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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"heat addition"”.
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Effects of Heat Addition After the Exhaust Valve on a Small Turbocharged Diesel Engine
… tractors lighter and thereby more efficient. In addition, in many cases these vehicles only need the maximum power that an engine can produce for a small amount of time. What is needed is a small, lightweight engine with the ability to produce a large amount of power for a short duration. The …
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Projectile thrust-drag optimization with external burning
… The characteristic and linearized equations with heat addition are discuss ed, and the condition for maintaining irrotationa ity with heat addition is derived. A transition model, which extends the Crocco-Lees base flow model, and a spin model are discussed. Computed results are compared with …
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An investigation of the dynamics of phase transitions in Lennard-Jones fluids
… and application of a method to simulate external heat addition in molecular dynamics simulations of Lennard-Jones fluids. This simulation capability is very important for both purely theoretical and practical applications. Here we examine one theoretical application, namely the evaporation of …
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The Blast Waves From Unconfined Axisymmetric Vapour-Cloud Explosions
… mixture during and after the propagation of a heat addition wave which models the detonation or deflagration process. In this study the non-steady, two-dimensional fluid dynamic equations of motion were integrated using Godunov's computational scheme subject to appropriate boundary conditions. …
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A 10 kilowatt-thermal input multiple effect distillation pilot for concentrated solar power and desalination of seawater plant
The use of modular parallel plate falling film heat exchangers, optimization of thermal vapor compressor (TVC) entrainment ratio, and overall process thermal management increase the flexibility and overall efficiency of Multiple Effect Distillation (MED). A generic computational MED system model …
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Creation of a Trimmed Powered Aerodynamic Database for a Generic Hypersonic Vehicle
… the quasi-one-dimensional momentum equation with heat addition. Selected trajectory points were also evaluated using the viscous solver, FUN3D. The viscous solutions contain effects such as boundary layer separation which had a pronounced effect on the computed axial force. In all cases, the …
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An Experimental Investigation of Two-Dimensional Flame-Vortex Interactions (Acoustics Addition Rate)
… The dimensionless time rate of change in the heat addition rate, Q(t), of the flame-vortex interaction, is deduced from the acoustic pressure data via the line source equation in linear acoustic theory. The Fast Fourier Transform has been used to perform the analysis.
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Transonic thermal blooming
… are finite. The nonlinear equations with heat addition are transformed into simple linear algebraic equations through the specification of the streamline geometry in the heat release region. At a Mach number of unity, streamtube area variation was found to be directly proportional to the …
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Analysis of a Hybrid Rocket Burn Using Generalized Compressible Flow
… The combined effects of wall mass injection and heat addition are taken into account.</p>
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Wärmebelastung der Brennkammer eines Staustrahltriebwerks mit Überschallverbrennung
… boundary layer as well as the aerodynamic heating rate. For modeling the energy boundary condition at the wall, a coupled analysis of the heat transfer within the multi-layer wall material is conducted. Within the fluid, the unsteady compressible conservation equations are solved using a …
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Control strategies for supercritical carbon dioxide power conversion systems
… high net efficiency (-47%) at relatively low heat addition temperatures, primarily due to efficient compression. The bottom of this cycle approaches (but in the steady state does not cross) carbon dioxide's critical point, where high fluid densities (-600 kg/m 3) allow efficient compression. …
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Experimental Measurements of Vortex Breakdown with non-Isothermal Inflow
… previously researched, and shows the effect of heat addition at the inflow of a vortex generator on the onset and behaviour of breakdown modes. Smoke flow visualization experiments were preformed to identify heating and swirl rate effects on vortex flow, and the resulting swirl angle of the flow …
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Characterization and design of non-adiabatic micro-compressor impeller and preliminary design of self-sustained micro engine system
… in micro-impellers. These processes include (i) heat transfer to the compressor flow responsible for up to 25 points efficiency penalty, (ii) impeller casing drag (17 points penalty) and (iii) passage boundary layer loss (10 points penalty). The magnitude of the first effect is a result of the …
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An Investigation of Blast Waves Generated by Constant Velocity Flames
… and the flame was simulated by a working fluid heat addition model. The flame velocity was varied from infinitely fast (bursting sphere) through velocities characterized by the nearly constant pressure deflagration associated with low Mach number laminar flames. The properties noted included …
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Analysis of the Mechanically Choked Ram Accelerator
… flow after the diffuser via constant area heat addition in order to bind the end of the combustion zone. However, early work suggested the possibility of using a nozzle to mechanically choke the flow, allowing the flow to be accelerated to greater than Mach one at the exit. Numerical work …
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Numerical Solutions for Two- and Three-Dimensional Non-Reacting Flowfields in an Internal Combustion Engine
… with combustion simulated by constant- volume heat addition near top-dead-center on the compression stroke. The working fluid is assumed to be air of constant specific heat, with both viscous and inviscid models considered. Two- and three-dimensional engine models are examined, with the …
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Sound produced by entropic and compositional inhomogeneities
… inhomogeneities. These disturbances generate additional acoustic waves — indirect noise — if they are accelerated. The main objectives of this thesis are to examine the validity of current theoretical models for indirect noise, and to propose new ones where needed. First, a one-dimensional …
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Design of a film cooled MEMS micro turbine
… cooled by the compressor, but the large heat addition to the compressor flow causes a 30% drop in efficiency. Film cooling schemes for the turbine were investigated. An axisymmetric model showed that a coolant layer flowing radially inward may sustain the adverse centrifugal force at …
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Primary zone modeling for gas turbine combustors
… zone flows are typified by swirling flow with heat release in a variable area duct, where a central toroidal recirculation zone is formed. The goal of the research was to develop reduced-order models for these flows in an attempt to gain insight into, and understanding of the behavior of …
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Rayleigh Flow of Two-Phase Nitrous Oxide as a Hybrid Rocket Nozzle Coolant
… inviscid flow in a constant area duct with heat addition and friction. The two-phase model produced utilizes a separated phase with interface exchange model for predicting whether or not dryout occurs. The Shah correlation is used to predict heat transfer coefficients in the nucleate boiling …
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