Description
(Product number: S211)
The S211 Steam Turbine Module is compact and incorporates a small axial flow impulse steam turbine, a water cooled friction brake, a water cooled condenser and all the necessary controls and instrumentation. It is designed to be connected to the S201 from which it obtains its supply of steam and to which it rejects air and condensate. Together the S201 and S211 form a Complete Rankine Cycle Steam turbine with sub-atmospheric condenser.
Steam from the S201 Steam Generator and Service Module enters through the left-hand end face, passing through a solenoid valve and a throttle valve before entering the turbine nozzle.
The turbine shaft is mounted vertically and runs in sealed ball bearings. It is fitted with a gland to reduce the ingress of air when the turbine is exhausting below atmospheric pressure. The turbine rotor is positioned at the lower end of the shaft and the brake is at the upper end.
The turbine is of the single stage, axial flow impulse (De Laval) type and has a single convergent-divergent nozzle to expand the steam. After passing through the rotor blades the steam flows directly into a glass walled water cooled condenser.
At the bottom of the condenser is a diverter valve which has two positions. In one position both air and condensate from the turbine condenser are returned to the dump condenser of the S201. In the other position, air only is returned to the S201 and the condensate is retained in the turbine condenser. In this way the steam consumption of the turbine may be measured directly by volume.
The brake drum at the upper end of the shaft runs against a belt which is tensioned by a pulley moved by the load adjuster to vary the frictional resistance. The frictional force is measured by a load cell and is displayed by a digital meter on the panel. Water for cooling the brake drum is supplied to a fitting at the top of the shaft and is later collected and drained away as it leaves the periphery of the drum.
An optical sensor senses the rotational speed of the turbine and this is displayed by a digital tachometer on the panel.
