, in a single-spool there'll just be a single RPM readout. To run the fan even more efficiently, enter the geared turbofan, where the fan is slowed even further using a reduction gearbox, allowing for an even bigger fan that runs slower—and quieter.

2018年1月17日 · N1 is driven by the starter flow through windmilling. N2 is started through a gearbox as described in this answer, driven by an air starter or by an electric motor. This causes air to start flowing through the engine, and the LP turbine blades pick up energy from this airflow. Above graph is from The Jet Engine by Rolls Royce, and shows that the LP spool (N1) starts to turn in the dry cranking ...