CONVERGENT / DIVERGENT DUCTS 8083-32a pgs 3-24 to 3-31

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Across
  1. 3. Which principle is used in the compressor and diffuser where the air is slowing and pressurizing. Con/Divergent?
  2. 6. Which principle is usually used for the exhaust nozzle. Con/Divergent?
  3. 7. The divergent section handles the gases, further increasing their velocity, after they emerge from the throat and become supersonic. As the gas flows from the throat of the nozzle, it becomes supersonic (Mach 1 and above) and then passes into the divergent section of the nozzle. Since it is supersonic, it continues to increase in velocity on these type vehicles.
  4. 9. A duct that has an increased cross-sectional area in the direction of flow.
  5. 13. The exhaust gases flow into this component of the exhaust nozzle where the flow is restricted by a smaller outlet opening. Here the gas velocity is increased providing increased thrust.
  6. 14. Airflow is controlled and dropped to subsonic speeds before entering the engine by this duct.
  7. 15. The advantage of a convergent-divergent nozzle is greatest at high Mach numbers because of the resulting higher pressure ratio across the engine exhaust nozzle.
  8. 17. The Exhaust Section is a XX duct, converts the expanding volume & decreasing pressure of gas to final high velocity.
  9. 18. This component is critical to thrust performance. Adjusting the area of the XX changes both the engine performance and the exhaust gas temperature.
  10. 19. To ensure that a constant weight or volume of a gas flows past any given point after sonic velocity is reached, the XX of a supersonic exhaust duct.
Down
  1. 1. The exhaust nozzle acts as an XX, the size of which determines the density and velocity of the gases as they emerge from the engine.
  2. 2. Whenever the engine pressure ratio is high enough to produce exhaust gas velocities which might exceed Mach 1 at the engine exhaust nozzle, more thrust can be gained by using a this type of nozzle.
  3. 4. A series of stator vanes immediately ahead of the first-stage turbine. The function of the inlet guide vanes is to divert the hot gases in the proper direction to enter the turbine, and to provide a series of convergent ducts which increase the velocity of the gases.
  4. 5. This section of the CDNozzle exhaust duct is enlarged to accommodate the additional weight or volume of a gas that flows at supersonic rates to ensure the nozzle operates efficiently.
  5. 8. Type Inlets are used to slow the incoming air to less than MACH1 before entering the engine.
  6. 10. The very first part of the section which it, and the exhaust plug, result in a reduction in exiting airflow turbulence.
  7. 11. A duct that has a decreasing cross section in the direction of flow (convergent) until a minimum area is reached. After this point, the cross section increases (divergent). Convergent-divergent ducts are called CD ducts or con-di ducts.
  8. 12. Used to help produce more thrust when exhaust gas velocities are greater than Mach 1.
  9. 16. A duct that has a decreasing cross section in the direction of flow.