The objective of the proposed Phase-I research effort is to assess the feasibility of performing high-speed (1-5 kHz) particle-image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) for understanding combustion stability and related phenomena in gas-turbine augmentors. Initial… More

A class of high amplitude and high bandwidth actuators called localized arc filament plasma actuators (LAFPAs) have recently been developed at OSU and used for control of high-speed and high Reynolds number jets. The control included successful noise mitigation in a Mach 0.9 jet and mixing… More

Flow control using high-frequency actuation to reduce acoustic and vibrational loading from weapons bays and sensor apertures requires a diagnostic approach that can capture instantaneous flowfield data at rates of several kHz. Moreover, large wind tunnel facilities suffer the difficulty that… More

The objective of the proposed Phase-I research effort is to develop femtosecond (fs) laser-based coherent anti-Stokes Raman scattering (CARS) spectroscopy for providing quantitative high-speed (1-10 kHz) temperature and species concentration measurements in unsteady reacting flows. The initial… More

The objective of the proposed Phase-I research effort is to perform temperature and species measurements in both H2-air and C2H4-air flames using a fiber-coupled picosecond CARS system. Single-mode and step-index multi-mode fibers will be investigated for the delivery of the picosecond lasers to… More

Acoustic liners are presently used for attenuating combustion and turbine noise radiated from jet engines. Current acoustic liners are passive by nature. This is a drawback because they are only able to absorb acoustic energy over a limited bandwidth. A possible solution to this drawback is the… More

Flow control using high-frequency actuation to reduce acoustic and vibrational loading from weapons bays and sensor apertures requires a diagnostic approach that can capture instantaneous flowfield data at rates of several kHz. Moreover, large wind tunnel facilities suffer the difficulty of… More

The objective of this Phase-II effort is to build and deliver a high-speed laser system for performing particle-image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) of OH at rates of 5 to 10 kHz in augmentor test facilities. This state-of-the-art laser system will allow velocity and… More

The prediction of laminar-turbulent transition of hypersonic boundary layers is critically important to the development of hypersonic vehicles that are to be used for rapid global access. Boundary layer transition has first-order impacts on aerodynamic heating, as well as drag and control of… More

We propose Phase I and II efforts that will focus on turbomachinery flow control. Specifically, the present work will investigate active control in a high speed turbine flow. The flow control actuators will be Single Dielectric Barrier Discharge (SDBD), or "plasma actuators." The work will be… More

The goal of achieving efficient flow control becomes even more challenging for MAVs as a result of the significant weight and size limitations. These preclude the use of complex hardware and control schemes which may be usable in conventional aircraft. In this research program, we propose an… More

The goal for the proposed Phase I research is to develop a new particle imaging velocimetry and thermometry (PIVT) method to measure velocity and temperature distributions simultaneously in reactive and non-reactive flows by using lanthanide doped nanoparticles. Specifically, the proposed study… More

Abstract

JP-10 is a single-compound C10H16 fuel that is the principal air-breathing missile fuel used in the U.S. at present. We propose that its effective use can be advanced by modeling its chemistry and combustion physics, testing these predictions against laboratory and full-scale experiments, and then… More

A class of high amplitude and high bandwidth actuators called localized arc filament plasma actuators (LAFPAs) have been developed at OSU and used for control of high-speed and high Reynolds number jets. The control included successful noise mitigation in a Mach 0.9 jet and mixing enhancement in a… More

The objective of the proposed Phase-I research effort is to perform velocity, temperature, pressure, and H2O concentration measurements at the end of a detonation tube and the exhaust of a detonation-powered turbine at a rate of 50 kHz. These measurements will help quantify the efficiencies of… More

We propose an innovative sensor technology that combines a high-bandwidth Time-Division Multiplexing laser system along with a 3D tomographic reconstruction model to provide spatially and temporally resolved 3D temperature and H2O concentration image of the flow field at data rate of 50 kHz. The… More

We propose to develop a suite of MEMS-miniature, a.c.-driven, weakly-ionized plasma devices configured as flush-mounted sensors for direct measurement of heat flux, mass-flow, strain, and gas species for advanced engine prognostics and diagnostic monitoring. Among the advantages of plasma-based… More

Laser micromachining is being widely used in every industry, including aerospace, automobile, microelectronics and bio-technology. The recent advent of commercial turn-key, high power femtosecond lasers has prompted a great amount of interest in using femtosecond lasers for machining. It has been… More

The objective of this Phase-II research effort is to build and deliver a fully operational fiber-coupled picosecond (ps) laser-based CARS system for measuring gas-phase temperature in reacting flows. The proposed fiber-based CARS system will also be fully capable of nanosecond operation with the… More

The objectives of the proposed Phase-II research effort is (1) to develop single-shot femtosecond (fs) laser-based coherent anti-Stokes Raman scattering (CARS) spectroscopy for providing quantitative high-speed (1-10 kHz) temperature and species concentration measurements in unsteady reacting flows,… More

The proposed Phase I SBIR program will study the feasibility of building next-generation burst-mode laser diagnostics that will enable unparalleled planar imaging capabilities for quantitative analysis of flow parameters, such as velocity, temperature, and species concentration in large-scale… More

The objectives of this Phase-II research effort is focused on transitioning noninvasive diagnostic techniques based on ultrafast lasers for characterizing nanoenergetic materials and their performance in rocket engine environments. Through the use of ultrafast laser imaging and spectroscopy, it is… More

The objective of this Phase-I research effort is to develop a force field (FF) based reactive molecular dynamics (MD) simulation program to understand hydrocarbon cracking catalysis on well-defined aluminosilicate systems and on Fe- and Co-doped catalysts. Full dynamical description of the… More

Spectral Energies, LLC and The University of Notre Dame propose to develop weakly-ionized plasma devices for the measurement of flow conditions in gas turbine inlets. The design of these devices is based on the work of Matlis and Corke who developed a.c. plasma sensors for measurement of mass-flux… More

The objective of this research effort is to develop a 3-D tomographic reconstruction strategy along with user-friendly software for providing spatially and temporally resolved temperature and H2O concentration data cubes in augmentor flow fields at rate of 50 kHz. This strategy model will be… More

The objective of the proposed Phase-II research effort is to build and deliver a hyperspectral sensor to perform velocity, temperature, pressure, and H2O concentration measurements at the end of a detonation tube and the exhaust of a detonation-powered turbine at a rate of 50 kHz. These… More

Spectral Energies, LLC in collaboration with University of Notre Dame is developing a "suite" of ac-driven, weakly-ionized plasma devices configured as flush-mounted high-bandwidth sensors to measure quantities that are important to gas-turbine engine performance. The sensors are designed for… More

As current gas turbine engines operate with hot gas temperatures well beyond the melting temperatures of the materials used within the machine, cooling of these components is a crucial aspect of engine performance. In flight knowledge of the levels of coolant air bled from the compressor serve… More

The objectives of this Phase-II research effort is focused on transitioning noninvasive diagnostic techniques based on ultrafast lasers for characterizing nanoenergetic materials and their performance in rocket engine environments. Through the use of ultrafast laser imaging and spectroscopy, it is… More

NASA, and all users of turbomachinery, continuously requires improvements in engine durability and efficiencies. As combustion engineers push turbine inlet temperatures to new extremes, cooling designers are faced with increasing heat loads and less available coolant usage. Surface cooling… More

Fundamental understanding of noise generation and the development of noise reduction technology requires the development of tools that can analyze simultaneously the relationship between the turbulent flow field and the pressure field both near and far. In this proposal we will demonstrate how… More

The proposal is aimed at the development of a miniature high bandwidth (1 MHz class) plasma sensor for flow measurements at high enthalpies. This device uses a plasma discharge between two encapsulated electrodes as the primary sensing element to measure various flow parameters including mass flow.… More

The current proposal addresses the need for development of an accurate and complete mechanism for the reaction of nanoparticles (using Al as a test case), formulation of mathematical models describing all the chemical, mechanical, and physical processes, predictions for the improvement of Al… More

The development of airborne High-Energy Laser (HEL) systems is currently receiving a high level of research effort. There is growing evidence that spherical turrets are not ideal mounting platforms for HEL systems because they are highly susceptible to flows that produce strong optical aberrations… More

The objective of this research is to determine if microwave energy deposition can be localized by laser or other means such that significant levels of power/energy can be delivered to off body locations for flow control applications. Preliminary work has shown that very low energy short pulse laser… More

ABSTRACT: An optical technique for reliably separating and quantifying the liquid and vapor phases of real fuels has been elusive. Challenges include multiple scattering in dense regions, complex laser interaction with the fuel, a wide range of length scales, and effects of temperature and… More

ABSTRACT: There are two overarching objectives of the Phase-I research effort. The first objective would be to provide non-invasive optical measurements for quantifying the pattern factor of the exhaust products from a Well-Stirred Reactor when it is entering a test-section that includes turbine… More

This research program proposes to make significant advances toward a novel framework for optimal design of sensors and actuators for use in closed-loop control of dual-mode scramjet engines. The proposal specifically aims to implement control theoretic methods to aid the user in determining the… More

The noise due to jet engine exhausts of current military and commercial aircraft continues to be a major environmental concern since the advent of jet aircraft. Challenges associated with increasing levels of noise pollution include aircraft operations ashore and afloat. The high frequency, intense… More

ABSTRACT: Spectral Energies, LLC in collaboration with the University of Notre Dame and Georgia Tech proposes to develop flow control approaches for mitigating adverse effects of shock formation, unsteadiness, and shock-induced separation on aero optical turrets. The work will focus for the first… More

The measurement of convective, pressure wave-packets in the near field for a full-scale engine is desired because these wave packets can be used to predict the far-field sound. In this proposal we outline a plan to develop software, design a robust mechanical structure, design a microphone array… More

ABSTRACT: Modern gas turbines must reduce emissions while demonstrating improved efficiency, durability, and performance. Designers are using higher compression ratios and peak temperatures to meet these goals. Flows in the area of the turbine inlet are highly unsteady, non-uniform, and… More

ABSTRACT: The objective of this Phase-II research effort is to further develop, validate and apply the ReaxFF force field parameters for hydrocarbon cracking catalysis on Fe- and Co-doped aluminosilicate systems. During Phase I we demonstrated the feasibility of the ReaxFF method for this… More

An advanced optical instrument is proposed with the capabilities of distinguishing between fluid and solid components of an image and measuring the velocity field and acceleration field of each. The design is based on the well known and robustly practiced principles of particle image velocimetry,… More

ABSTRACT: The objectives of this Phase-I research effort are to perform various advanced laser-based measurements in a laboratory flame for various hydrocarbon fuels in order to identify suitable technologies as well as to develop a mathematical model for investigating various combustion… More

ABSTRACT: The primary objective of this research effort is to develop a next-generation X-ray tomography and surface topology imaging system for four-dimensional (4-D) characterization of liquid mass distributions within dense fuel sprays. This will be accomplished through high-speed 3-D imaging,… More

ABSTRACT: This Phase-I research effort will enable propulsion engineers to design and control high-pressure combustors/augmentors operating on various aerospace fuels and emerging alternatives by developing a set of nonlinear analysis tools that can achieve two overarching goals: efficiently… More

ABSTRACT: The objective of this program proposed by Spectral Energies, LLC and University of Texas at Austin is to develop a novel framework for optimal design of sensors and actuators for use in closed-loop control of dual-mode scramjet engines. In Phase I, the framework was developed by analyzing… More

ABSTRACT: The noise due to jet engine exhausts of current military and commercial aircraft continues to be a major environmental concern since the advent of jet aircraft. The high frequency, intense noise, and associated vibration pose physical and environments hazards to air crews, ground support… More

ABSTRACT: The objectives of the proposed research effort is to provide a comprehensive measurements and modeling tools to understand the physics and chemistry associated with burning phenomenon near the turbine surface for various cooling hole configurations. Current state-of-the-art measurements… More

ABSTRACT: An optical technique for reliably separating and quantifying the liquid and vapor phases of real fuels has been elusive. Challenges include multiple scattering in dense regions, complex laser interaction with the fuel, a wide range of length scales, and effects of temperature and… More