Combustion Definition and 363 Threads

How do I tell if a certain species will not react or combust with O2 gas regardless of the conditions? I am trying to deduce which species will have standard enthalpy (or entropy or Gibbs' free energy) of combustion of 0, besides obviously O2 itself. e.g. CO2, H2O, perhaps ...?

Hello. I've gone round and round in my studies of engines and related technologies and I've come to the point where I would benefit from a better understanding of how combustion reactions occur and are sustained in gasoline engines. I have been looking for some basic introductory level...

A company called ClearSign says it can use electric fields to shape combustion flames to improve powerplant efficiency by upto 30%: http://www.technologyreview.com/news/520466/flame-shaping-electric-fields-could-make-power-plants-cleaner/...

i am calculating the properties of an internal combustion engine, however, for efficiency i am getting a value of 0.2%.This seems too low to be correct. please see attached table of values and point out any figures that seem incorrect thanks

Hi. I am needing help on this... For a Year 12 physics assignment (australia), I am testing a Spud gun/lemon cannon. I need to work out the pressure inside the chamber just before the projectile begins to move, without using a pressure gauge. Tomorrow i'll be measuring the muzzle velocity using...

Homework Statement I have an assignment to calculate the temperature, T1, after combustion in a cylinder. The combustion itself happens at constant pressure. I also know the average molar mass, M, of the gases after combustion and that the specific heat capacity is constant and can be...

Has anyone ever built an internal combustion engine which runs on solid fuel? A system would have to use waste heat or a mechanical friction device or whatever to heat the fuel and produce vapor which would be burnt in the cylinder (similar to the way coal gas was produced). Of course the vapor...

Lithium Hydride contains more hydrogen per unit volume than liquid hydrogen does, so what is stopping us from developing a Lithium Hydride storage solution to supply hydrogen to a vehicle's engine? The reactivity of the substance would throw up some substantial challenges, but compared to...

2 Questions -- Heating room air, and fuel combustion efficiency Homework Statement 2 questions. In advance, i needed to translate it so i am sorry if it is states incorrect. I really did my best to do it right. 1. The density of air at 1 atm and 10.0 ° C is equal to 1.24 kg / m3. (cubic...

In the reaction of H2(g) + O2(g) --> H2O(g) (for example), the H2 doesn't have sufficient energy to overcome the AE to break apart into H+ ions and form H2O molelcules, so a spark is required. In the case of oxygen breaking apart into O2- ions, I'm guessing it does so just to react with the H+...

Homework Statement The problem is to calculate the mean molar mass of the reaktion below, which takes place in a combustion engine. C4H10 + z(0.79N2 + 0.21O2) → αH2O + βCO2 + γN2 where the molar masses for the different molecules/atoms are: MH2O = 18, MCO2 = 44, MN2 = 28, MO2 = 32, MC =...

This is driving me insane:----- What is the difference between a combustible substance and a supporter of combustion? Thanx in advance...

Burning a 3.230 g sample of the unknown compound in an excess of oxygen produces 4.7341 g of CO2 (carbon dioxide). The carbon initially in the unknown compound is completely converted to carbon in the CO2. If it is determined that the molecular weight of the unknown compound is 180.16 g/mol...

Using kerosene as a fuel in a gas turbine engine. What can be the largest SMD that the atomizers HAVE to provide for engine start-up and to sustain combustion? SMD : Sauter Mean Diameter or also known as D32 in drop size distributions model.

I hope I can make this understandable. I'm working on a design to utilize combustion of propane to cycle a piston. I'll attach a gif to make it more simple to understand. When the cylinder is filled with an ideal 4% of propane (green) it'll combust (turns yellow) to push back the cylinder...

Homework Statement Complete combustion of a 0.0150 mol sample of a hydrocarbon, CxHy, gives 1.680L of CO2 at STP and 0.810g of H2O a) what is the molecular formula b) what is empirical formula Homework Equations pv=nRt The Attempt at a Solution a) mol of co2: n=pv/Rt=1 atm *...

Homework Statement

Homework Statement A sample of K (s) of mass 2.740g undergoes combustion in a constant volume calorimeter at 298.15K . The calorimeter constant is 1849 J/K , and the measured temperature rise in the inner water bath containing 1450 of water is 1.60K Calculate the enthalpy of formation for...

I am attempting to improve a spreadsheet I created back in uni some 5-6 years ago, which models all the velocities and accelerations of the pistons and rods, as well calculating pressure, temperature and resulting torque. It is only a simple model so far, originally it started simply by...

Homework Statement n A student performs a combustion experiment by burn- ing a mixture of fuel and oxygen in a constant-volume metal can surrounded by a water bath. During the experiment, the temperature of the water is observed to rise. Regard the mixture of fuel and oxygen as the system...

Hi Not a homework question, just a fool tinkering... I have been messing around with the concepts of a stirling engine, and have been looking at other engines which do not use an explosive mixture (petrol etc) as their heat source. I have to say I am having trouble getting my head...

Hi Guys, I have a Year 11 Project weighted 15% of my year mark due in 5 weeks. For my project I've decided to build a classic combustion potato gun. This gun will consist of pvc piping, barrel, Lantern lighter, any other components and of course hairspray (combustion) Anyways It is still only...

I'm just trying to figure out a theory. Forget what you know about a reciprocating piston engine, and just dream with me for a second. Say a piston could just turn around and come back down the cylinder at ANYTIME in the stroke, would the fuel always burn most efficiently? It's hard to...

Hey Guys, do you know where I can find the heat of combustion for D2 gas? Kind Regards, -TP

Homework Statement When 1.00g of ethanol was burned under a container of water, it was found that 100g of water was heated from, 15°C to 65°C, The process was known to be only 70% efficient. Calculate the enthalpy change of combustion of ethanol taking specific heat capacity of water to be...

I'm trying to build a micro combuster, but i can't afford platinum. Anybody know of a catalyst that can allow for the combustion of gaseous hydrocarbons(methane, propane, etc.), in air, at atmospheric pressure, and at no more than 200 F?

the problem I am working with is: Naphthalene is a carbon-hydrogen compound that finds use as mothballs. A sample of naphthalene is subjected to combustion analysis, producing 1.100g of CO2 and .1802g of H2O. Based on these data, calculate the empirical formula of naphthalene. So when i set...

Hopefully one of you guys can help me out.. I'm designing a burner that will run off powdered biofuel and I'm trying to calculate the resulting temperature after combustion. I have a higher heating value (HHV) of around 10,000 BTU/lb for the biofuel and for a complete stoichiometric...

Homework Statement What is the heat released by the complete combustion of 22.4x10^3 litres of FeTiH2 - a fuel used in hydrogen cars -, producing liquid water? Homework Equations ΔH°(reaction) = ΔH°f(products) - ΔH°f(reactants) The Attempt at a Solution 1 mol FeTiH2 - 22,4 L (STP)...

Hey everyone, I've got a question that been in the back of my mind for a few months now. Hopefully someone on this forum can provide me with some guidance. I just finished my undergraduate career in aeronautical engineering; I'll be starting graduate school this coming August. On a gut feeling...

Hi every body ! I am really gladed to be here to ask my very first question. I am working on a scolar project. My objective is creating a combustion model for a 2 stroke engine. The model that i have proposed is a 0D one, I have succed to describe the majority of mecanisms that i have...

Hello, I have 2 problems that are currently bothering me, and I would enjoy help with either. The more immediate of these problems is with my family's gas stove. Whenever we need water to boil, we put the pot on and turn the burner all the way up. My father then comes in and turns it...

Homework Statement A solid fuel supplied to a furnace had the following composition by mass. Carbon: 86% Hydrogen: 5% Oxygen:4% Incombustibles: 5% Dry volumetric analysis of the combustion products showed the flue gas contained 15% and 1.5% of CO2 and CO respectively. The test on the...

What is combustion - is it any reaction that produces energy? Or is it an exothermic reaction involving oxygen?

hey guys i am having a really hard time doing enthalpy problems, i am trying to do this(its not an homework question) Calculate the enthalpy of formation of ethane (C2H6) given that the enthalpy of combustion of ethane is -2840kj. DeltaHfH2O(1) = -286 kg/mol Delta HfCO2 (g) =-394...

Hello I am a first year Mechatronics major (yes its a real major), and currently looking into the effects that magnetic and electric fields have on combustion. I have a few questions. 1) Concerning the electric field effects are the ions carried on the wall that carries the corresponding...

Problem: I need to find the new pressure inside a combustion chamber, from the burning of the fuel, and the increase in temperature, if the piston/plunger seized/ some of this is nominal, just to get a general idea of where I'm at. Honestly it's best explained as a pipe bomb... what if i...

. About a car internal combustion engine. Lets suppose the engine torque is maximum at 3500 RPMs when the engine gets also its maximum load, let's say, a 90%. This kind of data is usually shown at WOT. My question is: if the throttle is not wide open, but half open, allowing the cylinders...

Homework Statement A fuel oil burned in a steam generator has a composition that may be represented as C15H32. A dry basis analysis of the flue gas yields the following molar composition: CO2 10.111%, CO 1.000%, O2 5.611%, and N2 83.278%. Determine the following: (a). The...

Recently I read about Saab's experiments at closed loop spark advance, and it got me wondering. If you are controlling spark advance to maintain a constant peak pressure position of 20 deg after TDC is it possible to get into a situation where detonation or pre-ignition is possible. It seems to...

Hi, I have some silly questions about combustion and the Wikipedia page (http://en.wikipedia.org/wiki/Combustion) doesn't explain all I would like to know. Can you please help to answer these questions? Q1. What exactly makes combustion an exothermic reaction? Is it because there is a...

Hey guys, Had this over in the mechanical engineering section but I think I might have more luck with getting an answer over here. The question is, what is happening to make the extra power when using a rich mixture in an SI engine? An air fuel ratio (AF:R) of 14.7:1 is stoichiometric for...

Hey guys, Combustion in an SI engine. So an AF:R of 14.7:1 is stoichiometric for petrol (gas), but an AF:R of 12.5:1 makes more power. One common thought is that not all the fuel and oxygen react in a stoichiometric mix, so by upping the fuel there is more chance of all the oxygen...

We all know the constant volume combustion engine acts as a kind of internal combustion engine that is used in the car and truck extremely widely. The cycle is called Otto cycle. I also heard the constant volume combustion gas turbine engine was proposed many years ago and developed a few ones...

This may belong in the Chemistry section but this is a problem from my Thermodynamics class, so I'll post it here and then move to the Chem section if need be. Homework Statement Methane (CH4) is the principal constituent of natural gas and is often used to represent natural gas. Consider...

Homework Statement I want to find a relationship between the number of moles of O2 used and the number of CH2 units in an alkane in a complete combustion reaction. Homework Equations The Attempt at a Solution Right now I have come up with a math equation, given X units of CH2...

Homework Statement Consider the combustion of octane that is burned in a bomb calorimter in the presence of 10.00kg of water. When burning 8.10mL of octane (.703g/ml=d) the temp. of the surrounding water increase by 5.66°C. The heat capacity of the bomb calorimter is 6.656Kj/ °C and the...

Homework Statement Using Hess's Law and any necessary information from your Data Booklet, calculate the molar enthalpy of reaction for the combustion of ethene in kJ/mol. im so lost! i was going to find each sections molar en thalpy and then balance it but what's oxygens and do i multiply...

Here's my problem: I want to design a cylindrical combustion chamber for a hybrid propelent rocket. Basically, I will burn paraffin and use oxygen as oxidant. As I will be using stainless steel, I thought I could approximate the maximum stress that must be resisted by the material through a...

The link is to an article that describes the history of plastic combustion engines! The reason they are not in your automobile is that those who are experts don't like the idea. There are incentives in the U.S. to make cars more fuel efficient by some 5 years from now but the plastic combustal...