A preliminary study was conducted f o determine the f e a s i b i l i t y of using heat pipes i n a nuclear a i r c r a f t propulsion system. the sole transporter of heat. heat pipe systems were used. heat from the reactor. Another transferred the heat t o the a i r i n the j e t engine. Conceptural designs of t h e reactor, engine, and reactor t o e ine heat pipes a r e presented and the amount of U2% required f o r c r i t i c a l i t y i s estimated. a r e defined: wick pore size, wick thickness, heat pipe diameter and length, vapor flow area, a x i a l and r a d i a l heat flux; and temperatures of liquid, vapor, and s t r u c t u r a l materials. The factors t h a t l i m i t the heat pipe performance or d i c t a t e the design a r e identified. Design features t h a t s t r e t c h the state-of-the-art a r e pointed out.
This paper evaluates the basic feasibility and anticipated benefits to using heat pipe technology to cool the turbine vanes of gas turbine engines.
This concept involves fitting out the vane interior as a heat pipe, extending the vane into an adjacent heat sink and then transferring the vane incident heat through the vane to the heat sink. The baseline is an advanced military fighter engine and the bypass air is the chosen heat sink. The results of this study show a 7.2% increase in engine thrust, a 0.2% decrease in specific fuel consumption with engine weight increased by less than 1% by using this technology.
In a self-cooled drill, an especially designed bur is used to transport heat generated at the cutting edge into the handpiece, where it is dissipated into an air heat sink. The bur contains a sealed cavity partially filled with water, which transports heat via the principle of rotating heat pipe technology. The heat transport capability of burs fitted out as rotating heat pipes was established. A conceptual design for a representative bur was prepared, based on surgical drill sculpting criteria. It appears that a self-cooled surgical drill for sculpting can limit bone temperatures below levels for the initiation of thermal damage in bone, nerve, and brain tissue, without the need to employ an externally applied coolant.
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