what happens at the expansion jet
Answers
Explanation:
The present paper discusses topics pertinent to the freely expanding jet and presents results of a jet-plume experiment using a normal flat plate and streamline direction vanes. A direct comparison of the method of characteristics solutions with measurements is made to determine the importance of deviations from ideal gas behavior. Departure of the real physical situation from the assumed ideal gas conditions can be caused by condensation in the nozzle and flow field, viscous effects, rarefaction of the flow, and freezing of the internal energy modes.
The argon and nitrogen jets from nozzles with area ratios=1.0 to 207 were mapped by means of the force on a flat plate normal to the flow direction and streamline vanes.
Conclusions are drawn relative to the applicability of the ideal gas method of characteristics results to the determination of the properties of ajet exhausting into a near vacuum. It is concluded that:
o
1.
1.At high nozzle-chamber pressures, the transition from a continuum to a free molecular state will result in a density field nearly the same as given by the method of characteristics.
2.
2.The flow fields tested became source-like early in the expansion.
3.
3.The normal flat plate is a useful tool for rarefied flow investigations since it provides a direct measurement of momentum flux.
Answerd By Lakshita Kumar.