Browsing by Author "Tiegang Fang, Committee Member"

Now showing 1 - 11 of 11

Characterization of Glycerin Combustion and Emissions
(2010-08-16) Bohon, Myles; William Roberts, Committee Chair; Tiegang Fang, Committee Member; Alexei Saveliev, Committee Member; William Linak, Committee Member
Computational Investigation of High Speed Pulsejets
(2009-10-14) Zheng, Fei; Tiegang Fang, Committee Member; Terry D. Scharton, Committee Member; Andrey V. Kuznetsov, Committee Co-Chair; William L. Roberts, Committee Chair; Renzo Shamey, Committee Member
Pulsejet may be the simplest propulsion system ever. Due to its simplicity, the pulsejet may be an ideal low-cost micro-propulsion system. Although a considerable amount of work has been done on developing different types of pulsejets, understanding of the operation of these jets is still very limited. One goal of this investigation is to study the valveless pulsejet, find out effect of the geometry of inlet, combustion chamber and tailpipe on the performance of valveless pulsejet. Another goal is to study effect of the environment, such as free stream speed, ambient pressure and temperature, on the performance of pulsejet. In this work, combined computational and experimental methods were used to study valved and valveless pulsejets to develop an understanding of how various inlets, exhaust sizes and coming flow speed effect the overall performance of the jet. Focus is put on the computational study. Fluid mechanics, acoustics and combustion were studied numerically to understand the operation of pulsejets and their interactive with the environment. The research objectives include the principles of valveless pulsejet design, optimize valveless pulsejet geometries and the effect of ejector and shroud.
Ignition of a Liquid Fuel Jet by an Electrical Discharge Propagating along the Jet.
(2010-11-19) Gray, Parker; Alexei Saveliev, Committee Chair; Tiegang Fang, Committee Member; Gregory Buckner, Committee Member
Integral Analysis of Turbulent Natural Convection with Condensation in the Presence of a Noncondensable Gas
(2010-03-08) Matar, Walid Omar; James Selgrade, Committee Member; Tiegang Fang, Committee Member; Herbert Eckerlin, Committee Co-Chair; James Leach, Committee Chair
An approximate model is presented for turbulent natural convection flow of a two-component mixture in which condensate forms along a vertical wall. The integral method is employed as the scheme for the analysis of the gas boundary layer. By incorporating empirical correlations and profiles for temperature, velocity, and density, the compressible Navier-Stokes equations are solved for boundary layer thickness and maximum velocity. Eventually, the desired physical characteristics of heat flux and condensation rate are determined. The major constraint enforced in the model is that the water within the boundary layer is either saturated vapor or slightly superheated. Local condensation away from the wall is not considered. A diverse range of mixtures were studied to examine the effects of noncondensable gas concentration on the heat transfer and condensation rates. It is shown in the results how the presence of air is a hindrance to the diffusion of vapor through the gas boundary layer. The results are compared to a previous empirical model. The results showed reasonable agreement with the previous experimental study discussed. For very large and often times more applicable temperature differences, the model predicts volumetric condensation within the gas boundary layer. A semi-empirical one-equation turbulence model was introduced, and although the turbulent impact on effective properties was determined to be small, it was included nonetheless for flexibility. Code logic and methodology are presented to automate this problem, as the solution is obtained through the iteration on both the turbulent viscosity and the interface temperature.
Investigation of Turbulent Lifted Jet Flame Stabilization using Experimental Methods and Simulations.
(2010-07-07) Wang, Wei; Kevin Lyons, Committee Chair; Tarek Echekki, Committee Chair; William Roberts, Committee Member; Daniel Gruehn, Committee Member; Tiegang Fang, Committee Member
A Methodology for Translating Detonation Wave Effects between One and Two Dimensions
(2008-05-12) Susi, Bryan; Kevin Lyons, Committee Chair; Tarek Echekki, Committee Member; Tiegang Fang, Committee Member
This research focuses on evaluating empirical methods and implementing a prototype Transitional Airblast Model (TRAM) for facilitating communication between one-dimensional and two-dimensional airblast models. An overview of detonation phenomena is presented, especially concerning detonation waves and accompanying airblast effects. Two existing airblast models are discussed that were designed to predict the effects of a detonation in two separate types of geometries, one-dimensional and two-dimensional. The functionality and behavior of each airblast model will be scrutinized giving particular insight into their performance in applications with both one-dimensional and two-dimensional components. The strengths and deficiencies of the different airblast models will offer motivation for the development of the TRAM prototype. The TRAM prototype consists of two separate methodologies, one for translating one-dimensional airblast propagation to two dimensions, and another for translating two-dimensional airblast propagation to one dimension. The selection of those two methodologies will be presented, along with results of detonation scenarios using both existing airblast models as well as the TRAM prototype. The TRAM prototype performed well for both types of detonation scenarios and is recommended for further development.
Physical, Chemical, and Toxicological Characteristics of Combustion Generated Soot-Iron Particles
(2008-07-08) Turley, Audrey Therese; William L. Roberts, Committee Chair; William P. Linak, Committee Member; Tiegang Fang, Committee Member
Soot Chemistry and Morphology from Ferrocene Doped Combustion.
(2010-11-01) Swanson, Nicholas; William Roberts, Committee Chair; Thomas Rawdanowicz, Committee Member; Kevin Lyons, Committee Member; Tiegang Fang, Committee Member; William Linak, Committee Member
Soot Formation in Laminar Jet Diffusion Flames at Elevated Pressures
(2008-08-28) Yelverton, Tiffany Leigh Berry; Tiegang Fang, Committee Member; Kevin M. Lyons, Committee Member; Tarek Echekki, Committee Member; William L. Roberts, Committee Chair; Adriana de Souza e'Silva, Committee Member
Static Efficiency of Positive and Negative Pin-Ring Type Electrohydrodynamic Air Moving Devices.
(2010-09-29) June, Michael; Kevin Lyons, Committee Chair; Thomas Ward, Committee Member; Alexei Saveliev, Committee Member; Tiegang Fang, Committee Member; Akhtarhusein Tayebali, Committee Member
Torque Converter Interactions in a Parallel Post Transmission Hybrid Driveline.
(2010-10-27) Pritchard, Ewan Gareth David; Richard Gould, Committee Chair; Nagui Rouphail, Committee Member; Tiegang Fang, Committee Member; Richard Johnson, Committee Member