On the scaling of air layer drag reduction
Web16 de mar. de 2024 · Cavitating flow near free surface is a complicated issue and may provide new inspiration on high-speed surface cruising. This study observes stable supercavitating flow as a new phenomenon in a launch experiment of axisymmetric projectile when the upper side of the projectile coincides with the free surface. Web20 de mai. de 2024 · Abstract The correlation between drag variation and rear surface pressure of an Ahmed body with a slant angle of 25° is experimentally studied. The body is forced with several independent steady blowings deployed around the rear window and the vertical base. Several combinations of the independent blowings are investigated, which …
On the scaling of air layer drag reduction
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WebA set of experiments have been conducted at the US Navy's Large Cavitation Channel to investigate skin-friction drag reduction with the injection of air into a high Reynolds … Web11 de abr. de 2024 · Drag increases in excess of 10% were observed for the highest rain rate tested, which represented an unrealistically-high precipitation condition equivalent to about 250 mm/hr full scale. A non ...
WebDrag Reduction in a Homogeneous Flow. Keizo Watanabe, in Drag Reduction of Complex Mixtures, 2024. Abstract. Drag reduction phenomenon in not only an internal flow but also an external flow is shown experimentally by comparison of that of Newtonian fluids. It is presented that the trend of the drag reduction of a sphere is quite similar to dilute … Web22 de nov. de 2010 · Several large scale experiments have been conducted at the US Navy's Large Cavitation Channel on a 12.9 m long flat plate model investigating bubble …
Web15 de jan. de 2024 · Because of the slip effect, vortices and shears in the turbulent boundary layer were restrained, and a drag reduction up to 20% was obtained in the study. This … Web10 de abr. de 2024 · Superhydrophobic surfaces could repel water due to the capillary force associated with surface roughness, which has a large range of applications, such as underwater drag reduction, heat transfer enhancement, oil/water separation, and so on. However, the engineering applications of superhydrophobic surfaces rely on the stability …
Web1 de jul. de 2015 · Two distinct drag-reduction phenomena were investigated: bubble drag reduction (BDR) and air-layer drag reduction (ALDR). Results from the BDR experiments indicate that significant drag reduction (>25%) is limited to the first few meters downstream of injection. Once ALDR was established, friction drag reduction in excess of 80% was …
Webadshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A nothing in scalaWeb1 de fev. de 2013 · Abstract Air-induced drag reduction was investigated on a 12.9 m long flat plate test model at a free stream speed of $6. 3~\\mathrm{m} ~{\\mathrm{s} }^{- 1} $ . … nothing in registerWeb1 de mai. de 2024 · In addition, once ALDR was established: friction drag reduction in excess of 80% was observed over the entire smooth model for speeds to 15.3 m s(-1); the critical volumetric flux of air required ... how to set up microsoft authenticatorWebShown in figure 23 are the results for qcrit and qtrans from the primary experiment without surfactant in the background that define the transition between drag-reduction regimes. 3.3.2. Scaling of air-layer drag reduction The gas injection-rate thresholds are observed to be influenced strongly by the free-stream velocity, as observed in figure ... nothing in site or sightWeb1 de abr. de 2024 · Basin by Jang et al., (2014). Jang et al was interested in ALDR and compared transitional air layer drag reduction and air layer drag reduction on both flat plate and bulk carrier models. The net power saving from ALDR was estimated to be approximately 5-6%. how to set up microphone windows10Web10 de out. de 2008 · Drag reduction was achieved by injecting gas (air) from a line source through the wall of a nearly zero-pressure-gradient TBL that formed on a flat-plate test … how to set up microphone with headphone jackWebWhen implemented at relatively low or high gas fluxes, this air-injection method is termed bubble drag reduction (BDR) and air layer drag reduction (ALDR), respectively. While the majority of studies to date … nothing in spanish meaning