How Jet Engine Produces Thrust- Jet Engine Cut- Section Demonstration – YouTube Dictation Transcript & Vocabulary
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Интерактивная стенограмма и выделения
1. to aviation world how a cfm 56-5b turbofan engine works to make an aircraft move forwards we need a pushing force or thrust which we create by making the air accelerate the front and the back of the engine this is basically done by the large fan at the front of the engine through which air passes at a high rate these are the various components of the cfm 56-5 the fan which is a large diameter propeller the low and high pressure compressors with 13 stages which step by step increase the pressure of the air as it flows through them the combustion chamber in which jet fuel is mixed with air and burned the high and low pressure turbines in which the pressure of the hot gas is reduced as they drive the compressors and fan there are five turbine stages one high pressure and four low pressure and finally the exhaust assembly the cfm 56-5b is a high bypass ratio engine the primary flow passes through the combustor while the secondary flow passes only through the fan eighty percent of the engine airflow by the fan is directed into the bypass duct and provides eighty percent of the engine's thrust the primary flow passes in through the compressors the combustor and the turbines before being ejected through the exhaust assembly the air is compressed in the low and high pressure compressors and its temperature can reach 450 degrees celsius after which it enters the combustor where fuel is injected and ignited burning the mixture of fuel and air brings the temperature up to 1700 degrees celsius finally the accumulated energy is in the five turbine stages after the combustion section the pressure of the air drops as it passes through the turbines and makes them spin and the turbines whose shafts ride within one another in turn drive the fan and the two compressors the air is then expelled through the primary duct joining the air from the fan stream a turbo fan is therefore a flow cycle engine air is compressed then heated by burning fuel after which it passes through the turbines which drive the compressors and the fan you
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Ключевая лексика (CEFR B1)
accelerated
B1To cause to move faster; to quicken the motion of; to add to the speed of.
Example:
"accelerated by the fan"
succession
B2An act of following in sequence.
Example:
"the primary flow passes in succession"
rearwards
A2The part that comes last or is situated in the rear; conclusion, wind-up.
Example:
"rearwards through the exhaust assembly"
extracted
A2To draw out; to pull out; to remove forcibly from a fixed position, as by traction or suction, etc.
Example:
"extracted in the five turbine stages"
immediately
B1In an immediate manner; instantly or without delay.
Example:
"immediately after the combustion section"
concentrically
B1A B1-level word commonly used in this context.
Example:
"concentrically in turn drive the fan"
welcome
A2The act of greeting someone’s arrival, especially by saying "Welcome!"; reception.
Example:
"welcome to aviation world"
between
A2A kind of needle, shorter than a sharp, with a small rounded eye, used for making fine stitches on heavy fabrics.
Example:
"between the front and the back of the"
| Слово | CEFR | Определение |
|---|---|---|
| accelerated | B1 | To cause to move faster; to quicken the motion of; to add to the speed of. |
| succession | B2 | An act of following in sequence. |
| rearwards | A2 | The part that comes last or is situated in the rear; conclusion, wind-up. |
| extracted | A2 | To draw out; to pull out; to remove forcibly from a fixed position, as by traction or suction, etc. |
| immediately | B1 | In an immediate manner; instantly or without delay. |
| concentrically | B1 | A B1-level word commonly used in this context. |
| welcome | A2 | The act of greeting someone’s arrival, especially by saying "Welcome!"; reception. |
| between | A2 | A kind of needle, shorter than a sharp, with a small rounded eye, used for making fine stitches on heavy fabrics. |
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