Combustion Definition and 348 Threads

How does physics play into combustion? Can it be used to explain why certain metals/materials burn or melt? I don't understand how combustion can be explained in terms of physics instead of chemistry. Also, what are some things that can be burned that result in a unique reaction due to physics...

What are the uses of mineral oils and self contained lubrication system in internal combustion engine? Please answer fast Its urgent

63.8 mg of a C - H - O compound produces 145.0 mg of CO2 and 59.38 mg of H2O. Find empirical formula. I THOUGHT that I simply had to find the moles of each compound as a ratio, but in doing that I get an answer that isn't an option. I calculate moles C as (12/44)(.145) = .0395 grams carbon...

I have read this in many places that carbon or any fuel for that matter example methane when undergoes combustion in limited supply of oxygen forms carbon monoxide as a major product. Could anyone explain me why this happens? I mean why can't the carbon atoms simply react with the required...

Hi, Can someone explain the lubrication mechanism for a piston in a typical automotive internal combustion engine? If the walls in the piston chamber are coated with oil, the lubricant should also burn along with the petroleum during the combustion phase (leaving problematic residues), so, is...

Can someone help me to describe specifically on combustion engine. Especially on Diesel and Turbine (Power Turbine).

The law says that the maximum thermal efficiency of a heat engine can be 88%. If I have and internal combustion engine using 9.8 cc/min instead of 25 to 30 cc/min and the other accepted figure is a 2L 4 cylinder engine for idle is it uses approx 5 HP of fuel just just to idle. So I am doing...

Could anyone recommend any literature on harmonic dampening inside of a combustion chamber (augmented injector plates and chamber geometry to reduce vibration)? It seems resources are rather scarce on the subject so if anyone knows of any websites, books, papers, etc. that might be helpful, I...

Hey folks! I am currently working through my masters in mechanical engineering with a focus on combustion. I have an introductory text by Stephen Turns that is pretty good and also a more advanced text by Chung Law, but I welcome any other suggestions people might have; the more introductory...

As a bit of a lay-person when it comes to physics... When considering combustion reactions (example: wood burning), I am a bit unsure about the source of the light of the flame. My current thoughts are the following: Maybe: 1. The photons are produced from the exchange of an...

Homework Statement An empty 4 L steel vessel is filled with 1 atm of CH4 and 4 atm of O2 at 300K. A spark causes the following reaction totake place. CH4 + O2 ------> CO2 + 2H20 delta H=-802 kj What is the final temperature inside the vessel after combustion assuming that the steel...

Homework Statement A fuel contains 48.0 mol% ethane (C2H6) and the remainder of the fuel is propene (C3H6). Determine the theorectical air in kmol for combustion of 5 kmol of the fuel. Give your answer to an accuracy of one decimal place. I got 10.2 kmol , is this correct? the reaction are...

Hey people I intend to self learn IC engines. I am a a little confused by what this sentence says in my textbook. "An idling engine is one which operates at no load and with nearly closed throttle" I basically want to know what loading means in this particular context? And what else can...

Hello Maybe this is a question more for chemists but then maybe not... We are talking about burnt emissions pollution in class. Comparing internal combustion engine emissions with household water heating systems (boilers) emissions. Please can anyone tell us if petrol/gasoline internal...

The question i am stuck on is "If 2.9g of ethanol burn with the evolution of 87 kj of heat, what is the molar heat of combustion of ethanol?" thank you for your help if it possible you can tell me how to do this question.

hey, I need all the help i can get on this one... can u guys tell me if there is any device that can be used instead of an ordinary fuel injector since i want it to be able to inject an air-fuel mixture. since the normal injector can't inject air i desperately need another device...

In selecting starter motor for a gas turbine, which minimum torque or inertia is it supposed to overcome, it that of the compressor or the turbine, or both.

Homework Statement A slice of banana weighing 2.502g was burnt in a bomb calorimeter producing a temperature rise of 3.05 C. The combustion of 0.316g of benzoic acid in the same calorimeter produced a tempterature rise of 3.24 C. The heat of combustion of benzoic acid at constant volume is...

Hi all, I have this question from my friends and hope get the answer. Using your car with the oil is not sufficient, the connecting rod is the first to fail. Normally it burns both bearings or the smaller one (connecting to piston) burns first? I think there's a dilemma here: the bigger one...

I have an spark ignited 4 cylinder 2000 cc engine in a wagon and I think its 50% thermally efficient at idle due to the mods I have done on the intake manifold. My engine uses (mesured on video) roughly 9.807 cc/min at approx 750 rpm and the only reference I have come across is a similar...

Homework Statement The organic solvent thiophene is a carbon-hydrogen-sulfur compound that makes C02, H20 AND S02 when burned in excess Oxygen. When subject to combustion analysis, a 1.3020g sample makes 2.7244 g CO2, .5575G H20 and .99151 SO2. Find the empirical formula of thiophene...

Hi I guess the title says it all. Why does heat start a combustion reaction? Why does a spark start a combustion reaction? thanks

what are the bset combustion properties (Pressure, Temperature) of air for jet engine?

Please can someone explain clearly in perhaps lay man terms the difference between REVERSIBLE & NON REVERSIBLE INTERNAL COMBUSTION ENGINES. Thanks

currently, I'm be studying on improving fire tube boiler's combustion efficiency. so, i need a software which is applicable to the title above in order to prove my calculation according to the formula. can u tell me what software can be used?

Hey folks :smile: I am not sure where to put this, but since GD gets so much traffic, I'll put it here for now. I am doing my MS in combustion. PF has always been there for me during my undergrad, but I am getting so deep into my subject that it is getting harder and harder for me to find...

I am not really sure how to start or what I am doing here. I am just trying to talk this out with myself and might need some guidance. My end goal is to derive a particular model used to measure laminar flame speeds. I am following along in An Introduction to Combustion by Stephen Turns and...

I am currently working my way through the paper by W.C. Reynolds "The Element Potential Method For Chemical Equilibrium Analysis: Implementation In The Interactive Program STANJAN." I am working on the basic maths at this point and have a few questions. Is there anyone here that is either...

The combustion of petrol can be approximately represented by the equation 2C[SIZE="1"]8H[SIZE="1"]18(g) + 25O[SIZE="1"]2 -----> 16CO[SIZE="1"]2 + 18H[SIZE="1"]2O The density of Ocatane is 0.7 gcm(cubed) What mass of oxygen is used up when 1L of petrol is burnt in a car engine...

Homework Statement I have worked out the Stoichiometric equation for this Combustion question, however the second part the Air Intake is only 90% which I have also worked out. My question is, during the element balancing how do I obtain values for b and c. Homework Equations So this is how...

Using Methane gas as an example (CH4 gas), explain why one can not assume the heat of combustion is the reverse of the heat of formation. I can't find a decent answer to this anywhere.

I'm currently doing a project on neural network controller for an internal combustion engine to reduce emissions level. Can anyone assist me in training such models (neural networks)

I have a question about how to calculate the mass/mole of a combustion gas. In my own research, I came across two methods. The first method is suspect in my opinion. The second I trust, although the discussion left some issues unexplained, so I attempted to fill in the details as best I...

Hey guys, I need to get some feedbacks from all of you here. Do you guys think it is possible for an engine to have a very low exhaust gas temperature and does not need any coolant radiator? The aim is simple, with lesser heat rejected through exhaust gas and radiator, there will be more...

Okay, so I've found this site (http://www.spiritofmaat.com/archive/feb2/carplans_doc.htm) and it claims to have a reliable method to convert a diesel engine to run off of hydrogen. Now, my question is is this actually feasible in the method they've described? I've asked two other sources and so...

Hi, I'm currently a student and learning these two topics for a module. I've searched the net for many references but can't find anything that is really that helpful. Can anyone reference me any good links to questions and solutions regarding these topics? Also any books you guys would...

[b]1. Homework Statement : Molecules in the combustion chamber of a rocket engine are in a high state of random motion. When the molecules leave through a nozzle in a more ordered state, will their temperature be more, less, or the same as their temperature in the chamber before being exhausted...

So I was reading about lightbulbs... and if I broke the bulb so that oxygen came onto the heated filament, I understand that the tungsten would combust. But how would I figure out how much energy would be given off? Would this cause a fire? I have no chemistry training so be gentle!

Hi, I'm not sure if I've got this in the right section, but I'm hoping someone can point me in the right direction. I'm trying to create a model of what's actually happening during the combustion cycle in an engine and where the energy is going. As the intake valve closes and the piston...

I am doing a thesis work and I am trying to figure out the amount of C02 and the products in combustion of Air and C8H18. Its known that the engine is operating on lean fuel, but I am having trouble with the reaction formula. This is not my subject. The engine is operating at lambda 1.2 to 1.6...

if i have calorific value of mixture, volume at time of compression, bore diameter, can i know the pressure being exerted on the pistons due to the combustion?

I’m from a group that is current working on the theory of a Hydrogen Economy. Our first area of development is the Hydrogen Highway. We are currently seeking help in the form of freelance / work for hire basically engineer(s) that could aid in design and calculations of internal combustion...

Hi there, my first post on this forum and I hope its in the right place ! My question is this, in an exisitng air-cooled motorcycle engine what is the viability of using heat pipe technology to cool exhaust gas temperature? Using heat pipes to remove heat from exhaust valve areas to external...

What is the fastest speed ever recorded, achieved by a internal combustion piston engine on a land vehicle, and not an aircraft/propeller? I know that some top-fuel dragsters can exceed 300 MPH.

can anyone please tell me what is the gas pressure which applies on piston head just after combustion in cylinder its very urgent and necessary for me to know this please help me

I have built a nice biomass gasifier that produces about 700,000 btu's of heat per hour by burning or flaring the gas that comes out of it. What I want to do is, to flare the gas in an enclosed chamber so I would be able to capture all the exhaust and run it through some heat exchangers for...

I've been trying to understand why fuel economy decreases when the engine gets into higher RPMs. That is, if you put the pedal to the metal and quickly accelerate to 40 MPH, your engine operates much less efficiently than if you slowly accelerated to 40 MPH. Here's where it seems the...

Homework Statement When a sample that is .91 grams is burned in oxygen, it produces 2.073 grams of carbon dioxide, .304 grams of water, and .0944 grams of nitrogen. What is the empirical formula of the compound? The Attempt at a Solution I converted all of the products to moles: CO2: .0471...

Expansion Work -- Still confused. This is more of a general question regarding thermodynamics. If you have a combustion reaction, and it produces either liquid water or water vapor--which case results in higher expansion work? My enthalpy calculations show higher PV work for the reaction with...

This inquiry is in relation to internal combustion engines. I am trying to figure out how to maximize the mass of air going into my engine. Because the more air that can get into the cylinder, the more power the motor can make. Now I've been researching Bernoulli's Principle and as I understand...