Experimental investigattions are proposed on fuel atomization and air-fuel interactions in a turbulent environment. under the proposed program the two basic areas of research will be addressed; cold flow spray characterizations in a turbulent flow field with and withoutevaporation and drop drag… More

Development and application of advance spray diagnostics for the characterization of liquid rocket fuel injectors is proposed. currently, modelling efforts for the prediction of fuel and oxidizer atomization, mixing, and reaction are hampered by the unavailability of reliable experimental data.… More

Research on liquid rocket engine combustion processes consisting of injection into turbulent environments requiresdetailed information on the propellant drop size distributions, mass flux of oxidizer and fuel, drop dynamics, and continuous phase turbulence parameters. the recently developed phase… More

This research project undertakes to determine the light scattering of bubbles in a medium wherein the refractive index of the scattering medium is less than that of the surroundings. the research will focus first on the development of appropriate software to incorporate into an existing instrument… More

Development of advanced diagnostics for the determination of the liquid water (lwc) for fog and clouds is proposed. such data are fundamental to the research in cloud physics, acid precipitation, electromagnetic wave propagation, and aircraft icing. currently, the methodologies for measuring lwc are… More

Research and development of advanced laser-based diagnosticsfor the determination of drop size spectra and liquid water content (lwc) for aircraft icing research is proposed. thiseffort will lead to the development of instruments that are suitable for obtaining reliable data in large scale icing… More

In the proposed effort, simultaneous particle sizing capability will be added to a two-component laser doppler velocimeter to form a three-component system. this combination of capabilities will produce an instrument uniquely suited to the characterization of high speed, turbulent, three-dimensional… More

This proposal details the research that will be undertaken to initiate a systematic work in the diagnostics of swirlingliquid spray flames. to date, the measurement of swirling flows has been performed mostly in gaseous fuels. measurement of liquid sprays has been restricted to simple atomizers… More

Most power plants currently being used for aeronautical propulsive purposes function by burning liquid fuels in their combustion chambers. therefore, the design and development of efficient propulsion systems require the complete understanding of spray combustion processes. towards this end, several… More

The proposed device allows the detection, identification andtracking of all types of existing roadway pavement delineators. the information will provide lateral position sensing. the concept of roadway lane positioning is not new, but recent improvements in diode lasers and solid statedetectors… More

This project deals with research on the development of a newparticle diagnostic technique to investigate the dynamic behavior of particles. the novel approach uses two coaxial laser beams and the amplitude of the signals from the light scattered by the particles traversing the probe volume to infer… More

This research project shall investigate the effect of turbulence structure on cavitation in turbomachinery. phasei will develop the necessary bubble diagnostics and integrate them to the phase doppler technique to determine the size, velocity, number density, mass flux and void fraction of spherical… More

Measurements of the inlet flow fields of aircraft propulsionsystems are important in defining the thrust and efficiency of these engines as well as in flight safety when executing avoidance maneuvers. this project will develop a non-intrusive laser-doppler velocimeter (ldv) probe that is compact and… More

The present work deals with the design, development, testing and imple mentation of a real-time monitoring system to determine the particle s ize distribution of soot. the novel technique shall make use of multi wavelength analysis of the light scattering properties of the particle s to infer the… More

There is a need for non-intrusive instrumentation to characterize the drop size distribution and volume flux in support of on-line engine/inlet icing tests. The ducts may vary from three to twelve feet in diameter with flow field speeds from Mach 0.2 to 0.5. The Phase Doppler technique offers the… More

This porposal is concerned with the development of a rugged, accurate and non-intrusive electro-optical device to reliably measure the unsteady airflow into a reciprocating internal combustion engine. The principle of operation of the proposed sensor is laser Doppler velocimetry, a technique that… More

Degraded performance due to surface damage of aircraft windows and antennas caused by atmospheric particle effects is currently a very serious problem. Impact testing is currently underway in ground test cells such as the wind tunnels and arc facilities located at Arnold Engineering Development… More

The development of fire protection and explosion suppression systems is of critical importance to the safety of both military and civilian aircraft. The phase out of Halon-based fire suppression systems has created a critical need for a compact, light weight, and effective alternative for use in… More

A feasibility study of a novel atomizer and its atomization process for oil-fired burner combustion application is being carried out. the atomizer uses the effervescent atomization process to achieve good atomization with a small amount of air. the research program includes the following efforts:… More

Researchers are designing, developing, and applying novel laser diagnostics to the study of interacting droplets and spray vaporization and combustion as applied to low grade fuels. the lack of fundamental understanding of spray combustion and burning characteristics of low grade fuels calls for… More

Development of advanced diagnostic techniques and spray characterization methodologies are essential to the understanding of the complex spray process and for validating state-of-the-art CFD codes that are available for describing the spray process. Novel diagnostic techniques and measurement… More

A real-time non-intrusive turbine engine exhaust particulate monitor, based on simultaneous multi-wavelength backscattering and extinction measurements, has been proposed herein. The objective is to mathematically invert the simultaneously measured laser light extinction and light scattering at… More

The feasibility of using a novel light scattering intensity ratio technique for the simultaneous measurements of the speed and size of non-spherical particles will be examined in phase i. the technique makes use of two concentric laser beams with different diameters and the amplitude of the signals… More

Diesel injection is known to influence the combustion efficiency and the production of particulate and NOx emissions. Recent developments in the fuel injection including split injection wherein the fuel is injected in two or three pulses rather than with a single injection have led to significant… More

Development of efficient spray combustors requires a complete understanding of fundamental phenomena that influence and control the overall spray combustion process. Toward this end, detailed experimental characterization of spray flames is essential. This includes measurement of various fuel… More