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What is the shortcoming of analysing flow properties using quasi-one-dimensional analysis?

What is the shortcoming of analysing flow properties using quasi-one-dimensional analysis? Correct Answer No information on wall contours of nozzle

Flow properties at any section of the nozzle can be predicted by the quasi-one-dimensional analysis. It represents the average flow quantities. There are two major shortcomings of using this analysis. First being that it does not predict the three-dimensional flow in convergent-divergent nozzle and secondly, it does not provide us with the information of wall contours in the nozzle.

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