Senior Design Project

Oct 02, 2008

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by: Anonymous

I'm sorry, I thought that the Q/A was to a direct email, not an online sharing tool. I have no problem with giving out my email: nomisst@comcast.net.

I would really appreciate if you could drop me an email so that I can keep you updated and informed.

The level of PSI is not the problem. Yes, Mach 1 would be the speed of sound, we want to achieve a level of Mach 3 in our design.

The amount of PSI is not the issue, the issue is that we are in trouble of finding a cheap compressor that could dish out a consistent level of whatever psia we need for about 15 seconds with no pressure drops so that the supersonic flow is constant. This is all based on the design of our flow vessel which we are currently figuring out which design would be the most efficient and least costly.

The members of my team are all working on different tasks and first I need the theory (done by the team leader) worked out on what specs we will need in order to achieve Mach 3 and so far his data has been 50psia, but this could be incorrect so we need to continue working on the theory.

However, if 50psia is really the pressure that we need in order to achieve super sonic speed in that vessel than I need to find a compressor that can do this within our budget.

Response to comment:

Simon, good that you know that you need 50 PSIA.

You still need to know the flow you need at that pressure.

Almost every low cost compressor will give you 100+ PSI in the reservoir.

With the use of a good quality (Precision) regulator, you'll be able to hold the downstream pressure to within 1/2 - 1 PSI. If you need more accurate pressure control than that, you'll need a really good quality regulator, moving out of the general purpose realm and into the precision instrument arena.

So, if the cheapo compressor gives you your 50 PSIA, and the flow you need is low, and you get a really good precision regulator to give you the accurate downstream pressure you need, then the only thing left is to find out how much flow. How many CFM? The lower that number, the smaller and lower cost your compressor can be.

Bill

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Oct 02, 2008
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Submitted by: Anonymous

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I'm sorry, I thought that the Q/A was to a direct email, not an online sharing tool. I have no problem with giving out my email: nomisst@comcast.net. I would really appreciate if you could drop me an email so that I can keep you updated and informed. The level of PSI is not the problem. Yes, Mach 1 would be the speed of sound, we want to achieve a level of Mach 3 in our design. The amount of PSI is not the issue, the issue is that we are in trouble of finding a cheap compressor that could dish out a consistent level of whatever psia we need for about 15 seconds with no pressure drops so that the supersonic flow is constant. This is all based on the design of our flow vessel which we are currently figuring out which design would be the most efficient and least costly. The members of my team are all working on different tasks and first I need the theory (done by the team leader) worked out on what specs we will need in order to achieve Mach 3 and so far his data has been 50psia, but this could be incorrect so we need to continue working on the theory. However, if 50psia is really the pressure that we need in order to achieve super sonic speed in that vessel than I need to find a compressor that can do this within our budget. <br /> <hr /> <br /> Response to comment: Simon, good that you know that you need 50 PSIA. You still need to know the flow you need at that pressure. Almost every low cost compressor will give you 100+ PSI in the reservoir. With the use of a good quality (Precision) regulator, you'll be able to hold the downstream pressure to within 1/2 - 1 PSI. If you need more accurate pressure control than that, you'll need a really good quality regulator, moving out of the general purpose realm and into the precision instrument arena. So, if the cheapo compressor gives you your 50 PSIA, and the flow you need is low, and you get a really good precision regulator to give you the accurate downstream pressure you need, then the only thing left is to find out how much flow. How many CFM? The lower that number, the smaller and lower cost your compressor can be. Bill

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