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首页> 外文学位 >ANALYSIS OF INJECTION - INDUCED FLOWS IN POROUS - WALLED DUCTS WITH APPLICATION TO THE AEROTHERMOCHEMISTRY OF SOLID - PROPELLANT MOTORS.
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ANALYSIS OF INJECTION - INDUCED FLOWS IN POROUS - WALLED DUCTS WITH APPLICATION TO THE AEROTHERMOCHEMISTRY OF SOLID - PROPELLANT MOTORS.

机译：多孔壁导管中注射诱导流动的分析及其在固体推进剂电机的热化学中的应用。

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摘要

A theoretical analysis of the flow in porous-walled tubes and channels with appreciable injection through the duct wall is presented. Emphasis is placed on flows induced solely from injection by closure of a duct end. Application of the theory to the aerothermochemistry of the solid-propellant rocket motor (viz., the erosive burning problem) is extensively examined. The analysis employs a second-order closure model of turbulence, with single-step gas and condensed-phase reactions utilized to model the combustion of a homogeneous propellant. A finite-difference procedure is used to solve the parabolic equation system.; Theoretical results together with existing experimental data indicate that the flows in porous tubes at large injection Reynolds number can undergo three regimes of flow development, proceeding from the closed head end. In the first regime the velocity field develops in accordance with laminar similarity theory. In the second, high levels of turbulence are developed while the mean velocity field continues to correspond with laminar theory for several radii. The third regime commences with transition (change in shape) of the mean axial velocity distribution, a process occuring at extremely large Reynolds numbers. Factors infuencing the development of the latter regime are assessed. For the reactive flows in solid propellant motors, the results show qualitatively similar flow development with, however, a change in scaling of the mean flow transition process due to combustion. The results for erosive burning are shown to be sensitive to imprecisely-known physical conditions such as surface roughness and the parameters governing the height of the combustion zone, although selection of these parameters within acceptable ranges allows favorable agreement with laboratory motor data. The absence of erosive burning observed in larger motors is theoretically related to the scaling of the erosion threshold condition, and consequently, to the preceding mean-flow transition process. The effects of reaction-rate correlations on erosive burning (combustion-turbulence interaction) have also been investigated. The results show that CTI has a surprisingly negligible effect on the propellant burning rate under erosion conditions, although the effects on mean reaction-rate and thermal transport processes can be substantial.
机译：提出了通过管壁进行明显注入的多孔壁管和通道中流动的理论分析。重点放在仅由于封闭管道末端而由注入引起的流量上。对该理论在固体火箭发动机的空气热化学中的应用（即腐蚀燃烧问题）进行了广泛的研究。该分析采用湍流的二阶封闭模型，利用单步气相和冷凝相反应对均质推进剂的燃烧进行建模。用有限差分法求解抛物线方程组。理论结果和现有的实验数据表明，在大注入雷诺数下，多孔管中的流动可从封闭的头端开始经历三种流动发展方式。在第一种状态下，速度场根据层流相似性理论发展。第二，产生了高水平的湍流，而平均速度场继续与层流理论对应于几个半径。第三种状态从平均轴向速度分布的转变（形状变化）开始，该过程以极大的雷诺数发生。评估了影响后一种体制发展的因素。对于固体推进剂发动机中的无功流，结果显示出在质量上相似的流发展，但是由于燃烧，平均流过渡过程的比例发生了变化。侵蚀性燃烧的结果显示出对诸如表面粗糙度和控制燃烧区高度的参数等不精确已知的物理条件敏感，尽管在可接受范围内选择这些参数可以与实验室电动机数据保持良好的一致性。理论上，在大型电动机中没有侵蚀性燃烧与腐蚀阈值条件的缩放有关，因此与前面的平均流过渡过程有关。还研究了反应速率相关性对侵蚀性燃烧（燃烧-湍流相互作用）的影响。结果表明，尽管对平均反应速率和热传递过程的影响很大，但CTI对侵蚀条件下推进剂燃烧速率的影响却可以忽略不计。

著录项

  • 作者

    BEDDINI, ROBERT A.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Aerospace.; Energy.
  • 学位 Ph.D.
  • 年度 1981
  • 页码 248 p.
  • 总页数 248
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;能源与动力工程;
  • 关键词

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