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).
Proposal for experiments on fluid discharge through various orifices to measure flow variation with length and cross-sectional area.
| Identifier | ExFiles\Box 36\1\ scan 029 | |
| Date | 31th March 1917 | |
| -2- EFC1/AT31.3.17. Contd. We are a little bit uncertain as to the exact lengths and bores to make these, and we would like you to say what lengths and bores would best suit your purpose as regards the experimental results we shall obtain with them. You will appreciate that by making use of these nine orifices we shall be enabled to draw out six curves (3 points on each curve), three of which will show the variation of discharge with cross sectional area for each of three given lengths, and three of which will show the variation of discharge with length for each of three given cross sectional areas. We shall use these orifices as sharp edged orifices in the first instance, afterwards we shall have their inlet ends rounded off to vena contracta form (as per following sketch) to reduce as far as possible the loss of head at entry. We propose to make use of a tank of petrol, the head of which above the orifice we can easily vary, and to measure the discharge of each orifice by collecting it in a glass measuring vessel. It would probably be worth while at the same time to find the variation of discharge with head, by taking three different heads for each orifice. We think the above results, since they could (Contd) | ||