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.
Results
Showing 1 to 18 of 18 for “"swirl flow"”.
-
Swirl flow in dispersed flow film boiling,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
-
Boundary Layer Development in Laminar Swirl Flow Inside a Circular Pipe.
… within the developing boundary layer of a swirling flow of an incompressible fluid in a circular pipe are investigated in this study. It is assumed that the intake conditions are such that the fluid, moving in the direction of the axis of the pipe, enters the pipe with an axial component …
-
Oxy-combustion of High Water Content Fuels
… that have been heavily diluted with water in a swirl-stabilized burner. Ethanol and 1-propanol were first tested as the fuels and the flame stability maps were obtained. Flame stability, as characterized by the blow-off limit -- the lowest O2 concentration when a flame could exist under a given …
-
3D Numerical Simulation to Determine Liner Wall Heat Transfer and Flow through a Radial Swirler of an Annular Turbine Combustor
… of a gas turbine annular combustor with radial swirlers, over a Reynolds number range from 50,000 to 840,000. A three dimensional hybrid mesh of around twenty five million cells is created for a periodic section of an annular combustor with a single radial swirler. Different turbulence models …
-
Air/fuel mixing enhancement and emission reduction through intake port design and various fuel emulsions for diesel combustion
… strong in-cylinder tangential velocity, known as swirl flow, to promote air/fuel mixing. The mean and turbulent characteristics of the swirl flow were explored under various valve lifts using particle image velocimetry (PIV). This information is of significant value for advanced combustion …
-
Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit.
The effects of swirling flow and spark locations on the specific rate of growth of flame area, the flame speed and the convection velocity are investigated experimentally in a constant volume vessel near the lean misfire limit for an equivalence ratio of 0.645 using the shadowgraph technique. The …
-
Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics
… optical engine to improve the understanding of a swirl-influenced, wall-interacting diesel flame. The optical access to the engine combustion chamber was made possible via multiple quartz windows positioned in a cylindrical piston bowl and cylinder liner. Using the common-rail fuel injection …
-
An inverted pressurized water reactor design with twisted-tape swirl promoters
… to improve the core DNB performance by using swirl flow promoters. This thesis further takes advantage of the new core geometry to increase the core power density by using twisted tapes (TTs) as swirl flow promoters inside the IPWR cooling channels. The study focuses on optimizing the cooling …
-
Comparative Evaluation of Vorticity Transport Modeled Distortions and High-Fidelity ANSYS Solutions Using Modal Assurance Criterion
Swirl of any magnitude present at the AIP has been shown to have the potential to drastically impact the performance of fan-based propulsion systems. This work presents the evaluation of a vorticity transport based reduced order model (ROM) in comparison to similar data created through Ansys CFX …
-
Investigation and characterization of pressure drop in evenly spaced twisted tapes
… objective was to characterize the development of swirl flow in sequential twisted tapes. The second objective was to create a correlation for the Darcy's friction factor as a function of the Reynolds number (Re), tape twist ratio (y), and tape spacing (s) which could be used for both Ferroni's …
-
Simulations of turbulent swirl combustors
This thesis aims at improving our knowledge on swirl combustors. The work presented here is based on Large Eddy Simulations (LES) coupled to an advanced combustion model: the Conditional Moment Closure (CMC). Numerical predictions have been systematically compared and validated with detailed …
-
Departure from nucleate boiling and pressure drop prediction for tubes containing multiple short-length twisted-tape swirl promoters
… fuel is the continuous medium and the moderator flows through coolant channels, has potential to outperform a traditional pressurized water reactor (PWR). Similar to the traditional PWR, the IPWR design involves a tradeoff between core pressure drop and the minimum departure from nucleate boiling …
-
Investigation of Swirl Flows Applied to the Oil and Gas Industry
Understanding how swirl flows can be applied to processes in the oil and gas industry and how problems might hinder them, are the focus of this thesis. Three application areas were identified: wet gas metering, liquid loading in gas wells and erosion at pipe bends due to sand transport. For all …
-
High order stochastic transport and Lagrangian data assimilation
… passive tracer advection in a deterministic swirl flow, stochastic flow past a cylinder, and stochastic lid-driven cavity flow. We show that our schemes improve the consistency between reconstructed DO realizations and the corresponding MC realizations, and that we achieve the expected order …
-
Spray visualization and characterization of a multi variable circular orifice (MVCO) injector coupled with a swirl adapter for diesel reformer applications
… (MVCO) fuel injector coupled with a swirl-producing adapter was studied. The spray characteristics such as spray penetration length, spray velocity etc. and the atomization performance were evaluated. The measurement was conducted on an engine facility where diesel fuel was delivered …
-
Experimental Investigation of Flow and Wall Heat Transfer in an Optical Combustor for Reacting Swirl Flows
The study of flow fields and heat transfer characteristics inside a gas turbine combustor provides one of the most serious challenges for gas turbine researchers because of the harsh environment at high temperatures. Design improvements of gas turbine combustors for higher efficiency, reduced …
-
Two-phase CFD analyses in fuel assembly sub-channels of Pressurized Water Reactors under swirl conditions
… the detailed two-phase modeling of boiling flows under swirl conditions in sub-channel geometries of pressurized water reactors (PWR) FAs, including a realistic description of the critical heat flux (CHF)-phenomena and identification of two-phase indicators characterizing CHF-phenomena. The …
-
Liquid vapor phase change for highly efficient and sustainable cooling
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01