Browsing by Author "Lu, Frank"
Now showing items 21-40 of 41
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Mean Pressure Measurements Of Micro-vortex Generator At Mach 2.5
Shih, Yusi (Aerospace Engineering, 2011-03-03)Shock wave/boundary layer interactions (SBLIs) are always an important issue for high-speed vehicles. SBLIs reduce the performance of aerodynamic surfaces and engine inlets, amongst a number of adverse effects. Micro-vortex ... -
MULTIPHASE FLOW MODELING AND ANALYSIS OF PHASED FILLING PROCESS FOR PULSED DETONATION ENGINE
Umapathy, Nirmal Kumar; 0000-0002-0207-9029 (2018-01-04)Filling of reactants into a pulsed detonation engine (PDE) should be carried out quickly because any lengthening of the fill time will lead to an increased cycle time. The fill process and, the purge process constitutes a ... -
New Detonation Concepts For Propulsion And Power Generation
Braun, Eric (Aerospace Engineering, 2012-07-25)A series of related analytical and experimental studies are focused on utilizing detonations for emerging propulsion and power generation devices. An understanding of the physical and thermodynamic processes for this ... -
Numerical and Analytical Study of Curvature Effects in Laminar Shock Wave/Boundary Layer Interactions
Grisham, James Ray; 0000-0002-7964-4380Shock wave/boundary-layer interactions (SBLIs) are one of the most complex flow phenomena because of the different types of physics involved (i.e., viscous versus inviscid) and their side effects such as boundary layer ... -
Numerical Investigation of Vortex Generator Flow Control for External-Compression Supersonic Inlets
Baydar, Ezgihan (2017-05-04)Vortex generators (VGs) within external-compression supersonic inlets for Mach 1.6 were investigated to determine their ability to increase total pressure recovery and reduce total pressure distortion. Ramp and vane-type ... -
Numerical Simulation Of Pulse Detonation Phenomena In A Parallel Environment
Ravindran, Prashaanth (Aerospace Engineering, 2007-08-23)The objective of this work was to develop a parallel algorithm that would be used in the simulation of the detonation process in the chamber of a pulse detonation engine. The emphasis is laid on reducing computation ... -
Numerical Simulations Of Transonic Wingtip
Chanrith, Suparat (Aerospace Engineering, 2014-03-12)This report presents numerical simulations using ANSYS FLUENT for a NACA 0012 wing both in two- and three-dimensional cases to compare with an experimental data. This comparison also allowed for any wall interference in ... -
Numerical Study of Detonation flame Arrestor Performance and Detonation Interaction with the Arrestor Element
Farah, Hoden Ali (2019-12-03)A numerical study of detonation propagation and interaction with a flame arrestor product in a combustible gas/vapor transport pipeline system is conducted. The flame arrestor element is modeled as a porous medium using ... -
NUMERICAL STUDY OF HIGH–FREQUENCY FLUIDIC VALVE INJECTORS FOR DETONATION ENGINE APPLICATIONS
Yalavarthi, Sushma (2019-12-05)The feasibility of fluidic valves for use in detonation-based engines was studied numerically. The fluidic valve acted by shutting off reactant flow through the high pressure behind detonation waves propagating past the ... -
Numerical Study Of Sidewall Filling For Gas-fed Pulse Detonation Engines
Rongrat, Wunnarat (Aerospace Engineering, 2013-03-20)Pulse detonation engines for aerospace propulsion are required to operate at 50-100 Hz meaning that each pulse is 10-20 ms long. Filling of the engine and the related purging process become dominant due to their long ... -
Observation of the Interaction Between a Transonic Shock Wave and a Wingtip Vortex
Bushmire, Troy T; 0000-0002-5999-3217 (2018-12-04)The present study observes the interaction between two fundamental phenomena in fluid mechanics: the transonic shock wave and the wingtip vortex. While these are two areas of fluid mechanics in which extensive experimental ... -
On The Near Field Mean Flow Structure Of Transverse Jets Issuing Into A Supersonic Freestream
Dickmann, Dean Anthony (Aerospace Engineering, 2008-04-22)The near field mean flow structure of transverse jets issuing from a surface into supersonic crossflow is examined using numerical methods and separation topology. The Navier-Stokes solver Falcon, developed at Lockheed ... -
Parametric Analysis Of A Detonation-type Turbofan
Swamy, Yashwanth M. (Aerospace Engineering, 2012-04-11)A new type of turbofan which detonates a fuel-air mixture was theoretically found to perform better than a conventional turbofan. A continuous detonation process is described and considered inside the core of the turbofan. ... -
Parametric Cycle Analysis For Pulse Detonation Engines
Hekiri, Haider (Aerospace Engineering, 2007-08-23)The performance of an ejector-driven pulse detonation engine (PDE) with an afterburner is analytically estimated. In the analysis, the PDE was modeled as a straight tube, closed at the front end and open at the other. A ... -
Performance Modeling and Experimental Investigations of Rotating Detonation Engines
Mizener, Andrew Ryan; 0000-0003-2659-580X (2018-12-13)The rotating detonation engine (RDE) is a promising propulsion concept that has the potential to offer increased thermodynamic performance in a compact package with no moving parts. A series of analytical and experimental ... -
Static And Dynamic Calibration Of A Multi-component Sidewall Force Balance For A Transonic Ludwieg Tube Wind Tunnel
Werling, Michael Gerard (Aerospace Engineering, 2012-04-11)Experimentation involving transonic flow requires replicating not only the Mach number but also the Reynolds number. Improper matching of the Reynolds number affects the interaction between the shocks and boundary layer ... -
Study Of Blast Wave Impact On Concrete
John, Ajit Geevarghese (Aerospace Engineering, 2007-08-23)The past decade has brought an upsurge of terrorist attacks throughout the world. A common form of attack is bombings employed against a civilian structure. These bombs lead to blast waves resulting from high explosive ... -
TOTAL TEMPERATURE MEASUREMENT AT PULSE DETONATION ENGINE EXHAUST
Kawle, Ninad Ramesh; 0000-0003-0981-8143 (2016-08-26)Pulse detonation engines (PDEs) are being studied in recent years as a potential means of power production. In PDEs, a supersonically travelling detonation wave traverses through the detonation tube. Total temperature of ... -
Transient Flow Analysis Of Filling In Pulse Detonation Engine
Jinnala, Veera Venkata Suneel (Aerospace Engineering, 2010-03-03)The Pulse Detonation Engine (PDE) is considered to be a propulsion system of future air vehicles. The objective of the present study is to model an efficient inlet system for filling the detonation tube completely with the ... -
Unsteady Thrust Measurement Techniques For Pulse Detonation Engines
Joshi, Dibesh Dhoj (Aerospace Engineering, 2014-07-14)Thrust is a critical performance parameter and its correct determination is necessary to characterize an engine. Many conventional thrust measurement techniques prevail. However, further developments are required for correct ...