Abstract:This proposal addresses the development of multi-junction solar cells for more complete utilization of the full solar spectrum. The approach uses a cell architecture based on an electrode nano-element array and a counter electrode array to achieve optimized light and carrier collection management… more
Abstract:The uncertainty quantification methods developed under this program are designed for use with current state-of-the-art flow solvers developed by and in use at NASA. The Phase I program demonstrated the CRISP CFD<SUP>REG</SUP> error quantification and reduction code with simulations… more
Abstract:An orifice element is commonly used in liquid rocket engine test facilities either as a flow metering device, or to provide a large reduction in pressure over a very small distance in the piping system. While the orifice as a device is largely effective in stepping down pressure, it is also… more
Abstract:Current combustor design simulations aimed at reducing greenhouse gas emissions and improving fuel-lean combustion have entailed using large amounts of dedicated CPU resources for extended time periods due to the expense of solving detailed, strongly-coupled, chemical kinetic models. Such models… more
Abstract:Pyrotechnically actuated valves are triggered on or off by firing an explosive charge that rapidly releases large amounts of high-pressure, gas. Pyrovalves are generally used for critical safety functions in almost all liquid and solid rocket systems and are designed to be fail-proof and provide… more
Abstract:The proposed SBIR Phase I & II programs will lead to the validation of a state-of-the-art Large Eddy Simulation (LES) model, coupled with a Ffowcs-Williams-Hawkings (FW-H) farfield acoustic solver, for supporting the development of advanced engine concepts, including innovative flow control… more
Abstract:New high-efficiency, low-emission, fuel-flexible gas turbine designs will operate at fuel lean conditions near the flame blow-out limit. To maintain high efficiency and flame stability under these conditions, a detailed knowledge of the flame dynamics will be required from both experimental and… more
Abstract:ABSTRACT: Our Phase II program concentrates on extending, rectifying, and validating the ETM engineering transition model for 3D flows. ETM solves PDE"s for both transition onset and intermittency and has full 3D capabilities, shown to generate swept onset curves and variable transitional… more
Abstract:An innovative approach for incorporating the coupled interaction between a ship airwake and rotor downwash in real-time dynamic interface simulations is proposed. The approach will use a database of high-fidelity ship-alone and coupled rotor-ship airwake CFD simulations to train an artificial neural… more
Abstract:This proposal deals with the extension of physics in CFD codes to permit their more accurate and reliable analysis of transient missile jet/exhaust interactions. Such interactions include those associated with divert jet firings and with stage-separation, and their analysis is complicated by the… more
Abstract:One of the persistent problems affecting the aerodynamic performance of rotorcrafts is retreating blade stall that results in large pitching moments and hazardous control situations. Our primary goal is the development of an unsteady design optimization framework that can be applied to refine… more
Abstract:Accurate and efficient modeling of rotorcraft flowfields is challenging due to a combination of unsteady flow dynamics and a large disparity in Mach numbers. Preconditioning techniques used to alleviate numerical stiffness from low Mach numbers in steady flows have not performed as well in unsteady… more
Abstract:The program focuses on CFD modeling requirements for predicting Multiple Reaction Control Jet (MRCJ) plume flowfields for hypersonic interceptors. Unified k & #949; turbulence model, and varied extensions that provide for scalar fluctutation models (SFM), baroclinic torque effects,… more
Abstract:Modeling of missile plume signature emissions play a crucial role in supporting system-oriented studies in a number of important areas related to detection and identification of the rocket motor during high altitude maneuvers. Examples of these areas include early warning systems, post launch… more
Abstract:Characteristics of missile plume signature emissions have a great potential to enhance defensive capabilities in a number of important areas related to Ballistic Missile Defense Systems (BMDS). Supporting MDA"s engineering applications related to missile typing, discrimination, tracking,… more
Abstract:Characteristics of missile plume RCS have a great potential to enhance defensive capabilities in several areas related to Ballistic Missile Defense Systems (BMDS). Supporting MDA"s engineering applications related to missile typing, discrimination, tracking, algorithm development, etc. requires… more
Abstract:Characteristics of missile plume UV/Visible emissions & RCS have a great potential to enhance defensive capabilities in several areas related to Ballistic Missile Defense Systems (BMDS). Supporting MDA"s engineering applications related to missile typing, discrimination, tracking, algorithm… more
Abstract:ABSTRACT: The technical objective of this program is to develop a fast running, subgrid scale turbulence-chemistry interaction model for large-eddy simulation (LES) of aircraft combustors and augmentors that can accurately capture critical phenomena such as extinction and re-ignition effects. To… more
Abstract:The proposed effort will conduct the development of the HSSS-DAT (High Speed Store Separation Data Acquisition Technique) System for simultaneously measuring store trajectories and instantaneous flow state during store dispense at high-speeds from weapons bays. CRAFT Tech & NCPA will complete… more
Abstract:Our proposal involves the formulation and development of innovative technical approaches for accurately simulating the transient power-on separation event for a multi stage, supersonic/hypersonic missile. As part of this Phase II effort we will undertake the development and validation of a time… more
Abstract:Our Phase II program will provide for the design, fabrication, and testing of skin friction gauges and force measurement modules that will operate in a hypersonic scramjet propulsive flowpath with hydrogen/air combustion. Gauges will be installed in the CUBRC Combustion Duct and a test matrix… more
Abstract:The program focuses on turbulence modeling enhancements for predicting coupled jet interaction baseflows. Unified ke turbulence model, and varied extensions that provide for scalar fluctutation models (SFM), baroclinic torque effects, realizability constrainst, vorticity/strain non-equilibrium… more
Abstract:Our proposal addresses the high fidelity modeling of transient rocket exhaust plumes in a static test environment. Static testing provides a practical means of obtaining plume signature data to support model validation. However, existing CFD codes routinely used for plumes in flight cannot… more
Abstract:ABSTRACT: Data rates necessary to support the warfighter continue to increase. New satellite interconnects are needed which have minimal signal distribution weight and power overhead. Optical backplanes which accommodate these new"short haul"payload processing and"long… more
Abstract:Navy aircraft are currently using proprietary, size, weight and power inefficient copper interconnects for avionics. These interconnects are costly for the Navy to maintain and to retrofit. New solutions are needed that are standards-based, easily upgraded and maintained, and leverage the efficiency… more
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