Flow laminarization
WebFIELD: aeronautical engineering; boundary layer control devices. SUBSTANCE: laminarization of boundary layer is effected due to finned surface provided in nonlinear area of laminar-turbulent transition on straight wing and in area of destruction of determined stationary vortices on yawing wing. Fins of surface are located along direction of local flow. WebJul 7, 2011 · Laminar-flow control is a technology that offers the potential for improvements in aircraft fuel usage, range or endurance that far exceed any known single aeronautical technology. ... end of the program,38 flights attained laminar flow on a fairly large airplane over 95 percent of the area intended for laminarization. Unfortunately, top ...
Flow laminarization
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WebJun 28, 2012 · Flow laminarization may occur, and in that event heat transfer rates may be as low as 40% of those in the corresponding forced convection case. The present work is concerned with the modelling of such ‘mixed’ convection flows in a vertical heated pipe. All fluid properties are assumed to be constant and buoyancy is accounted for within the ... WebApr 9, 2024 · HIGHLIGHTS. who: Shoujun Ren and collaborators from the Imperial College London, Exhibition Road, London , AZ, United Kingdom have published the paper: Stabilization mechanism revelation of a novel vortex-tube combustion technique: LES with sgs-pdf approach, in the Journal: (JOURNAL) what: Based on the approach of Brauner …
WebLaminar flow, or laminar air flow (also called streamline flow), is a liquid flow, in which the fluid moves in separate paths, as opposed to turbulent flow, where the fluid undergoes intermixing. ... Laminarization screen. A laminarizer produces distributed air flow. Fan. It is placed above the filter mat that sucks in the air and moves it all ... WebNov 1, 1970 · Experimental results are reported on the heat transfer and fluid friction of heated hydrogen and helium gas flows undergoing transition from turbulent to laminar flow in a circular tube. The entering Reynolds numbers range from 2350 to 12,500 and the nondimensional heat-flux parameter ranges from 0.0021 to 0.0061. Local heat-transfer …
WebApr 15, 2024 · Furthermore, a higher flame temperature produced a more intense action of flow “laminarization” , inhibiting the effect of the smallest turbulence scales in thickening the flame front. These two actions described above, lead to the not-so-corrugated or -thickened flame front observed, even in the case of a self-evident corrugated flamelet ... WebJun 6, 2024 · The process of laminarization of turbulent flow with heat transfer in a plane confuser with a constant constriction angle is numerically simulated. The …
WebPfenninger, W.: Laminar Flow Control Laminarization. In Special Course on Concepts for Drag Reduction, AGARD-R654, June 1977. Google Scholar Landeryou, R. R.; and Porter, P. G.: Further Tests of a Laminar Flow Swept Wing with Boundary Layer Control by Suction.
WebFeb 26, 2013 · Flow, Turbulence and Combustion ... flow laminarization due to heat transfer from the hot catalytic walls, and fuel leakage through the gaseous reaction zone. Dynamic reactor operation and intrinsic flame dynamics driven by interactions between homogeneous kinetics and catalytic walls are outlined using detailed transient simulation. … temporary database tableWebPresented results show that the flow laminarization can be the effective control method not only of the local boundary layer flow but also of the global flow structure over the aircraft … temporary data analyst jobsWebApr 11, 2024 · Some models have a small swept wing, for which the mechanism of cross-flow instability is not implemented. In this case, the laminar-turbulent transition ... An obvious approach to laminarization of the type of wings under consideration is to reduce the intensity of the acoustic noise from the fuselage. This can be achieved, for example, … temporary database mysqlWebJan 1, 2024 · Laminarization of the turbulent flow of Helium in a heated vertical finned tube was studied using a low-Reynolds number turbulence model. The study was carried out for an inlet Reynolds number of 6000, a non-dimensional wall heat flux value of 0.003, the number of fins ranging from 8 to 24, and non-dimensional fin height ranging from 0.1 … temporary digsWebJan 1, 2015 · The degree of laminarization was determined by the velocity profile. Manual pressure measurements were done to determine the air velocity at cross-sections along the pipe. temporary dikiWebFeb 1, 1972 · Measurements of local Stanton numbers in accelerating flow provide a sensitive indicator of the occurrence of laminarization. The data of Moretti and Kays [3] for example, show a rapid fall of Stanton number in regions of severe acceleration and a corresponding rise downstream therefrom where the boundary layer reverts back to … temporary dikeWebAug 1, 1970 · Boundary layer and heat transfer measurements are presented for flow through a cooled, conical nozzle with a convergent and divergent half-angle of 10 deg for a wall-to-total-gas temperature ratio of about 0.5. A reduction in heat transfer below values typical of a turbulent boundary layer was found when values of the parameter K = … temporary dental repair kit