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Aerodynamics Analysis Of Solid Fuel Ramjet Projectiles
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Book Synopsis Aerodynamics Analysis of Solid Fuel Ramjet Projectiles by :
Download or read book Aerodynamics Analysis of Solid Fuel Ramjet Projectiles written by and published by . This book was released on 1988 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aerodynamic characteristics of several Solid Fuel Ramjet (SFRJ) projectiles are estimated by a combination of the NSWC-Aeroprediction code and a post-processing analysis that account for the effects of inlet and the buttress threads. Comparison between predicted and measured normal-force curve slope for two SFRJ-SPINNER configurations show good agreement in one case and 18%-23% analytical under-prediction in the other. The agreement in center-of-pressure location is very good in both cases. The analysis explains the unstable flight of the 60mm SFRJ-FINNER Projectile, having original fins. The analysis predicts, for the projectile with extended fins, a static margin of 0.5 calibers at low supersonic Mach numbers, marginal stability as Mach number approaches 4.3 and instability at Mach numbers larger then 4.3. Wind-tunnel tests of this configuration show that the open inlet contributes more normal-force than accounted for in the analysis and that contribution of the fin set is slightly underpredicted by the NSWC code. The predicted normal-force curve slope is up to 11% smaller than experimentally obtained and the center-of-pressure location is in good agreement with test results. The experimentally obtained contribution of the buttress threads to the axial-force coefficient is in good agreement with the predicted value. No effect on the threads on the stability of the projectile was observed under the wind tunnel flow conditions.
Book Synopsis Comparison of Computational Analysis with Flight Tests of a 40mm Solid-Fuel Ramjet Projectile by :
Download or read book Comparison of Computational Analysis with Flight Tests of a 40mm Solid-Fuel Ramjet Projectile written by and published by . This book was released on 1989 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight tests of fueled and inert projectiles and a computational analysis of the non-burning internal flowfield have been used to study the performance of 40mm Solid-Fuel Ramjet (SRFJ) projectiles. These projectiles, as originally designed, did not produce detectable thrust in flight. the 40 mm SRFJ is essentially scaled down from a successful 75mm round. Design modifications to the 40 mm SRFJ aimed at reducing the internal velocity and/or increasing internal turbulence yielded slight performance improvements. Alternate solid fuels were found to improve thrust generation. Computational modeling is used to investigate the differences in the non-burning internal flow for 75mm and 40mm SRFJ projectiles. Analysis of internal wall pressures, shock waves and flow separation reveals that the internal flow for the 40 mm geometry can be notably different from that of the 75mm geometry. These differences may have an effect on fuel ignition and burning. However, the computational analysis does not address the effects of projectile axial spin.
Book Synopsis Performance of Solid Fuel Ramjet Guided Projectile for USN 5 Inch/54 Caliber Gun System by :
Download or read book Performance of Solid Fuel Ramjet Guided Projectile for USN 5 Inch/54 Caliber Gun System written by and published by . This book was released on 1982 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers work done on performance analysis of a 5 inch, 54 caliber gun-launched guided projectile with solid fuel ramjet (SFRJ). A computer program (TRAJET) was developed. The program contains ramjet and trajectory analysis. The ramjet part considers conical shock wave losses, inlet boundary layer losses, normal shock losses, subsonic diffuser recovery, expansion into combustor losses, heat losses at the combustor and nozzle losses. A flat earth trajectory with drag and thrust was considered. The various drag coefficients which were considered are: cowl drag coefficient, skin drag coefficient, wing (or fin) wave drag coefficient and wing (or fin) friction drag coefficient. The 5'/54 solid fuel ramjet has a capability to produce fuel specific impulse in the order of 400 - 900 sec. depending mostly on the flight altitude. The thrust coefficient varies in the range of 0.3 + or - 0.1 depending on the internal areas. A range in the order of 50 miles can be achieved with the ramjet operation compared to only 13 miles achieved by the conventional projectile. At low-altitude launch, a range of over 18 miles can be reached in Air-Defense Scenario. The ramjet propelled projectile reaches the ranges mentioned above at high Mach numbers (M0 1.8).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Fluid Dynamics Capability for the Solid Fuel Ramjet Projectile by : Michael J. Nusca
Download or read book Computational Fluid Dynamics Capability for the Solid Fuel Ramjet Projectile written by Michael J. Nusca and published by . This book was released on 1988 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational fluid dynamics solution of the Navier-Stokes equations has been applied to the internal and external flow of inert solid-fuel ramjet projectiles. Computational modeling reveals internal flowfield details not attainable by flight or wind tunnel measurements, thus contributing to the current investigation into the flight performance of solid-fuel ramjet projectiles. The present code employs numerical algorithms termed total variational diminishing (TVD). Computational solutions indicate the importance of several special features of the code including the zonal grid framework, the TVD scheme, and a recently developed backflow turbulence model. The solutions are compared with results of internal surface pressure measurements. As demonstrated by these comparisons, the use of a backflow turbulence model distinguishes between satisfactory and poor flowfield predictions. Keywords: Solid-fuel ramjets; Tubular projectiles; Navier Stokes; Separated flow. (edc).
Book Synopsis Trajectory Predictions for a 75 Mm Solid Fuel Ramjet Tubular Projectile by :
Download or read book Trajectory Predictions for a 75 Mm Solid Fuel Ramjet Tubular Projectile written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The AFAPL ramjet design analysis code was modified to predict a point mass trajectory for a 75 mm solid fuel ramjet tubular projectile. Projectile velocity was found sensitive to the combustion efficiency relation assumed. (Author).
Book Synopsis Steady Flow Combustion Model for Solid-Fuel Ramjet Projectiles by : Michael J. Nusca
Download or read book Steady Flow Combustion Model for Solid-Fuel Ramjet Projectiles written by Michael J. Nusca and published by . This book was released on 1989 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various solid-fuel ramjet (SFRJ) tubular projectiles have been developed. A spin-stabilized 75mm version has been designed for use as a tank gun training round (TGTR) for the 105mm, M68 tank cannon. Computational efforts aimed at modeling the combustion in the SFRJ are essential to future design modifications and applications of the SFRJ to high-velocity, low drag, anti-tank projectile systems. The steady flow Navier-Stokes equations are written in stream function-vorticity form and solved using a Gauss-Seidel relaxation scheme. A diffusion-flame combustion model is formulated and linked to the Navier-Stokes equations by equations for the conservation of chemical species mass and source terms in the energy equation. Since a steady-state solution is produced, solid fuel ignition and depletion events are ignored. Radiation effects due to combustion are also neglected. The diffusion-flame combustion model assumes a mass-controlled reaction between fuel and oxidizer (air). The reaction occurs in one step and is undirectional. The reaction is diffusion-controlled so that the reaction rate is faster than the diffusion rate. An actual value for the reaction rate is not required since a single equation for the conservation of fuel and oxidizer mass is formulated. The model includes the effects of axial rotation of the combustion chamber. A phenomenological turbulence model is used. Computed solid fuel regression rate and thrust for a solid-fuel ramjet projectile agree well with experimental data and in-flight observations. Keywords: Solid-fuel ramjet; Combustion model; Computational fluid dynamics. (kt).
Book Synopsis Trajectory Predictions for a 75 Mm Solid Fuel Ramjet Tubular Projectile by : Carl W. Nelson
Download or read book Trajectory Predictions for a 75 Mm Solid Fuel Ramjet Tubular Projectile written by Carl W. Nelson and published by . This book was released on 1981 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The AFAPL ramjet design analysis code was modified to predict a point mass trajectory for a 75 mm solid fuel ramjet tubular projectile. Projectile velocity was found sensitive to the combustion efficiency relation assumed. (Author).
Book Synopsis External Flow Computations for a Finned 60MM Ramjet in Steady Supersonic Flight by : Bernard J. Guidos
Download or read book External Flow Computations for a Finned 60MM Ramjet in Steady Supersonic Flight written by Bernard J. Guidos and published by . This book was released on 1989 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The US Army Ballistic Research Laboratory (BRL) has participated in the development of the launch and flight technologies for a family of solid fuel ramjet (SFRU) projectiles. The ramjet is a tubular projectile which utilizes air ingested through the inlet to burn the solid fuel. When the combustion process ceases, the projectile becomes a high drag configuration. Several designs have been developed as potential tank gun training rounds (TGTR) for kinetic energy (KE) penetrators. This report documents a computational fluid dynamics study of the external aerodynamics of a finned 60mm solid-fuel ramjet in steady, supersonic, atmospheric flight. The main objective is to compute the external contribution to the pitch-plane aerodynamics using established in-house capabilities. Two space-marching finite-difference procedures are used to compute the external flow fields. Viscous flow results are generated using a thin-layer, parabolized Navier-Stokes technique; inviscid results are generated using an Euler solver. Results are shown for three configurations; Body-alone, body with original fins, and body with extended fins. The influence of initial marching conditions on the modeling of an inlet configuration is examined. A generalized scaling law is introduced which may improve the accuracy of future external space-marching flow computations for ramjets. Keywords: Fin-stabilized projectile; Supersonic flow; Wedge flow; Conical flow. (AW).
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1590 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1988 with total page 1600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Information Indexes written by and published by . This book was released on 1974 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Reports Awareness Circular : TRAC. by :
Download or read book Technical Reports Awareness Circular : TRAC. written by and published by . This book was released on 1989-06 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Solid Fuel Ramjet Guided Projectile for USN 5"/54 Gun System by : Oded Amichai
Download or read book Performance of Solid Fuel Ramjet Guided Projectile for USN 5"/54 Gun System written by Oded Amichai and published by . This book was released on 1982 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Descriptive Summaries for Program Elements of the Research, Development, Test and Evaluation, Army Program FY ... (U) by :
Download or read book Descriptive Summaries for Program Elements of the Research, Development, Test and Evaluation, Army Program FY ... (U) written by and published by . This book was released on 1987 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
