How is Flow Function Calculated with this setup? (Novice)
[COLOR=#333333][FONT=Lucida Grande]Hi there,[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]I am an apprentice at my place of work and my supervisor has put me in the airflow side of the business as an operator.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]The airflow rig that we have is a Flow Systems one. I just want to know how [/FONT][/COLOR][COLOR=#333333][FONT=Lucida Grande][I]exactly[/I][/FONT][/COLOR][COLOR=#333333][FONT=Lucida Grande] it works? So, dumb questions are following.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]We measure the Flow Function of the parts. What does this actually represent physically? How is it different to Mass Flow?[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]I understand that the flow goes through a venturi tube which becomes choked when it hits the speed of sound, which eliminates fluctuations with changes downstream to the venturi tube. However, it's upstream i have the problems with.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]The flow then goes through nozzles. What happens here? Do they speed up the velocity of the air? Why? All i know is that the nozzle choice depends on the flow. The air eventually reaches a plenum chamber where the flow comes to rest. There is a pressure tapping in the chamber and air then 'leaks' through the part at the top of chamber. [/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]All i know is that the pressure ratio is set to 1.4. What exactly is the pressure ratio between?[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]My final question. What is the whole rig measuring [/FONT][/COLOR][COLOR=#333333][FONT=Lucida Grande][I]actually[/I][/FONT][/COLOR][COLOR=#333333][FONT=Lucida Grande] measuring to calculate the flow function? I haven't been able to find this out.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]I realize that these are dumb questions, but once i know exactly how something is working, and more importantly why, I can apply logic to the whole rig.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]Thanks in advance.[/FONT][/COLOR]
[COLOR=#333333][FONT=Lucida Grande]Steve[/FONT][/COLOR]