NIFE Engines 2024 Questions and Answers Rated A+

NIFE Engines 2024 Questions and Answers Rated A+ EXPLAIN Bernoulli's Equation, given dynamic pressure, static pressure, and total pressure Bernoulli's equation stats Pt=Pdynamic+Pstatic. As any incompressible fluid passes through a convergent opening its velocity increases and pressure decreases. Describe Airflow in a nozzle When Pressure is decreased and velocity is increased Subsonic: Diverging nozzle=increased pressure, decreased velocity converging: opposite Super sonic: Diverging=increased velocity and decreased pressure converging=opposite. Describe airflow in a diffuser When Pressure is increased and velocity is decreased Subsonic: Diverging nozzle=increased pressure, decreased velocity converging: opposite Super sonic: Diverging=increased velocity and decreased pressure converging=opposite. Incompressible Airflow vs compressible air flow Incompressible: subsonic compressible: supersonic. Describe a gas generator A gas generator produces the high energy airflow necessary for creating thrust. All Gas Generators have: compressor, combustion chamber and turbine at minimum. On turbofan, turboprop and turboshaft it will include the fan blade. Describe brayton cycle Intake, compression, combustion and exhaust. These are all occurring simultaneously. Describe the otto cycle The otto cycle consists of intake, compression, combustion and exhaust, however it differs from the Brayton cycle because these events occur sequentially rather than simultaneously. Describe how airflow properties change through each section of the gas turbine engine Temperature: Temperature steadily increases due to compression until it leaves the burner, when it is at its maximum. then decreases. Pressure: pressure is increased until it exits the diffuser, where it dips slightly during ignition and begins to rapidly drop off through the turbine and exhaust Velocity: velocity dips slightly through the inlet and begins to increase at the compressor. At the diffusor it dips again to aid in fuel air mixing, and then rapidly accelerates through the burner, turbine and exhaust section. What is engine thrust Engine thrust is described in either gross thrust or net thrust Gross thrust: measurement of thrust due solely from the velocity of exhaust gases Net thrust: Thrust that corrects for the effect of inlet