Questions tagged [compressed-air]

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Inquiry about a real image or a 3D image of an engineering device

I am a researcher in applied mathematics. I am studying a diagram of an engineering device "Summer air-conditioner for hot and dry weather" and looking for real pictures of it or a three-...
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1 vote
43 views

How to find the stroke and bore of a tractor engine

Given that a 4-stroke and 4-cylinder diesel engine have a ratio between its stroke and its bore as 6:5. The engine operating at 2000 rpm uses 7.5 liters of fuel and 240 kilo liters per hour of air. ...
1 vote
50 views

Can supersonic flow be achieved without converging diverging nozzle?

Can supersonic flow be achieved without the presence of a converging diverging nozzle if sufficient pressure difference is available? https://www.tomshardware.com/desktops/pc-building/an-ordinary-...
1 vote
91 views

Can air velocity be supersonic in a straight pipe?

Consider a sufficiently large reservoir of compressed air at a pressure of $7 \text{ bar}$ (abs.). A tapping of $25 \text{mm}$ diameter of pipe length $1 \text { m}$. The pipe is open to the ...
1 vote
34 views

How to handle saturated hot air at the inlet of a blower

I have hot (around 60°C) saturated air entering a side channel blower. Due to process constraints, I can't use a condenser or air dryer (such as desiccant) at the blower inlet. However, water vapor ...
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77 views

Calculate volume of compressed air tank given several variables

For context, I've started drafting an idea for a submarine simulator game, and I want to make as realistic as possible; but this obviously requires doing a lot of math that I'm unfamiliar with. I've ...
14 views

How to handle air pressure circuit with very different setpoint values

I'm a hw/sw guy, with a very limited knowledge about pressure/pneumatic circuits. For my new job I have to design a closed-loop controller to inflate and maintain two chambers with a given pressure. ...
• 101
19 views

I would like to know about the composition of a compressed air system

I am a graduate student and I am planning to conduct high-speed flow experiments using a high-pressure tank. The equipment we currently have is a compressor, air tank, and regulator, and the regulator ...
1 vote
125 views

Why are double-acting reciproating compressors more efficient than single-acting ones?

On many websites, I read that double-acting reciprocating compressors are more efficient than single-acting compressors. These sources say it's because they complete two compression cycles on each ...
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How much air pressure is needed to push liquid out of a tank

I want to use compressed air to push diesel out of a 100 gallon rectangular tank for fueling equipment. Tank is 24” tall with a 30’ 3/4” hose reel on top. Height of the nozzle would be 6’ ft from the ...
332 views

Pros and Cons of Carbon Fibre High Pressure Tank

What are the advantages and disadvantages of using carbon fibre for pressure vessel construction? Carbon fibre has a very high tensile strength and is very light-weight. According to this calculator ...
26 views

Would there be a flame front in this case of combustion

Suppose a piston enclosing an amount of air-fuel mixture and then this piston compresses the mixture to the point of auto ignition, if every part of the mixture ignite simultaneously is it safe to say ...
49 views

Piston Compressed Pneumatic Cannon

During an discussion with friends regarding pneumatic cannons, I came up with this gem :). Piston power pneumatic cannon. My friends however, didn't share my excitement regarding this revolution in ...
43 views

Why is there a MIN and MAX marking on a car coolant bottle?

This question was initially posted in physics stack exchange, then the mechanics stack exchange but I think it's more appropriate for engineering section instead. I've always thought the minimum and ...
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1 vote
95 views

How long it takes to fill an inflatable to a certain pressure?

I am trying to figure out the inflation/how to calculate the time it takes to fill something to a certain pressure. I have an inflatable dock I am filling with a portable pump. The dock is 7ft x 7ft x ...
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198 views

Can Vortex tubes be used in cooling rooms?

Vortex tubes have been used extensively to some extent in cooling small areas. However, can they be used to cool larger rooms. Through some research, I found out that an average vortex tube may take ...
1 vote
264 views

Can air compressors be used to boil water?

I was just reading an article about how air compressors can be used as an energy source. As the air is compressed, its temperature increase significantly, and this energy stored as heat can be used to ...
• 121
1 vote
36 views

A 40L compressed air cylinder at 100 bar is emptied in pulses at the rate of 41kg/s. How many such cycles would it take to empty the cylinder? [closed]

I am constructing a blowback gas system where clogged debris needs to be removed with compressed air using compressed air cylinder. 40L compressed air cylinder at 100bar pressure is available as ...
45 views

Pneumatic pressure sensing in a moving air compressor line

I am building an automatic control system for an compressor that stops at a designated pressure. Here's a rough sketch of the system: The compressor should receive the on signal from the ...
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159 views

Question about oblique shock and expansion fans

Hi I am an engineering student. I have a question about oblique shock and expansion fans. In my understanding, oblique shock and expansion fans could happen on supersonic airplane foil. But how often ...
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139 views

Releasing compressed air with the loudest pop

Due to the dry summer I've been thinking about theory of making cracker/banger without fire. Would connecting a nozzle (de Laval?) to quick release valve from small cylinder with the pressurised air ...
5k views

Why are train brakes so complicated?

The concept is simple enough: no pressure in the train line has the brakes locked, full pressure is loose, and partial pressure drags accordingly. So if pressure is lost for any reason, the train ...
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132 views

Is there a good way to passively dry air in the input of a vacuum pump?

I'm using an a/c compressor as a vacuum pump for small projects that don't need a good vacuum pump, and I'm looking for a way to dry the air in the input, to prevent water from mixing with the oil ...
• 121
32 views

Air Filtering using a Air Tank

I just got a theory, However I don't know if it would work the way I wanted it to, though I still have hope and want to see if you agree with me. As we all know, CO2 Slowly sinks as it is heavier than ...
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1k views

Out of the three types of Stirling Engines, which one is the most efficient and delivers the most amount of power?

I was thinking that the beta Stirling engine would be the most efficient as it has a displacer to block heat transfer from the hot to cold regions in between thermodynamic cycles. However, I heard ...
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1 vote
57 views

What's the most efficient air compressor to reliably deliver up to 15 litres per second at 10 bar? [closed]

Suppose I wanted to continuously supply up to 15 litres of air per second, compressed to 10 bar - what would be the most efficient type of compressor, i.e. the type requiring the least energy input in ...
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1 vote
203 views

How to calculate rock permeability in m^2 from gas flux in m/s?

I am studying rock caverns lined with concrete for compressed air storage. I would like to know if it's possible to convert the permeability coefficient from m/s to m^2 or Darcy. Thank you.
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473 views

Specific heat at constant volume used in non constant volume processes

I have commonly seen that the work for an isentropic compression is written as: $$W_{in} = c_{v}(T_1 - T_2)$$ What confuses me is that since it is a compression (volume is changing) why do we use ...
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1 vote
894 views

Is using your mouth and lungs to blow away dust inside your computer somehow bad for the computer?

Bottles of compressed air are very expensive where I live. While it would be nice and ideal to have and do a "proper" cleaning, I've always used my mouth and lungs to blow air onto the dust ...
78 views

Is there a miniture atmospheric water vapor condenser?

I am looking to add a condenser for a plant preserving container. The plants need water and I was wondering if I can have a passive method to condense atmospheric moisture to water. My container is ...
25 views

Can't Find Regulator for 16G CO2 Cartridge (800 PSI to 400-200PSI)

I am trying to make a Paintball Gun that works off of 16G CO2 Cartridges(800 PSI). I can't find a compact regulator that drops 800 PSI down to 400-200 PSI. If anyone knows of such a regulator could ...
1 vote
31 views

Why does use with air or water reduce the maximum temperature of certain high temperature / pressure hoses?

This example is a Parker Hannifin model 426/436 "SAE 100 R1 AT / SAE 100 R16 High Temperature Hose". Here are the temperature specifications: (Full data sheet) Although there is an asterisk ...
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How to make a 500+ psi water gun staff

I would like to create a life size lego Bionicle Aqua axe(gali nuva Type or gali master of water Type). The problem is unlike The trident in this video: https://m.youtube.com/watch?v=NK6MWt7vpVE&t=...
79 views

What is the maximum temprature that could be achieved by compressing air?

We know that compressing air produces heat but is it possible to achieve temprature of 700degree C just by compressing air. If not what will be the maximum temprature that could be achieved?
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Why air compressing mechanism "Trompe" is not popular in usage?

I was amazed when I got to know that there is such a simple mechanism know as Trompe to compress air. It has no moving parts which make it cheap to construct and do not require any servicing. Even the ...
• 87
59 views

Slow Driving an Air Compressor

Do off-the-shelf air compressors have minimum driving speeds, below which they cannot build the necessary pressure? Reciprocating compressors and scroll compressors are available—is there a difference ...
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Why do high pressure multistage air compressor have different piston diameter sizes? [closed]

I meant like this kind of compressor https://www.bauer-kompressoren.de/fileadmin/_processed_/csm_compressor-block-junior2_b92a76a02e.jpg also would the compressor reach high pressure if the diameter ...
3k views

Is it safe to use a 125PSI rated auxiliary air tank with a 150PSI air compressor?

I have a small, 5 gallon, pancake compressor which has a maximum 150PSI rating. Unfortunately, it doesn't have the air capacity to power the demands of an HVLP paint sprayer or a die grinder without ...
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58 views

How to decrease Nitrogen gas consumption in Iron & Steel Plant? [closed]

I need to decrease nitrogen gas consumption in iron & steel plant. Currently it's not possible to measure every dot from steel mill to determine real usage so they use what air separation unit ...
631 views

Is it possible to connect a car air compressor to a blow out gun?

I have a compressor with this type of outlet: I am not sure how it is called, but it works for my bicycle and car. Then I have a blow out gun to clean electronics by a stream of compressed air. The ...
222 views

Regarding design of a compressed air delivery system based on a screw air compressor

I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
200 views

How far can we compress air manually?

I am not sure if such devices even exist, but I'm sure we can improvise. A device in which we could (manually) turn a shaft, screw a screw, or hammer an air-tight follower into a strong walled ...
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41 views

Cumulative effect of two axial fans

If I already have a small DC axial 2m3/h fan blowing air at something, what will happen if I add a larger more powerful 6m3/h DC axial fan blowing from behind that one (i.e. its the larger fan first, ...
1 vote
23 views

How do cavity resonators differ from tubes of uniform width?

I read that wine bottle produces sound when u blow sideways onto its rim because some frequencies of the white noise produced in your mouth gets amplified when they match the natural frequency of the ...
1 vote
134 views

How can I build a regulated pressurised air supply?

I need a source of air pressure for an air bearing (3D printed cylinder that expands air upwards like an air hockey table). I would like to be able to control the flow of air. I don't have a lab air ...
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289 views

Using one electrical pump for multiple hoses

I'm currently trying to figure out a cheap way to build a cocktail machine. For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
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Are we capable of building bigger high pressure cylinders?

Check out this 200-300 bar cylinders: Is it practically possible to build a bigger cylinder of say: 10m x 1m - and make it hold a pressure of ...
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What is the idea behind an expansion valve?

I am watching this video(https://www.youtube.com/watch?v=gVLhrLTF878) and beginning at around the 2:20 mark, it explains the significance of an expansion valve with the following ideas: Restricts ...
36 views

Do companies recover CO2 and water from the purification step of cryogenic air separation, and how?

In the 3rd step of cryogenic air separation, filtered air is purified to remove water, CO2, and hydrocarbons from the N2-O2-Ar stream. Im interested in knowing what happens with that CO2 and water. ...
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1 vote