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首页> 外文学位 >An Investigation of the Spray Characteristics of Standard and Alternative Fuel Sprays From a Hybrid Airblast Pressure-Swirl Atomizer Operating at Lean Blowout and Chilled Conditions Using Phase Doppler Anemometry
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An Investigation of the Spray Characteristics of Standard and Alternative Fuel Sprays From a Hybrid Airblast Pressure-Swirl Atomizer Operating at Lean Blowout and Chilled Conditions Using Phase Doppler Anemometry

机译：使用相位多普勒风速计研究在稀薄吹气和寒冷条件下运行的混合式高风压旋流雾化器的标准和替代燃料喷雾的喷雾特性

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摘要

Alternative fuel is an area of combustion research gaining increased attention within the aviation industry. These fuels can provide many benefits over standard aviation fuels such as lower prices, supply diversity, and improved emissions. The current focus of alternative fuel research is on producing fuels similar to aviation standards, so that they can be implemented in existing infrastructure and gas turbine engines without significant modification to those systems. These fuels are known as "drop-in" fuels, and undergo an extensive, costly certification process outlined in ASTM D4054-14 in order to be considered suitable for commercial use.;The National Jet Fuels Combustion Program (NJFCP) is conducting research to streamline the ASTM certification process through the use of standard laboratory tests and computer models to determine how the proposed alternative fuels will perform in gas turbine applications rather than costly combustor rig testing. Multiple areas of research are being performed in different areas of the program to accomplish this goal including an area focusing on the atomization of alternative fuels.;This study investigates alternative fuel blends and standard aviation fuels for the NJFCP at a variety of conditions using a hybrid airblast pressure-swirl atomizer to determine the spray characteristics of different fuels. This data is then provided to computer modelers at Stanford University as validation for their models. The sprays were investigated under conditions representative of lean blowout and cold start conditions of a gas turbine engine. For each of these conditions, the injection pressure differential (Delta Ppilot) and pressure drop across the air swirler (Delta P/P) were varied to investigate their effect on the atomization of different fuels. Spray characteristics were measured using phase Doppler particle anemometry (PDA) at three locations downstream from the injector exit: 0.5 inch (12.7 mm), 1.0 inch (25.4 mm), and 1.5 inch (38.1 mm).;The study found that the DeltaPpilot had no significant effect on the spray produced by the hybrid atomizer for any fuel. The swirler pressure drop DeltaP/P was observed as having a significant effect on the spray. Increases in Delta P/P resulted in significant decreases in droplet size and increases in velocity magnitude throughout the spray for all fuels. Comparison of the fuels found that some differences occurred between the alternative fuels and the aviation standard fuels depending on the location within the spray and the operating conditions. Overall the standard and alternative fuels produced sprays similar to each other. Spray characteristics were obtained along multiple planes downstream of the injector exit. Comparison of the characteristics on these planes showed that the largest drops in the spray continue to spread radially outward as they travel further downstream from the injector exit. Secondary atomization was also investigated. It was found that, if secondary atomization occurs, it must be at a location closer to the exit of the injector than the 0.5 inch (12.7 mm) plane.
机译：替代燃料是燃烧研究的一个领域，在航空工业中越来越受到关注。与标准航空燃料相比，这些燃料可提供许多好处，例如价格更低，供应多样化以及排放得以改善。当前替代燃料研究的重点是生产类似于航空标准的燃料，因此无需对这些系统进行重大修改即可在现有基础设施和燃气涡轮发动机中实施这些燃料。这些燃料被称为“即插即用”燃料，并经过ASTM D4054-14概述的广泛，昂贵的认证过程，以便被认为适合商业用途。国家喷气燃料燃烧计划（NJFCP）正在进行研究通过使用标准的实验室测试和计算机模型来简化ASTM认证过程，从而确定拟议的替代燃料在燃气轮机应用中的性能，而不是进行昂贵的燃烧器试验。为了实现该目标，计划的不同领域正在进行多个研究领域，其中一个领域是替代燃料的雾化。本研究使用混合动力车在各种条件下研究了NJFCP的替代燃料混合物和标准航空燃料鼓风压力旋流雾化器确定不同燃料的喷雾特性。然后，将这些数据提供给斯坦福大学的计算机建模人员，以验证其模型。在代表燃气涡轮发动机的稀薄喷出和冷启动条件的条件下研究了喷雾。对于这些条件中的每一种，都改变了喷射压差（Delta Ppilot）和整个空气旋流器的压降（Delta P / P），以研究它们对不同燃料雾化的影响。使用相位多普勒粒子风速计（PDA）在喷油器出口下游的三个位置测量了喷雾特性：0.5英寸（12.7毫米），1.0英寸（25.4毫米）和1.5英寸（38.1毫米）。研究发现，DeltaPpilot对于任何燃料，混合雾化器产生的喷雾均无明显影响。观察到旋流器压降DeltaP / P对喷雾有显着影响。 Delta P / P的增加导致所有燃料在整个喷雾过程中液滴尺寸显着减小，速度幅度增大。燃料的比较发现，代用燃料和航空标准燃料之间存在一些差异，具体取决于喷雾中的位置和操作条件。总体而言，标准燃料和替代燃料产生的喷雾彼此相似。沿喷射器出口下游的多个平面获得了喷雾特性。在这些平面上的特性比较表明，喷雾中最大的液滴随着它们从喷油器出口向下游移动而继续沿径向向外扩散。还研究了二次雾化。已发现，如果发生二次雾化，则它必须位于比0.5英寸（12.7毫米）平面更靠近喷油器出口的位置。

著录项

  • 作者

    Bokhart, Andrew J.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Aerospace engineering.
  • 学位 M.S.A.A.
  • 年度 2017
  • 页码 202 p.
  • 总页数 202
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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