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Author: Publisher: ISBN: Category : Languages : en Pages : 127
Book Description
A passive method of enhancing the rate of entrainment by as much as 500% in subsonic open nozzle flows has been obtained by modifying axisymmetric nozzle geometry to a 2:1 aspect-ratio elliptic nozzle. Small aspect-ratio elliptical nozzles have been demonstrated to more efficiently control mixing processes and to exhibit increased rates of spreading, entrainment and fine- scale mixing than axisymmetric nozzles at subsonic and supersonic conditions in a confined dump combustor and in high-temperature ramjets. Vortex self-induction is the principle mechanism controlling mixing processes in asymmetric jet nozzles.
Author: Publisher: ISBN: Category : Languages : en Pages : 127
Book Description
A passive method of enhancing the rate of entrainment by as much as 500% in subsonic open nozzle flows has been obtained by modifying axisymmetric nozzle geometry to a 2:1 aspect-ratio elliptic nozzle. Small aspect-ratio elliptical nozzles have been demonstrated to more efficiently control mixing processes and to exhibit increased rates of spreading, entrainment and fine- scale mixing than axisymmetric nozzles at subsonic and supersonic conditions in a confined dump combustor and in high-temperature ramjets. Vortex self-induction is the principle mechanism controlling mixing processes in asymmetric jet nozzles.
Author: Subrato Chandra Publisher: ISBN: Category : Aerodynamics Languages : en Pages : 192
Book Description
The control of VTOL aircraft during transition from hover to forward flight is complicated by the lifting jet-airframe interaction. This analysis is concerned with the entrainment aspect of two dimensional thick curved jets. A realistic mathematical model of such jets should account for different entrainment rates and the total pressure decay in the jet. The present theoretical analysis predicts curved jet characteristics needed for an accurate mathematical modelling of two dimensional lifting jets. The present analysis performs an integral method analysis of the curved jet using incompressible, fully turbulent, curved, free jet equations. Integral methods need specified jet edge velocity distributions. This streamwise velocity distribution depends on the airfoil geometry as well as on the jet. The present theory approximately retains this ellipticity by obtaining the streamwise jet edge velocities from a nonlinear iterative potential flow analysis of a thin jet issuing from the trailing edge of a hinged flat plate. The results of the present analysis are in agreement with available straight and curved jet results. The present theory predicts significantly (10%-20%) different entrainment rates near the exit where the curvature is maximum. Since V/STOL lift, moment, and pressure drag are significantly affected by the jet entrainment, one should incorporate the asymmetry of entrainment rates of curved thick jets in prediction methods. (Author).
Author: Thomas R. Yechout Publisher: AIAA ISBN: 9781600860782 Category : Aerodynamics Languages : en Pages : 666
Book Description
Based on a 15-year successful approach to teaching aircraft flight mechanics at the US Air Force Academy, this text explains the concepts and derivations of equations for aircraft flight mechanics. It covers aircraft performance, static stability, aircraft dynamics stability and feedback control.
Author: Liquan Xie Publisher: CRC Press ISBN: 1138026360 Category : Technology & Engineering Languages : en Pages : 742
Book Description
Advanced Engineering and Technology contains 110 technical papers from the 2014 Annual Congress on Advanced Engineering and Technology (CAET 2014, Hong Kong, 19-20 April 2014, including the 4th Workshop on Applied Mechanics and Civil Engineering, AMCE 2014). The contributions focus on advanced theories and technologies related to building engineering, geotechnical engineering, road and bridge engineering, hydraulic engineering, environmental engineering, pollution and control, water resources and water treatment, mechanics in engineering, water and soil conservation, numerical software and applications, climate change and environmental dynamics, intelligent safety systems, chemistry, biochemical and food engineering, and modelling and data analysis. Advanced Engineering and Technology will be useful to academics and professionals involved in civil engineering, hydraulic engineering, environmental engineering, modelling & data analysis, chemistry and biochemical engineering, and other related fields.
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Author: Robert W. Cubbison
Author: Subrato Chandra
Author: Jinjun Wang
Author: Robert W. Cubbison
Author: Thomas R. Yechout
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Author: 
Author: Thomas W. Longstaff (1LT, USAF.)
Author: Liquan Xie