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首页> 外文会议>AIAA/ASME/SAE/ASEE joint propulsion conference exhibit >Experimental comparison of Dual Bell and Expansion Deflection Nozzles
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Experimental comparison of Dual Bell and Expansion Deflection Nozzles

机译：双钟形和膨胀偏转喷嘴的实验比较

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摘要

Replacing conventional bell nozzles with altitude compensating forms represents an attractive proposition for launch vehicle design, as both efficiency across the altitude range and altitude performance, through the use of larger area ratios, may be increased. This paper compares the performance of two such compensating nozzle types, the Expansion Deflection and Dual Bell, through a series of cold flow tests conducted at nozzle pressure ratios encompassing the entirety of the compensating regime. Nozzle efficiencies are shown to vary significantly across the pressure ratio range. Furthermore, relatively small changes in some design parameters associated with the ED nozzle type are shown to have an effect on overall performance. Despite this, the compensating behaviour of the type is shown to have similar potential to that of the Dual Bell. Combined with its other advantages of shorter length and potentially more adaptable design principles, it appears to show promise for application to future launchers.
机译：用高度补偿形式代替传统的钟形喷嘴代表了运载火箭设计的一个有吸引力的主张，因为通过使用更大的面积比，可以提高整个高度范围内的效率和高度性能。本文通过在包含整个补偿方案的喷嘴压力比下进行的一系列冷流测试，比较了两种补偿喷嘴类型（膨胀挠度和双钟形）的性能。喷嘴效率在整个压力比范围内显示出显着变化。此外，显示出与ED喷嘴类型相关的一些设计参数的相对较小的变化会影响整体性能。尽管如此，该类型的补偿性能仍显示出与双铃类似的潜力。结合其较短的长度和潜在的更适应设计原理的其他优点，它似乎显示出可应用于未来发射器的希望。

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