From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The design and testing of an 'introverter' deflector for improving induction mixture spray.
| Identifier | ExFiles\Box 179\2\ img181 | |
| Date | 22th January 1932 | |
| -3- inclined as in fig.1. This was partly effective; spray could be seen issuing from the discharge at the centre of the main pipe, but the peripheral embrace of the scoop is not sufficient for it to deal with all the dense spray on the walls. In the endeavour to obtain a wide peripheral embrace this led to the scheme shown in fig.3 which in fact scoops the entire wall virtually turning the induction mixture inside out. This deflector or "introverter" as it might be styled, is made from sheet aluminium in our experimental model. It may be imagined as being formed from a cone whose large end is considerably bigger than the diameter of the induction pipe while the small end is 2" or so in diameter. The large end is then flattened until instead of being circular, it is a narrow slot whose area is about equal to that of the small end. This slot is then bent into a circle about the original axis of the cone, forming an annular opening which will just fit into the induction pipe while the small end of the cone into which it merges remains circular and is situated in the centre of the induction pipe pointing forward. Thus the whole periphery of the induction pipe is scooped and the mixture brought to the centre while the remaining flow gradually transfers to the outside of the cone. Fig.4 gives two perspective views of the deflector not fitted inside the sleeve. On test this device successfully scooped the water and delivered it from the central discharge orifice. Moreover it was equally effective at low speeds, when instead of coming from the top of the blower elbow the liquid tends to collect in a puddle at the bottom. This was picked up and discharged at the centre. As a check on the back pressure, a water column was connected to the blower elbow and the pressure, atmospheric above noted. It was about the same as with the standard re-distributor but in a final design of the same length, we think could be made definitely less. With a greater length available as with a revised induction pipe having the ports further from the blower, a much smaller back pressure could be obtained and greater liberty could be taken in proportioning the orifices. The "introverter" does not make distribution even, but delivers the liquid into or near the centre of the pipe. The remainder of the flow is a fairly even cloud of vapour. A | ||