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Developing an Application for Refractory Open Cell Metal Foams in Jet Engines

机译:开发喷气发动机难治性开放式电池金属泡沫的应用

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The thermodynamic efficiency of the Brayton cycle, upon which all gas turbines (aeropropulsion and power generation) are based on scales with the peak operating temperature. However, the peak temperature is limited by the turbine blades and the temperature they can withstand. The highest temperatures in the gas turbine occur in the combustor region but these temperatures are often too high for turbine blades. As a result, the combustion products must be diluted with relatively cooler air from the compressor to reduce the temperature to tolerable levels for the turbine blades. This research suggests placing a ring of high temperamre open cell metal foam between the coinbustors and turbine sections of the jet engine to mix and average the difference in temperatures resulting from the cooling schemes in combustor cans. Temperature mixing effect was tested using a special setup with the application of an infrared camera and streams of hot and cold air passing through the foam. High speed flow pressure drop around Mach 1 (340 m/s) was done on the same foam samples to understand pressure drop in the compressible regime of air. Infrared imaging showed that open cell metal foams successfully mixed and averaged the difference in temperatures of the hot and cold gasses thus creating a more uniform temperature profile while pressure drop testing revealed that open cell metal foams result in minimal pressure drop at high flows especially when the increase in temperature in taken into consideration.
机译:Brayton循环的热力学效率,所有燃气轮机(航空舒张和发电)基于具有峰值工作温度的尺度。然而,峰值温度受涡轮机叶片的限制和它们可以承受的温度。燃气轮机中的最高温度发生在燃烧器区域中,但是对于涡轮叶片而言,这些温度通常太高。结果,燃烧产物必须从压缩机的相对较冷的空气中稀释,以将温度降低到涡轮叶片的耐受水平。该研究表明,在喷气发动机的卷轴和涡轮机部分之间放置一圈高温开通电池金属泡沫,以混合和平均由燃烧器罐中的冷却方案产生的温度差异。使用特殊设置测试温度混合效果,其应用红外摄像头和通过泡沫的热和冷空气流。在同一泡沫样品上进行高速流量压降(340m / s),以了解空气可压缩制度中的压降。红外成像表明,开放式电池金属泡沫成功混合并平均热和冷气体温度的差异,从而产生更均匀的温度曲线,而压力下降测试显示开放电池金属泡沫,特别是当考虑到温度的增加。

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