29-03-2012, 03:45 PM
micro fabrication gas turbine
ABSTRACT
As part of an effort to develop a micro gas turbine engine capable of providing 10-50 Watts of electrical power in a package less than one cubic centimeter in volume, we study the fabrication and testing of the first hydrogen combustor micromachined from silicon. Measuring 0.066 cm3 in volume, and complete with a fuel manifold and set of fuel injector holes, the fabrication of the device was largely enabled by the use of Deep Reactive Ion Etching (DRIE) and aligned silicon wafer bonding. The 150 Watt micro combustor has a power density in excess of 2000 MW/m3 and has been successfully demonstrated to provide turbine inlet temperatures up to 1800K.
This topic reports on a research in developing micro power generation system based on gas turbine engine and piezoelectric converter. This micro gas turbine engine consists of a micro combustor, a turbine and a centrifugal compressor. Comprehensive solution has been implemented to optimize the component design. A silicon based micro combustor, which consists of seven layer of silicon structure is studied. A hairpin shaped design is applied to fuel/air recirculation channel. The micro combustor can sustain a stable combustion with an exit temperature as high as 1600 K. I have also studied a micro turbine device which is equipped with enhanced micro air bearing and driven by compressed air at 15,000 rpm.