Topic
Ogee
About: Ogee is a research topic. Over the lifetime, 51 publications have been published within this topic receiving 169 citations.
Papers published on a yearly basis
Papers
TL;DR: In this article, the hydraulics of ogee structure under hydraulic heads near the design head were investigated and an ogee spillway is one of the most common types of the spillway.
Abstract: Ogee spillway is one of the most common types of the spillway. Researchers have attempted to investigate the hydraulics of ogee structure under hydraulic heads near the design head. Herein, an ogee...
38 citations
1 Oct 1977
TL;DR: In this paper, the effect of the Ogee tip on helicopter rotor acoustics, performance, and loads was investigated at the Langley whirl tower and a UH-1H helicopter.
Abstract: Full-scale tests were utilized to investigate the effect of the Ogee tip on helicopter rotor acoustics, performance, and loads. Two facilities were used for this study: the Langley whirl tower and a UH-1H helicopter. The test matrix for hover on the whirl tower involved thrust values from 0 to 44,480 N (10,000 lbs) at several tip Mach numbers for both standard and Ogee rotors. The full-scale testing on the UH-1H encompassed the major portion of the flight envelope for that aircraft. Both near-field acoustic measurements as well as far-field flyover data were obtained for both the Ogee and standard rotors. Data analysis of the whirl-tower test shows that the Ogee tip does significantly diffuse the tip vortex while providing some improvement in hover performance. Flight testing of both rotors indicates that the strong impulsive noise signature of the standard rotor can be reduced with the Ogee rotor. Forward flight performance was significantly improved with the Ogee configuration for a large number of flight conditions. Further, rotor control loads and vibrations were reduced through use of this advanced tip rotor.
10 citations
1 May 2018
TL;DR: In this article, the authors investigated the effect on the flow characteristics of the upstream quadrant shape of four ogee spillways at high head operation by means of experimental modelling and found that the discharge coefficient continuously increases until a head ratio of 5.5 and then drops due to a flow separation at the spillway crest.
Abstract: The effect on the flow characteristics of the upstream quadrant shape of four ogee spillways is investigated at high head operation by means of experimental modelling. Each spillway is designed following the latest recommendations of the U.S. Army Corps of Engineers. The upstream and downstream quadrants of the reference spillway have the same design head. The absence of scale-effects is verified with a second reference spillway designed with a smaller head. The last spillway has an upstream quadrant with a design head respectively larger and smaller than the one of the downstream quadrant. The discharge coefficient is evaluated until head ratios of five for each case and until seven for the smaller model. The discharge coefficient continuously increases until a head ratio of 5.5 and then drops due to a flow separation at the spillway crest. The spillway efficiency (discharge coefficient) reduces with an oversized upstream quadrant while an undersized quadrant has no effect, but it does affect the measured relative pressure and thus the risk of cavitation.
10 citations
1 Dec 1965
TL;DR: In this paper, flight and wind tunnel tests of low speed characteristics of delta wing aircraft modified to Ogee plan form were conducted for the first time in the Ogee-Ogee project.
Abstract: Flight and wind tunnel tests of low speed characteristics of delta wing aircraft modified to Ogee plan form
9 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2019 | 4 |
| 2018 | 2 |
| 2016 | 1 |
| 2015 | 1 |