Acquisition of Advanced Instrumentation for Research in Turbulence, Chaos, Combustion and two-Phase Flows

摘要CTS-9413798 Fazle Hussain将开发一种连贯的、多用途的测量系统，以应对未来在一些主要流体动力学领域的挑战。该仪器将有助于研究湍流现象的结构、动力学和控制，包括两相和自由表面流动，利用：(I)粒子图像测速(PIV)，(Ii)多点涡量和压力测量，以及(Iii)数据处理。第一个系统组件由激光器、摄像机、帧数字化、粒子大小和实现电影全息粒子测速(Cine HPV)和数字PIV所需的高速计算设备组成。第二个组件系统包含一个128通道数据采集系统(具有16位分辨率、低噪声和高达100 kHz/通道的采样率)和实时信号分析器。第三个系统组件主要由图形工作站组成，用于分析通过(I)和(II)获得的三维速度场和涡量场以及数值模拟。休斯顿大学空气动力学和湍流实验室(ATL)在流体力学和相关主题(如相干结构动力学、湍流管理、明流中的混沌、涡旋重联和核心动力学、半球麦克风阵列、相干结构教育)方面都有基础和应用研究。实验和数值技术的结合被用来解决各种问题：(I)CS在自由剪切流中的性质和动力学意义，包括它们的角色转换、卷吸混合和燃烧；(Iii)涡旋重联在湍流叶栅中的作用。这里的一个主要推力是实现电影HPV，它可以提供时间分辨的、三维速度、涡度和温度场数据。基于HPV的时间分辨流场测量技术是未来最有前途的流量测量技术。新仪器将实现电影HPV，以高达1千赫的速度捕获不断演变的流场。此外，速度和压力测量将用于研究技术浮选中的CS动力学，开发创新的数值模拟技术(基于小波的大涡模拟)，并详细分析湍流现象。这些仪器的使用不仅将增进我们对流动物理的理解，还将培训研究生和研究人员掌握最先进的测量技术，从而为进一步的创新铺平道路。这些仪器将主要由ATL的研究人员使用，但也将供工程、数学和物理的研究人员使用。***

ABSTRACT CTS-9413798 Fazle Hussain A coherent, multi-purpose measurement system to address the future challenges in a number of major areas of hydrodynamics will be developed. The instrumentation will help studies about the structure, dynamics and control of turbulence phenomena, including two-phase and free surface flows, utilizing: (i) particle image velocimetry (PIV), (ii) multipoint vorticity and pressure measurements, and (iii) data processing. The first system component consists of lasers, cameras, frame digitizes, particle size and high-speed computational equipment necessary to implement cine holographic particle velocimetry (cine HPV) and digital PIV. The second component system contains a 128-channel data acquisition system (with 16-bit resolution, low noise and sample rates up to 100 kHz/channel) and real-time signal analyzers. The third system component consists primarily of a graphics workstation for analysis of 3D velocity and vorticity fields obtained via (i) and (ii) and also numerical simulation. The Aerodynamics and Turbulence Laboratory (ATL) at the University of Houston has both fundamental and applied studies in hydrodynamics and related topics (e. g. dynamics of coherent structures (CS), turbulence management, chaos in open flows, and vortex reconnection and core dynamics, hemispherical microphone arrays, CS education). Combination of experimental and numerical techniques have been used to address various topics: (i) the nature and dynamical significance of CS in free shear flows, including their role transition, entrainment mixing and combustion, and (iii) the role of vortex reconnection in turbulence cascade. A major thrust here is implementing cine HPV, which can provide time-resolved, 3D velocity, vorticity and temperature field data. A time-resolved flow field measurements techniques using HPV is the most promising future flow measurement technology. The new instrument will implement cine HPV, capturing evolving flow fields at rates up to 1 kHz. In addition, the velocity and pressure measurements will be applied to study CS dynamics in technological floes and develop innovative numerical simulation techniques (wavelet-based large-eddy simulations) and to analyze in detail turbulence phenomena. The use of these instruments will not only advance our understanding of flow physics but also train graduate students and researchers in state-of-the-art measurement techniques, thus paving the way for further innovations. These instruments will be used primarily by researchers at ATL but will also be available to researchers in engineering, mathematics and physics. ***