Consider an airfoil in a wind tunnel (i. e., a wing that spans the entire test section). Prove that the lift per unit span can be obtained from the pressure distributions on the top and bottom walls of the wind tunnel (i. e., from the pressure distributions on the walls above and below the airfoil). For this problem, assume that the pressure distributions on the upper and lower walls of the wind tunnel are pu(x) and pl(x), respectively. They are functions of the x-coordinates. You will need to apply the momentum equation in integral form in the y-direction.

Step-by-step explanation:

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introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.