Proof of Concept in Pressure Correlation Measurement in Turbulent Flows (Expedited Award for Novel Research)

湍流预混流中应力和标量的输运 火焰很难预测，因为它们之间的相互作用 控制参数的空间和时间波动。 动态建模需要消除 运动方程 一组难以捉摸的参数包括压力- 速度波动 这项研究将集中在一种技术上， 测量等温流动中的这些波动， 非侵入式激光方法（多光束、激光多普勒风速测量法 和瑞利散射）用于侵入式机械麦克风探头。 压力波动将不会直接测量，但将 根据密度-速度的体积积分计算 梯度。 拟议的研究涉及压力波动测量， 等温射流 可重复的定量结果， 高精度将导致在反应射流中进行类似的测量， 进一步加深我们对湍流的理解， 燃烧模型的科学基础。

The transport of stress and scalar quantities in turbulent premixed flames is difficult to predict because of the interaction between spatial and temporal fluctuations of the controlling parameters. Modeling the dynamics requires elimination of troublesome terms in the equation of motion. One set of elusive parameter involves pressure- velocity fluctuations. The research will focus on a technique to measure these fluctuations in isothermal flows by substituting nonintrusive laser methods (multiple-beam, laser-doppler anemometry and Rayleigh scattering) for intrusive mechanical microphone probes. The pressure fluctuations will not be measured directly but will be calculated from the volume integration of the density-velocity gradients. The proposed research deals with pressure fluctuation measurements in an isothermal jet. Quantitative results which are repeatable and of high accuracy will lead to similar measurements in reacting jets, will further our understanding of turbulence, and will increase the scientific basis for combustion modeling.