Steam passes from the inlet chamber, through the test nozzle, into the exhaust chamber and finally into the surface condenser via a back pressure control valve. Nozzle Steam Bench consists of a sturdy framework and panels of all steel construction, fitted with a student work surface, interconnecting back panel and adjustable feet. Steam supply to the inlet chamber first passes through a steam separator to remove excess water content and the chamber is fitted with a throttling facility to enable the dryness of the inlet steam to be determined. The steam chest consists of an inlet chamber and an exhaust chamber with a test nozzle positioned in the wall common to the two chambers.
Experimental Capability:
Determination of critical pressure ratio for choked flow
Calculation of velocity through length of nozzles of various forms
The variation of pressure along a nozzle profile as a function of back pressure
The effect of back pressure on the mass rate of flow
Measurement of state at entry to the nozzle and subsequent calculation
A comparison of theoretical and actual throat pressures on rates of flow
Study of shock wave formation within nozzle divergence and at nozzle outlet
Study of the effects of friction in a parallel nozzle.
