双层百叶风口等温自由射流的PIV实验研究与数值模拟

发布时间：2018-03-05 07:10

本文选题：计算流体力学　切入点：粒子速度成像技术　出处：《天津商业大学》2013年硕士论文　论文类型：学位论文

【摘要】：送风口入流条件对空调房间内的气流状况影响极大，等温自由射流理论是室内空调通风气流组织设计的基础。一般的射流理论公式是用来计算射流主体段的规律，而介于射流初始段和主体段之间的过渡段，，没有统一的规律。本文采用粒子图像测速仪对双层百叶风口等温自由射流流场的过渡段进行了实验可视化研究，比较了张角为45°和垂直出流（张角为90°）的流场，结果表明张角为90°的风口流速比张角为45°的大10%；应用ANSYS CFX对流换热模拟软件对双层百叶风口的等温射流的流场进行了模拟，比较了多种求解格式（高精度格式、迎风格式）和多种湍流模型（标准k-ε模型、Shear Stress Transport模型）下的模拟结果。数值计算和实验结果对照研究表明：在迎风求解格式下，采用标准k-ε湍流模型和Shear Stress Transport的湍流模型，模拟结果和实验值吻合；而利用高精度格式求解，模拟失真，其原因还有待研究。
[Abstract]:Air condition air inflow conditions on the air conditioning room has great influence, isothermal jet theory is the basis of indoor air conditioning and ventilation design of airflow jet. The general theoretical formula is used to calculate the jet body section of the law, and between the initial jet section and the main section of the transition section, there is no unified rules. This paper uses the transition a particle image velocimetry of double-layer louver isothermal free jet flow field is studied experimentally visualized, compared the angle is 45 degrees and vertical flow (angle 90 degrees) the results show that the air flow field, velocity angle of 90 degrees to 45 degrees angle than 10%; flow field using ANSYS CFX convection heat transfer isothermal simulation software jet on the double shutter of the simulation, comparison of many schemes (high accuracy scheme, upwind) and various turbulence models (standard k- model, Shear Stress Trans The simulation results under the port model). The numerical and experimental results show that: in the control study of solving upwind format, turbulence model using standard k- turbulence model and the Shear Stress Transport, the simulation results were consistent with experimental values; and using the high accuracy scheme for simulation, distortion, the reason remains to be studied.

【学位授予单位】：天津商业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831

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