Global ETD Search
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 683 for “"nozzle"”.
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Nozzle Flow with Vibrational Nonequilibrium
… of nitrogen gas through a converging-diverging nozzle is simulated. The flow is modeled using the Navier-Stokes equations that have been modified for vibrational nonequilibrium. The energy equation is replaced by two equations. One equation accounts for energy effects due to the translational …
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Needle-free injection nozzle geometry
… fluid dynamics of NFI and address the role of nozzle design. This thesis presents the development of nozzle geometries and the optimization of the nozzle shape for NFI applications. We develop nozzle geometries that produce non-axial jets to expand the range of NFI delivery modalities. A rigid, …
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Ink jet nozzle test station
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Effect of Nozzle Pressure Ratio on Thrust and Flow Behavior in a Supersonic De Laval Nozzle
<p>Supersonic nozzles operate across a range of flow regimes. While an ideally expanded condition yields optimal thrust, practical propulsion systems rarely operate at this design point due to variations in altitude and engine operating conditions. As a result, nozzles frequently operate in …
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Modeling of mixer-ejector nozzle flows
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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A method for propulsion nozzle design
An inverse method for the design of exhaust nozzles with a specified transonic pressure distribution is presented. A problem of mixed Neumann and Dirichlet boundary condition is solved. A successive line relaxation process is used to solve the array of velocity potentials in the entire flow field. …
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Wake closure conditions in plug nozzle flowfields
The aerospike, of plug, nozzle is being proposed for future space launch vehicle applications. The design of the nozzle involves complex wake structures that directly affect engine performance. In particular, the closed or open wake condition of the flow determines the dependence of the base …
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Boundary layer growth in a converging nozzle
… incompressible fluid flow through a converging nozzle is presented. Calculations are based on a nozzle whose walls have a constant radius of curvature and a 2:1 entrance area to throat area ratio. An equation for the free stream velocity es a function of the arc length of the nozzle is derived, …
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Aerospike Thrust Vectoring Slot-Type Compound Nozzle
… thrust vectoring techniques of annular aerospike nozzles was conducted. Cold-flow blow-down testing along with solid modeling and rapid prototyping technology were used to investigate the effects of slot size, placement, geometry and orientation. The use of slot-type compound nozzles proved to be …
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Hole-Type Aerospike Compound Nozzle Thrust Vectoring
Compound aerospike nozzles were designed and tested as part of an ongoing experimental study to determine the feasibility of thrust vectoring an aerospike nozzle with the addition of a secondary port. Earlier phases of the study have indicated that a compound aerospike nozzle could provide …
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Modeling deposit formation in diesel injector nozzle
Formation of deposit in the diesel injector nozzle affects the injection behavior and hinders performance. Under running condition, deposit precursors are washed away by the ensuing injection. However, during the cool down process after engine shut down, fuel, detergent chemistry, and fluid …
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Performance measurements of a flashing flow nozzle
The performance of a flashing flow nozzle was quantified by efficiency and metastability measurements. Efficiency was calculated over a range of operating conditions, by using both inlet and exit conditions and the nozzle thrust. Metastability was quantified by a parameter that compared the …
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The effect of grindability upon nozzle pulverization
… the effect of the grindability of coal upon nozzle pulverization by running tests, in a small nozzle pulverizer unit, on various grindability coals from different coal seams in Virginia and West Virginia. The authors want the reader to know that maximum pulverization was not the object of …
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Fluidic Thrust Vectoring of Actively Controlled Nozzle Flows
L'abstract è presente nell'allegato / the abstract is in the attachment
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Transient model of preheating a submerged entry nozzle
Adequate preheating of the submerged entry nozzle (SEN) is important to avoid problems such as thermal cracks and skulling, and depends on torch configuration, fuel, SEN geometry and other factors. A steady-state axisymmetric computational model of the flame, combustion reactions, and air …
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Effects of nozzle geometry on flapper valve characteristics
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1956.
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Dense gas effects in a converging-diverging nozzle
… steady inviscid flows in a converging-diverging nozzle are presented for a general fluid. The main emphasis is placed on Bethe-Zel'dovich-Thompson fluids, i.e., those having specific heats so large that the fundamental derivative of gasdynamic is negative over a finite range of pressures and …
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Hot flow testing of multiple nozzle exhaust eductor systems.
Hot flow model tests of multiple nozzle gas turbine exhaust eductor systems were conducted to evaluate the temperature effects of several eductor design modifications. A one-dimensional analysis of a simple eductor system based on conservation of momentum for an incompressible gas was used in …
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