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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Influence of condensation on heat flux and pressure measurements in a detonation-based short-duration facility
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Influence of condensation on heat flux and pressure measurements in a detonation-based short-duration facility

机译：凝结对基于爆炸的短持续时间设施中热通量和压力测量的影响

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摘要

Detonation-based short-duration facilities provide hot gas with very high stagnation pressures and temperatures. Due to the short testing time, complex and expensive cooling techniques of the facility walls are not needed. Therefore, they are attractive for economical experimental investigations of high-enthalpy flows such as the flow in a rocket engine. However, cold walls can provoke condensation of the hot combustion gas at the walls. This has already been observed in detonation tubes close behind the detonation wave, resulting in a loss of tube performance. A potential influence of condensation at the wall on the experimental results, like wall heat fluxes and static pressures, has not been considered so far. Therefore, in this study the occurrence of condensation and its influence on local heat flux and pressure measurements has been investigated in the nozzle test section of a short-duration rocket-engine simulation facility. This facility provides hot water vapor with stagnation pressures up to 150 bar and stagnation temperatures up to 3800 K. A simple method has been developed to detect liquid water at the wall without direct optical access to the flow. It is shown experimentally and theoretically that condensation has a remarkable influence on local measurement values. The experimental results indicate that for the elimination of these influences the nozzle wall has to be heated to a certain temperature level, which exclusively depends on the local static pressure.
机译：基于爆炸的短持续时间设施提供具有非常高的停滞压力和温度的热气体。由于不需要的测试时间短，不需要设施壁的复杂和昂贵的冷却技术。因此，它们对高焓流的经济实验研究（如火箭发动机的流动）有吸引力。然而，冷壁可以在壁上挑选热燃烧气体的冷凝。这已经在爆轰波后面靠近爆炸管中观察到，导致管的性能损失。到目前为止，还没有考虑墙壁对墙壁在墙壁上的潜在影响，如壁热通量和静压。因此，在该研究中，在短持续时间火箭发动机模拟设施的喷嘴试验部分中研究了缩合的发生及其对局部热通量和压力测量的影响。该设施提供热水蒸汽，停滞压力高达150巴，停滞温度高达3800 K.已经开发了一种简单的方法，以检测墙壁的液体水，而不会直接对流动进行直接光学访问。它在实验和理论上显示，冷凝对局部测量值具有显着影响。实验结果表明，为了消除这些影响，喷嘴壁必须加热到一定的温度水平，其专门取决于局部静压。

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