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https://hdl.handle.net/11681/21422| Title: | Entrances to conduits of rectangular cross section. Report 2, Investigation of entrances flared in three directions and in one direction |
| Authors: | U.S. Army Engineer Waterways Experiment Station |
| Keywords: | Hydraulic models Cavitation |
| Publisher: | U.S. Army Engineer Waterways Experiment Station Engineer Research and Development Center (U.S.) |
| Description: | Technical memorandum Tests of conduit entrances flared in three directions and in one direction were conducted to develop entrance shapes which would not be damaged by cavitation and yet would be as small as possible in cross section. Pressure measurements were made on a transparent conduit, 0.283 ft wide by 0.500 ft high by 8.64 ft long, connected to a steel pressure headbay tank. Test results indicate that pressure conditions probably acceptable for most installations can be obtained by the use of elliptical entrance curves with the minor axis equal to one-third the major axis. For entrances flared in three directions, the major axes for the entrance curves should be equal to the dimensions of the conduit proper in the directions concerned. For an entrance in which only the top is flared, the major axis of the entrance curve should be equal to at least 1.5 times the depth of the conduit proper. At installations where high heads and little back pressure result in hydraulic conditions highly susceptible to cavitation, an entrance formed by a compound elliptical curve is desirable. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/21422 |
| Appears in Collections: | Technical Memorandum |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| WES-Technical-Memorandum-No.2-428-Report-2.pdf | 1.94 MB | Adobe PDF |  View/Open |