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首页> 外文会议>AIAA aerospace sciences meeting;AIAA SciTech Forum >Effect of Aviation Fuel Type and Fuel Injection Conditions on Non-reacting Spray Characteristics of a Hybrid Airblast Fuel Injector
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Effect of Aviation Fuel Type and Fuel Injection Conditions on Non-reacting Spray Characteristics of a Hybrid Airblast Fuel Injector

机译：航空燃料类型和燃料喷射条件对混合式大爆炸燃料喷射器非反应喷雾特性的影响

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Injector spray characteristics have a significant influence on the combustion performance in a gas turbine engine, including an impact on dynamics, emissions and component life. Furthermore, commercial aviation faces fuel cost, environmental, and energy security challenges that arise from the use of petroleum based jet fuels. Sustainable alternative jet fuels can help address these challenges and need to be characterized in their spray performance. The present work describes the detailed characterization of several alternative fuels using a hybrid airblast atomizer on the basis of spray shape, droplet size and velocity distribution at a range of operating conditions including fuel temperature, injector pressure drop and spray chamber pressure and temperature. The characterization is done using optical pat-ternation, phase Doppler anemometry (dual-PDPA) and high speed back-lit imaging. The measurements obtained as part of this work provide the validation data-set for computational modeling of the spray behavior which forms a critical part of the broader project. The results show a strong influence of the fuel temperature on the spray, with lower temperature (290 K to 240 K) decreasing the atomization quality by 14%, while the effect of fuel injection pressure on the spray is minimal. A large effect of pressure drop across the injector is seen on the spray, with a change from 2% to 6% leading to a decrease in drop size of up to 36%, which can result of a shift in the secondary breakup regime of the spray.
机译：喷射器的喷雾特性对燃气涡轮发动机的燃烧性能具有重大影响，包括对动力，排放和部件寿命的影响。此外，由于使用基于石油的喷气燃料，民用航空面临着燃料成本，环境和能源安全方面的挑战。可持续的替代喷气燃料可以帮助应对这些挑战，并需要在其喷雾性能上加以表征。本工作基于混合形状的鼓风雾化器，基于在包括燃料温度，喷射器压力降以及雾化室压力和温度在内的一系列工作条件下的喷雾形状，液滴尺寸和速度分布，描述了几种替代燃料的详细特性。使用光学图案，相位多普勒风速计（dual-PDPA）和高速背光成像来完成表征。作为这项工作的一部分而获得的测量结果为喷雾行为的计算建模提供了验证数据集，这是更广泛项目的关键部分。结果表明，燃料温度对喷雾的影响很大，较低的温度（290 K至240 K）使雾化质量降低14％，而燃料喷射压力对喷雾的影响最小。在喷雾器上看到喷油器两端的压降影响很大，从2％变为6％，导致液滴尺寸减小多达36％，这可能会导致喷雾器的二次破碎状态发生变化。喷。

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