Sonic airflow - aircraft maintenance, Other Engineering

Sonic airflow though divergent and convergent ducts

When a flow of fluid (i.e. gas) flows at sonic speed through a convergent duct a shock wave forms at the exit area of the duct - The exit area is said to be choked. The shock wave forms a restriction to the fluid and pressure will increase, temperature will increase and velocity will decrease.

735_sonic airflow.png

When a gas flow reaches sonic velocity in a convergent duct the nozzle will choke and the pressure will increase. To prevent a pressure rise that would eventually prevent a 'fluid' flow and completely choke the duct a divergent section is added making the duct convergent/divergent (Con/DI). The pressure of gas released into the divergent section of the nozzle causes the velocity of the 'fluid' to increase, pressure to decrease, and therefore temperature to decrease. Gas pressure acts on the walls of the divergent section, this pressure gives additional thrust that is known as pressure thrust.

1834_sonic airflow1.png

Posted Date: 9/11/2012 7:22:52 AM | Location : United States







Related Discussions:- Sonic airflow - aircraft maintenance, Assignment Help, Ask Question on Sonic airflow - aircraft maintenance, Get Answer, Expert's Help, Sonic airflow - aircraft maintenance Discussions

Write discussion on Sonic airflow - aircraft maintenance
Your posts are moderated
Related Questions


a note on tracing a closed loop. What are the characteristic features of a closed loop?(

determine the ash content in given sample

Primed stability derivatives The rolling and yawing motions are coupled through the cross inertia I XZ due to rotation not being about the principal axes. Since in general air

At a machine tool plant, five jobs must be completed each day. The time it takes to do each job depends on the machine used to do the job. If a machine is used at all, there is a s

Control Surfaces  As with a flight control system, a guidance algorithm uses control surfaces to control the behaviour of an airframe.         - Rudder, ailerons, elev


Electron Microscope The development of the electron microscope was based on theoretical work done by Louis De Broglie, who found that wavelength is inversely proportional to mo