|Nanopowders, Thin Films, and Devices|
nGimat has developed spray and fuel preparation solutions designed to deliver improved performance and reduced emissions for gas turbines and internal combustion engines. nGimat's proprietary Nanomiser® Device enables controlled delivery of an ultra-fine aerosol typically consisting of sub-micron droplets, which allows efficient combustion of a variety of fuels in diesel engines (exhaust after-treatment, secondary fuel injection, direct injection, pre-heating), gas turbines (fuel injection and instability suppression), multifuel engines, oil burners, and chemical processing.
nGimat is currently developing fuel injectors for advanced aircraft with flow rates up to 90 g/s (750 lbm/h). Future military gas turbine combustors will deliver higher thrust-to-weight ratios than current designs, resulting in increased combustor pressures and temperatures. Reliability of these advanced engines will depend, in part, on fuel injection systems that resist coke fouling in their harsh environment. These high performance injectors need to handle a wide range of fuel properties as temperatures increase from ambient to very high temperatures during the engine cycles. The figure below shows an atmospheric Jet-A flame with a clean-burning blue flame resulting from using our injector. The standard injector flame was white from carbon luminescence, which indicates the formation of carbon species.
Since the Nanomiser Device atomization is not based on air-assisted or pressure breakup mechanisms, this technology is capable of operating at a wide range of injection pressures (from 10-20 psi to thousands of psi) and without an external air supply. We have recently demonstrated efficient fuel atomization (sub-micron droplet size) at pressures ranging from 50-300 psi and flow rates ranging between 0.1-10 gr/sec. We have also demonstrated SI engine cold-start emission reductions when using the Nanomiser Device compared to a conventional electronic fuel injector. More recently, we have shown that the Nanomiser Device can be used to suppress combustion instabilities in gas turbine combustors by controlling the droplet size. At the same time, we have also built injectors to flow 50 g/s that were successfully tested in a high-pressure combustor (500 psi).