Aerodynamics of a Lifting System in Extreme Ground Effect by Kirill V. Rozhdestvensky

By Kirill V. Rozhdestvensky

This ebook is devoted to the reminiscence of a unusual Russian engineer, Rostislav E. Alexeyev, who was once the 1st on the earth to strengthen the most important floor impact computing device - Ekranoplan. one in all Alexeyev's layout thoughts with the aerodynamic configuration of a jlying wing may be obvious at the entrance web page. The ebook offers an outline of a mathematical version of stream previous a lifting approach, acting regular and unsteady motions in shut proximity to the underlying stable floor (ground). this example is attention-grabbing for sensible reasons simply because either the aerodynamic and the industrial potency of the approach close to the floor are so much mentioned. Use of the strategy of matched asymptotic expansions permits closed shape ideas for the aerodynamic features of the wings-in-ground impact. those can be utilized for layout, id, and processing of experimental facts during constructing flooring impact cars. The time period severe flooring influence, wide-spread via­ out the e-book, is linked to very small relative floor clearances of the order of 10% or much less. the speculation of a lifting floor, relocating in instant proximity to the floor, represents one of many few proscribing situations that may be handled analytically. the writer wish to recognize that this paintings has been inspired via the guidelines of Professor Sheila E. Widnall, who was once the 1st to use the matched asymptotics recommendations to regard lifting flows with the floor impact. Saint Petersburg, Russia February 2000 Kirill V. Rozhdestvensky Contents 1. creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Show description

Read Online or Download Aerodynamics of a Lifting System in Extreme Ground Effect PDF

Best aeronautical engineering books

Composite Structures, Design, Safety and Innovation

Aerospace structural layout, specifically for giant plane, is an empirical pursuit ruled via principles of thumb and often-painful provider reviews. services on conventional fabrics isn't transferable to "new" fabrics, procedures and structural suggestions. the reason for this is that it's not in response to or derived from well-defined measures of protection.

Modelling and Control of Mini-Flying Machines (Advances in Industrial Control)

Modelling and regulate of Mini-Flying Machines is an exposition of versions built to help within the movement regulate of varied sorts of mini-aircraft: • Planar Vertical Take-off and touchdown airplane; • helicopters; • quadrotor mini-rotorcraft; • different fixed-wing plane; • blimps. for every of those it propounds: • targeted versions derived from Euler-Lagrange tools; • applicable nonlinear keep an eye on suggestions and convergence homes; • real-time experimental comparisons of the functionality of regulate algorithms; • overview of the important sensors, on-board electronics, real-time structure and communications structures for mini-flying laptop keep an eye on, together with dialogue in their functionality; • exact clarification of using the Kalman clear out to flying computer localization.

Eigenstructure Control Algorithms: Applications to Aircraft/Rotorcraft Handling Qualities Design (Iet Control Engineering)

This e-book demonstrates that eigenstructure keep an eye on thought could be simply tailored and infused into airplane industry's stringent layout practices. therefore practising flight regulate engineers will locate it necessary to discover using the hot layout thoughts mentioned within the booklet. The e-book, being interdisciplinary in nature, encompassing keep watch over idea and flight dynamics could be of curiosity to either keep an eye on and aeronautical engineers.

Aircraft Control and Simulation: Dynamics, Controls Design, and Autonomous Systems

Get an entire realizing of airplane keep an eye on and simulation airplane regulate and Simulation: Dynamics, Controls layout, and independent structures, 3rd variation is a complete advisor to airplane keep watch over and simulation. This up-to-date textual content covers flight keep an eye on structures, flight dynamics, airplane modeling, and flight simulation from either classical layout and sleek views, in addition to new chapters at the modeling, simulation, and adaptive regulate of unmanned aerial autos.

Extra info for Aerodynamics of a Lifting System in Extreme Ground Effect

Example text

As a result, as a consequence of limited computer resources, extremely elongated numerical cells appear near the body surface, causing ill conditioning of corresponding systems of equations and breakdown of most of the solvers; see Larsson [128]. In spite of the progress envisaged in numerical solution of Navier-Stokes equations with the use of large eddy simulation (LES), and ultimately through direct numerical simulation (DNS), the experts do not expect that these methods would be realized earlier than 10 and 20 years, respectively.

3 Flow Above the Lifting System and Its Wake In the upper flow field Du, where (x, Y, z) = 0(1) for ho -+ 0 and e = O(h o), both the wing and the wake approach the ground. In the limit, one comes in the upper half space to the problem for the flow, generated by the tangency conditions on the upper surfaces of the wing and the wake. , the relative ground clearance, angle of attack, curvature and thickness of the wing are small) the upper flow can be linearized, so that tangency conditions are satisfied upon the projections of the wing and wake sheet onto the plane Y = o.

On the other hand, in the expression für trailing edge flow velo city potential 'Pte pass to the variable 1/ = hoh;ev and set h o (h;e) to zero for fixed 1/ and fj = 1 + O. 54) with du replaced byeu , 'Pte -+ 'Pteu rv h;b1e u ( In 1 h7r1/ ---,;;-1/ h. 79) 40 2. 58), take different magnitudes above and below the wing (btf:b2", bj ;t:b3"). 5), which complies with the requirement for the continuity of pressure and normal velocity across the wake in the immediate vicinity of the trailing edge. We will show how to ensure realization of this condition for a thin edge (eu = el = e), and then results will be presented for the trailing edge with finite vertex angle.

Download PDF sample

Rated 4.64 of 5 – based on 35 votes