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
Given data for an F-4 (W=40000 lb, S=530 ft^2, Ta@sea level=35800 lb, Mach=1.5, h=20000 ft (std day), Cd0=.0224, k=.1516) find aircraft''s specific excess power in straight-and-lev

how does the Ip message finally reassemble?

Why Industries that manufacture racing cars prefers nickel based alloys for engine components and iron based alloys for structural parts?

1. The cantilever beam-like structure shown below is modeled using a 2 x 10 mesh of rectangular four-node plane stress elements of equal size. Geometric boundary conditions at x ?

Propeller pitch control: Before looking at propeller pitch control an understanding of the relationship between the 'Power Lever' and the 'RPM (condition / speed) Lever' with r

Navigation Systems  • Traditional guidance systems used mechanical gyroscopes (rate gyros) to measure the angular velocities of the vehicle or of the gimbals on which the seeke


OIL PUMPS The oil pumps fitted in a recirculatory system are normally gear-type or Gerotor type pumps. The pumps are usually mounted in a pack containing one pressure pump and

why shift variant system causes artifacts

calculate inventory turnover ratio, when only given current assets $100,000, current liabilities, $25,000 sales $200,000 and quick ratio=1.5