【摘要】 针对室内空间的低速复杂湍流场,利用LabVIEW开发了一种多点室内湍流测试与特征分析系统,可直接测量并计算出室内气流在时域分析、概率分析、频谱分析和相关性分析中的时序图、平均速度、湍流强度、概率分布直方图、功率密度谱、功率谱曲线β值、自相关、大涡尺度、小涡尺度、湍动能、湍动能耗散、总动能等16种特征指标。通过对一带有机械通风的典型房间的实验测试分析,展示了该系统的测试与分析的功能,验证了特征计算方法的正确性,为评价室内环境和深入分析室内气流结构提供了重要的实用工具。更多还原

【Abstract】 A multi-point measurement system based on Lab VIEW is developed for indoor low velocity complex turbulence,which can directly calculate sixteen kinds of characteristic indexes that are sequence diagram,average velocity,turbulence intensity,probability histogram,power spectral density,power spectrum curve β value,autocorrelation,large eddy scale,small eddy scale,turbulent kinetic energy,turbulent kinetic energy dissipation,total kinetic energy etc in time domain analysis,probabilistic analysis,spectral analysis and correlation analysis.Through the experimental test and analysis of airflow velocity of a typical room with mechanical fan,the applicability of the system is demonstrated and the characteristic calculating method is validated.The system is an utility for the evaluation of the indoor environment and indoor airflow structure analysis.更多还原