Download or read book Numerical Study of Flow Structure and Thrust Performance for 3 D MEMS based Nozzles written by A. A. Alexeenko and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2005 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 41st AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2003 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Study of Chemically Reacting Flow in Nozzles written by Thomas J. VanOverbeke and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Assessment of Altitude Adjustable Convergent Divergent Nozzles Using Passive Flow Control written by Mohamed F. Mandour Eldeeb and published by . This book was released on 2014 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The backward facing steps nozzle (BFSN) is a new developed flow adjustable exit area nozzle. It consists of two parts, the first is a base nozzle with small area ratio and the second part is a nozzle extension with surface consists of backward facing steps. The steps number and heights are carefully chosen to produce controlled flow separation at steps edges that adjust the nozzle exit area at all altitudes (pressure ratios). The BFSN performance parameters are assessed numerically in terms of thrust and side loads against the dual-bell nozzle with the same pressure ratios and cross sectional areas. Cold flow inside the planar BFSN and planar DBN are simulated using three-dimensional turbulent Navier-Stoke equations solver at different pressure ratios. The pressure distribution over the upper and the lower nozzles walls show symmetrical flow separation location inside the BFSN and an asymmetrical flow separation location inside the DBN at same vertical plane. The side loads are calculated by integrate the pressure over the nozzles walls at different pressure ratios for both nozzles. Time dependent solution for the DBN and the BFSN are obtained by solving two-dimensional turbulent flow. The side loads over the upper and lower nozzles walls are plotted against the flow time. The BFSN side loads history shows a small values of fluctuated side loads compared with the DBN which shows a high values with high fluctuations. Hot flow 3-D numerical solutions inside the axi-symmetric BFSN and DBN are obtained at different pressure ratios and compared to assess the BFSN performance against the DBN. Pressure distributions over the nozzles walls at different circumferential angels are plotted for both nozzles. The results show that the flow separation location is axi-symmetric inside the BFSN with symmetrical pressure distributions over the nozzle circumference at different pressure ratios. While the DBN results show an asymmetrical flow separation locations over the nozzle circumference at all pressure ratios. The results show that the side loads in the BFSN is 2.5% of its value in the DBN for same pressure ratio. For further confirmation of the axi-symmetric nature of the flow in the BFSN, 2-D axi-symmetric solutions are obtained at same pressure ratios and boundary conditions. The flow parameters at the nozzle exit are calculated the 3-D and the 2-D solutions and compared to each other. The maximum difference between the 3-D and the 2-D solutions is less than 1%. Parametric studies are carried out with number of the backward facing steps varied from two to forty. The results show that as the number of backward facing steps increase, the nozzle performance in terms of thrust approach the DBN performance. The BFSN with two and six steps are simulated for pressure ratios range from 148 to 1500 and compared with the DBN and a conventional bell nozzle. Expandable BFSN study is carried out on the BFSN with two steps where the nozzle operation is divided into three modes related to the operating altitude (PR). Backward facing steps concept is applied to a full scale conventional bell nozzle by adding two backward facing steps at the end of the nozzle increasing its expansion area results in 1.8% increasing in its performance in terms of thrust coefficient at high altitudes.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation of Nozzle Flows written by Doyle D. Knight and published by . This book was released on 1988 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-dimensional grid generation code implementing the multisurface technique is developed with major emphasis on the use of color computer graphics. A precise control method is employed to permit grid point control. A significant departure from existing approaches is the extension of user interaction to all phases of grid generation. This facilitates easy and rapid developments of grids especially for 3-D applications. The code is employed to generate grids for a 3-D axisymmetric nozzle and an aircraft type section. The flow is a non-axisymmetric nozzle is computed under the assumptions of horizontal and vertical symmetry. The Mach number of external flow is 1.2. The results are validated by comparison with experiment. Overall good agreement is observed with static pressure comparisons. Preliminary flow analysis indicates the existence of a number of interesting flow structures including shocks, pressure wave systems and regions of flow separation. Keywords: Exhaust nozzles, Nozzle gas flow, Tranosonic flight, Interactive graphics, Three dimensional flow, Jet aircraft, Viscous-inviscid interactions, Computational fluid dynamics, Navier-stokes equations, Turbulence.
Download or read book An Experimental and Numerical Study of Fluid Flow in AOD Nozzles written by and published by . This book was released on 2000 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study on Some Fluid Dynamics Aspects of Axisymmetric Thrust Vectoring Nozzles written by A. Matesanz and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulations of Multiphase Flow in Supersonic Micro nozzles written by Benjamin J. Greenfield and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this computational study, we investigate the impact of multiphase flow states on the micro-nozzle thrust production under steady state conditions. Parametric studies are performed to delineate the various effects of droplet size (Stokes number) and concentration (mass loading) for a range of realistic operating conditions (Reynolds numbers) for supersonic micro-nozzle configurations based on MEMS geometries. Results are presented in terms of thrust production and nozzle efficiencies. It is found that the effect of a multiphase flow always reduces thrust production and that the degradation increases with mass loading of the dispersed phase. Under the most unfavorable circumstances simulated, it is found that the nozzle efficiency can be degraded by as much as 24 percent relative to the single-phase flow state. The observed results are explained in terms of relative thrust contributions of the gas and dispersed phases and the trajectories of the droplets.
Download or read book A Performance Evaluation of Dual Flow Thrust Vectored Axisymmetric Nozzles written by Bret D. Clark and published by . This book was released on 1999 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project was a study of cold-jet thrust vectored nozzle performance utilizing 1/32 scale models of F-15 axisymmetric nozzles.
Download or read book The Thrust Performance and Losses of a Family of Nozzles written by Brian P. Quinn and published by . This book was released on 1975 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was made to identify and quantify the internal losses that occur in the primary flow nozzles of thrust augmenting ejectors. Fifteen individually fabricated slot nozzles were designed to have different internal geometries. Tests were conducted with some thirteen geometric variations for each nozzle, and the parameters investigated, Mach number, effective area, Reynolds number, slot length/slot width, and inlet area/slot area, are related to the thrust efficiency. Also included in this study are data relating to the flow field of a slot nozzle. All data taken were from jets exhausting into a quiescent atmosphere. It is believed that this study will help improve the performance of the ejector through the development of a more efficient nozzle by optimizing the internal nozzle design.
Download or read book Numerical Analysis of Aerospace Nozzle Base Truncation and Base Bleed Effect on Thrust Performance written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rarefied Gas Dynamics written by Timothy J. Bartel and published by American Institute of Physics. This book was released on 2001-10-05 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is concerned with the properties and flows of rarefied gases and with the interactions of these gases with solid surfaces and force fields. Topics include: low density aerodynamics, jets, plumes, and propulsion clusters, aerosols, and internal flows and vacuum systems.
Download or read book 36th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 2000 3650 2000 3699 written by and published by . This book was released on 2000 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 39th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit July 20 23 2003 Huntsville Alabama 03 4700 written by and published by . This book was released on 2003 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 37th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit written by and published by . This book was released on 2001 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
