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Converging-Diverging Nozzle

In: Science

Submitted By luke81
Words 349
Pages 2
Subject: Converging-diverging nozzle experiment

In this experiment, we used manometers to measure the pressures in the nozzle relative to atmospheric pressure. A water manometer is connected to the inlet pressure tap (P0-P1) and also connected to the throat (P0-P2) and downstream (P0-P3) pressure taps as well. To start this lab we adjusted the flow rate to increase (P0-P3) in equal steps of 2.5 inches of water until the nozzle is choked, which means there is no further increases in (P0-P2) and (P0-P1). For each step, we recorded the readings from all manometers. We did this experiment twice and averaged all readings and calculated the mass flow rate from (P0-P1) assuming incompressible flow in this region and a discharge coefficient of 0.96 after collecting all the data. Then we plotted the mass flow rate vs. (P0-P3) and plot (P0-P2) vs. (P0-P3).
This allowed us to compare the limiting values of throat velocity and pressure ratio (P2/P0) with theoretical values based on isentropic flow and also to find conditions that gave choked flow. We needed to use critical pressure ratio, theoretical critical pressure ratio, and theoretical velocity to help us to find choked flow.
The purpose of this lab is to simulate the operation of a converging diverging nozzle, which perhaps is one of the most important and basic pieces of engineering hardware associated with the high speed flow of gases. This experiment is intended to help engineers of compressible aerodynamics visualize the flow through this type of nozzle at a range of conditions.
We increased step size by 2.5 inches each time until it reached to 40 inches. After we recorded all the data, the choked flow should be around 27.5 inches of water; the manometer started to stop increasing around the reading of 1.88 and the pressure was around 6.24 PSID.
The generally good comparisons of data with theoretical results…...

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