a Chapter 4 Similarity Principle and Dimensional Analysis 84-1 Introduction Experiment is the basis of developing theories as well as the yardstick of proving theories, sometimes science and technology problems cant be solved without the cooperation of experiments There are mainly two kinds of experiments in engineering fluid mechanic a. model experiment of engineering. For the purpose of forecasting the flow situation of large-scale machine or water power engineering which are being built b exploratory observing experiment. For the purpose of searching unknown flow laws, the theoretical foundation to direct these experiments are similarity principle and dimension analyse5 Chapter 4 Similarity Principle and Dimensional Analysis §4-1 Introduction Experiment is the basis of developing theories as well as the yardstick of proving theories, sometimes science and technology problems can’t be solved without the cooperation of experiments. a. model experiment of engineering. For the purpose of forecasting the flow situation of large-scale machine or water power engineering which are being built. b. exploratory observing experiment. For the purpose of searching unknown flow laws, the theoretical foundation to direct these experiments are similarity principle and dimension analyse. There are mainly two kinds of experiments in engineering fluid mechanics: