【比利时鲁文,2009】Precision manufacturing of key components for an ultra.pdf

Microsyst Technol DOI 10.1007/s00542-009-0897-z TECHNICAL PAPER Precision manufacturing of key components for an ultra miniature gas turbine unit for power generation Kun Liu Æ Tobias Waumans Æ Jan Peirs Æ Dominiek Reynaerts Received: 3 April 2009 / Accepted: 30 June 2009 Springer-Verlag 2009 Abstract Advanced and precise manufacturing is unmanned aerial vehicles, autonomous robots and other presented for two key components: a compressor and a mobile devices in military. Despite recent advances in turbine impeller (Ø 20 mm) for an ultra miniature gas battery technology, the gap between the required and turbine system as fuel-based power generation system. The available power is still increasing. Hydrocarbon fuels total system fits in a cylinder with a diameter of 110 mm burned in air have 20–30 times the energy density of the and a length of 120 mm. At this scale, major components best current lithium chemistry-based batteries, so that such as turbine and compressor are subjected to challenging fuelled devices with moderate size and modest efficiency requirements such as high rotational speed (500,000 rpm), can bridge the gap. Given the need for high power density high turbine inlet temperature (1,200 K) and efficiency. The energy conversion in very small packages, a millimetre- choices of material and manufacturing technique are criti- scale gas turbine is an obvious candidate. Because this cal. The components must endure the operational require- concept was first explored in the mid 1990s, two different ments and should be fabricated in high accuracy. In order to turbine size ranges are mainly investigated: a micro-range withstand the high centrifugal stress, a high-strength t