25. A turbojet engine gets most of its thrust from an airflow that bypasses the combustor...

25. A turbojet engine gets most of its thrust from an airflow that bypasses the combustor and turbine sections. a. True b. False

26. A turboprop engine gets most of its thrust from an airflow that bypasses the combustor and turbine sections. a. True b. False

27. In a gas turbine engine for aircraft applications, a diffuser is needed at the inlet to … a. Reduce the speed of the air entering the compressor section to near zero relative to the compressor air intake. b. Reduce the pressure of the air entering the compressor. c. Increase the temperature of the air entering the compressor. d. Reduce heat transfer from the air to the surroundings, as this heat will be of value in the engine.

Expert Solution

25) (a) True

In the turbojet engine, most of the thrust(nearly all the thrust) is produced by ejecting a high energy gas stream from the engine exhaust nozzle. That is the airflow which is passed through the compressor and the turbine is the main source of thrust in turbojet engines.

26) (b) False

In a turboprop engine, the turbine is connected to an additional drive shaft which passes through the core shaft, and this shaft is connected to a gearbox. The gearbox is further connected to the propeller. The propeller is the one that produces most of the thrust in a turboprop engine. The gearbox and an additional turbine generally helps in increasing the overall thrust that can be developed by the turboprop engines.

27) (a) Reduce the speed of the air entering the compressor section to near zero relative to the compressor air intake.

The diffuser is one of the key components of the gas turbine combustor. Its main function is to slow down the airflow that is delivered by the compressor to the combustor. This helps in efficient combustion and avoiding large pressure losses in total. It also helps to reduce flow losses in the process of combustion. Slower air also helps in stabilizing the combustion flame.

samet mamat answered 4 months ago

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