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Showing 1 to 20 of 35 for “"Ramjet"”.
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Solid fuel ramjet infrared signature
… on the infrared signature of solid fueled ramjets (SFRJ). Solid fuels investigated were Plexiglas, HTPB, and HTPB with aluminum, silicon, boron carbide, and/or magnesium. They were tested at chamber pressures of 80-170 psia and with equivalence ratios between 0.3 and 1.4. With the plume …
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Cold Flow Performance of a Ramjet Engine
… process and construction of the initial modular ramjet attachment to the Cal Poly supersonic wind tunnel is presented. The design of a modular inlet, combustor, and nozzle are studied in depth with the intentions of testing in the modular ramjet. The efforts undertaken to characterize the Cal Poly …
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Rotor hub for a commercial ramjet helicopter
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1954.
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Simulation of Flow in a Solid Fuel Ramjet Cavity
Cold flow inside a Solid Fueled Ramjet (SFRJ) is simulated using large eddy simulations (LES). A finite element method using a Discontinuous Galerkin bases has been implemented in the open-sourced multi-physics software SU2. Novel LES formulations of the fuel-gas boundary conditions and the heat …
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One Dimensional Analysis Program for Scramjet and Ramjet Flowpaths
One-Dimensional modeling of dual mode scramjet and ramjet flowpaths is a useful tool for scramjet conceptual design and wind tunnel testing. In this thesis, modeling tools that enable detailed analysis of the flow physics within the combustor are developed as part of a new one-dimensional …
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Numerical Investigation of Scaling Effects of a Ramjet-Powered Projectile
<p>Ramjet flowpath miniaturization is a potentially useful technology for integration into munitions to increase range, accuracy, and lethality. The emphasis of this effort is to numerically characterize the performance of a miniature hydrogen-fueled and ethylene-fueled ramjet flowpath during Mach …
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An Experimental Investigation of Ejector Ramjet Performance at Static Conditions
The performance of a methane-fueled ejector ramjet (ERJ) equipped with the Atlantis Intake System (AIS) was tested at static conditions. For static tests with no forward velocity, the AIS ERJ successfully entrained and mixed the stagnant surrounding air to create a stoichiometric mixture of 17.2 …
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Assessment of Turbulence Modelling for Compressibility Effects in Ejector Ramjet Applications
… component of the Atlantis Intake System ejector ramjet. The third-party OpenFOAM compressible flow solver, pimpleCentralFOAM, is used to simulate a Mach 1.25 axisymmetric jet discharging inside a mixing tube and is compared against PIV data. CFD results were found to over-predict the jet core …
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Experimental Validation of an Ejector Ramjet Solver at High Entrainment Conditions
… a quasi-one-dimensional control volume ejector-ramjet solver was performed at various subsonic inlet flow conditions corresponding to high-entrainment ratios. An ejector apparatus was designed to replicate the intake of an ejector-ramjet currently under development. The apparatus was then …
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Dynamique des gaz et combustion du Rim-Rotor Rotary Ramjet Engine (R4E)
Le Rim-Rotor Rotary Ramjet Engine (R4E) a le potentiel de remplacer les turbines à gaz de 1 MW et moins en offrant : (1) une densité de puissance de 7.6 kW/kg, soit le double des turbines à gaz actuelles, (2) une meilleure fiabilité et un moindre coût par sa pièce mobile unique et (3) une …
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Pyrolysis and Flamelet Model for Polymethyl Methacrylate in Solid Fuel Sc(ramjet) Combustors
Scramjets have been identified as a potential long-term replacement for rocket and ramjet propulsion systems due to their enhanced performance at high Mach numbers. The introduction of solid fuels in these scramjet systems allows for shaping of the solid fuel cavity by additive manufacturing and …
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Vehicle performance optimization utilizing the Air Turbo-Ramjet propulsion system; Methodology development and applications
<p>"The ATR (Air TurboRocket) is an air breathing propulsion system in which the turbocompressor turbine is powered by a hot drive gas which is generated independently of the air flow through the compressor. The ATR has a lower specific impulse (Isp) and higher thrust compared to a similar size …
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Numerical Simulation of UVA Ramjet/Scramjet Hypersonic Engine with Hydrogen-Air Combustion Using Wind-US
… Virginia's Mach 5, direct-connect, dual-mode scramjet engine was simulated using Wind-US, a density-based Reynolds-Averaged Navier-Stokes flow solver. Detailed flowfield simulation results are directly compared to experimental data to evaluate the accuracy of the numerical model and to provide …
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Parametric Scramjet Analysis
… work presents the performance of the ideal scramjet engine for three different combustion chamber materials and three different candidate fuels. Engine performance is explored by parametric cycle analysis for the ideal scramjet as a function of material maximum service temperature and the …
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Effect of Thermally Induced Deformation in a Supersonic Combustion Facility
… structural deformation taking place within the scramjet engine flowpath. The predicted thermal deformation is used to refine the CFD model and produce a new set of results for direct comparison with experiment during both ramjet and scramjet modes of operation. Improved agreement between CFD and …
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Scramjet Operability Range Studies of an Integrated Aerodynamic-Ramp-Injector/Plasma-Torch Igniter with Hydrogen and Hydrocarbon Fuels
… flow facility arranged as a diverging duct scramjet combustor. The facility operated at a total temperature of 1000 K and total pressure of 330 kPa. Hydrogen (H2), ethylene (C2H4) and methane (CH4) were used as fuels, and a wide range of global equivalence ratios were tested. The main data …
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Constant Velocity Combustion Scramjet Analysis
The supersonic combustion ramjet or scramjet, is the most suitable engine cycle for sustained hypersonic flight in the atmosphere. The present work deals with the performance of a scramjet engine by parametrically analyzing the performance of the ideal scramjet using the engine parameters: specific …
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Testing and development of a shrouded gas turbine engine in a freejet facility
… providing thrust at subsonic conditions and the ramjet section providing the thrust in the supersonic regime exists. The combined cycle engine (CCE) could be incorporated into a variety of applications. The building of a new freejet facility and engine test rig at the Naval Postgraduate School …
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Conceptual design and preliminary analyses of an Air-Launched Scramjet Test Vehicle
… flight time service. Supersonic combustion ramjet (scramjet) propulsion will play a key role in the development of these vehicles. Many more steps need to be taken, particularly in propulsion, before a world of hypersonic travel can be fully realized. This thesis presents the research …
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An experimental simulation of liquid fuel injection into a heated subsonic gas crossflow
… was developed and implemented. An actual ramjet combustion chamber fuel injection problem was proposed where ambient temperature fuel was injected into a heated airstream. This case was transformed through similarity parameters involving injection and freestream properties to a simulated …
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