Combustion Definition and 348 Threads

I am most interested in understanding and improving the internal combustion engines of all types from jet engines to 2 stroke lawn mower engines. I have several concepts I have developed thru my own analysis and would like to hear from the professionals.

I'm surprised that I'm getting this wrong. Seems like everything checks out in my calculation. Correct answer is supposedly C.

Hi! I was wondering if it is possible to calculate the temperature near the roof of combustion chamber based on thermocouple reading which is located at nine o'clock position. Tip of measuring device is located 49 mm from the surface of hot face material. Please find the picture attached...

Dear All. Good evening I work with diesel generatora on board of ships. Our major value that is considered after oh and during the maintenance checks is Pmax - maximum cobustion pressure in combustion chamber. It had to be equeal (~ +- 5 bar between each cylinder). I am familiar with all...

Balancing the complete combustion of acetic acid equation to carbon dioxide and water is straightforward if you remember hydrogen is always +1, elemental oxygen is zero and combined oxygen is always -2. just balance the exchange of electrons between oxygen and carbon. But how do you balance...

Hi, 1st and general case: 2 H2 and 1 O2 take up 1 liter of volume at, for example, 20°C, before combustion. After combustion and cooling down to 20°C, how much volume do the exhaust gases take up? Since the stoichiometric relationsship is 2 mols of H2 for every mole of O2, so those three moles...

Very much interested in everything about engines. While the battery EV seems to be the generally accepted propulsion of the future, I think the Hydrogen (Flex) fueled internal combustion could prove to out-perform it in every way. An engine that is designed for Hydrogen, but could also run...

Is it possible that in combustion, the chemical energy of reaction is released wholly through photon emission. Say as in simple burning of wood.

https://www.msn.com/en-us/autos/news/toyota-s-upcoming-hydrogen-powered-5-0-v-8-engine-has-the-potential-to-bury-evs/ar-AA15Q9mq See also an old thread - https://www.physicsforums.com/threads/hydrogen-combustion-engines.70653/ But what material. I know that Nippon Steel & Sumitomo Metals...

Hydrogen as well as Deuterium are both flammable chemically, I read that both hydrogen as well as deuterium can ignite/combust upon compression even in ordinary ICE engines. Hydrogen has been investigated and used as fuel for internal combustion engines. Now in a inertial fusion approach the...

I'd like to do some experiments with flames at different Equivalence Ratios - but I'm confused as to how I can find the Equivalence Ratio for different conditions. Wiki-article So the stoichiometric balance for Methane + Air is CH4 + 2(O2 + 3.76N2) -> CO2 + 2H2O + 7.52N2 Referencing equations...

I was wondering you if you could use a laser to put out a fuse or to stop combustion? Could you use some form of laser/laser cooling to put out an explosion mid-explosion?

Why don't cars use something like a rail gun instead of combustion to drive pistons?

Hi, This post is about a 4-piston, 4 stroke internal combustion engine(ICE).Here is an youtube animation for such an engine. I actually have 2 questions. Q1: We have seen in demos and videos that in a 4-piston (ICE) engine, the pistons P1 ,P4 (pair 1) and P2, P3 (pair 2) are in phase when...

In an Internal Combustion Engine, does liquid gasoline itself burn/combust, or is it the gasoline VAPOR emitted from the liquid gasoline by evaporation that burns/ combusts? (assuming that Oxygen is present in the Air and Fuel mixture)

Hi, I have to calculate the maximum flame temperature of the reaction above. The answer is 4805K but I didn't manage to obtain that answer. Please help me find my error, thank you so much! The values of C are below the solution attempt.

I have a single cylinder 5kW diesel generator to use for fuel efficiency and emissions reductions improvement experiments. I built an emulsifier out of an old drill press and paint cans. It's basically just a spinning cylinder inside another cylinder to get a lot of shearing force. The...

Good morning to all of you. For my diploma thesis I have to compare the combined production of electricity and heat from a biomass gasification unit and from a biomass combustion unit. So I would like to ask you if you know data or refer me to papers so that I can compare these 2 technologies...

Hello all, I'm thinking of converting my car to Electricity. I know that some internal systems have to change. Can that work? and how?

I am interested in build a hydrogen stove for cooking and wish to use a catalytic stove. I cannot find much information about this anywhere, but only that nickel can be used for hydrogen rather than platinum. 1) Can I just use stainless scotch brite scrub pad as catalyst assuming it...

The balanced reaction wil be : ##2C_6H_{6(l)}+15O_{2(g)}->12CO_{2(g)}+6H_2O_(l)## in order to compute the the standard enthalpy of reaction : ##\Delta H°_{f} H_2O_(l)= -285,8 \frac {KJ}{mol}##; ##\Delta H°_{f} CO_{2(g)}= -393,5 \frac {KJ}{mol}##; ##\Delta H°_{f} C_6H_{6(l)}=49,04 \frac...

First, I calculated the number of moles of glucose. n = m / M n = 1.8 / 180 n = 0.01 moles of glucose So I checked the combustion reaction. 1 C6H12O6 + 6 O2 -> 6 CO2 + 6 H20 1 + 6 -> 6 + 6 0.01 + 0.06 -> 0.06 + 0.06 I considered the number of moles at the end of the reaction. I subtracted...

I have studied in high school that all chemical reactions obey conservation of mass, as the atoms are merely re-arranged, but when I read through special relativity, I was reading that you can show an infinitesimal change in mass (based on E=mc2) in combustion that's not noticeable that's being...

Hi, If I had a volume of Brown's gas at 20°C / 1atm, what would the expected volume [of the resultant steam] be immediately after it was ignited? Thanks! Bob

number of moles of CO2 =0.089moles (using 2/22.4) number of moles of water = 0.067 (using 1.205/18) I know that all the carbon from the hydrocarbon is in the CO2 and all the hydrogen from the hydrocarbon is in the water and water creates x2 hydrogens so number of moles of C : H = 0.089 ...

Hi. How do i calculate the dynamic combustion pressure, force and piston velocity for different fuels in a cylinder? Assuming perfect combustion and no thermal loss trough the walls and piston. I am thinking about an application similar to for example a fuel driven nail gun that runs on a...

Hi All, I am helping a student (9th grader) develop a research topic related to his interests in physics for an independent study program he is applying for at our school. My background is Geology, so I am not too knowledgeable regarding topics in physics. This student is interested in...

Hi Folks, I have been trying to find data on the enthalpy of combustion of acetylene and fluorine. I have found the data for oxygen but am curious about the use of pure fluorine in stochiometric conditions and the resulting upper heating value when the oxidant is acetylene. I am happy to...

First time poster and also chemistry layman. I am starting on a new job building a carbon monoxide boiler in an oil refinery. As the construction contractor, we don't get into the operation/process of the equipment we build. I have found online that CO becomes combustible at around 1400F...

Q=heat capacity calorimeter*(-)change in T*moles =0.009089mol*-6.8C*4.38kj/C =-0.2707kj/mol This answer is wrong but it was the only one I could come up with right now. I just noticed units in the answer would be wrong too. Any suggestions?

So I'm still playing with my waste oil heating system, and as I figured the oil spraying out of the burner doesn't burn 100% clean without a combustion chamber. I set it up outside with the burner pointing into a 12" section of 6" steel stove pipe with an elbow on the end, and it works perfect...

Hello :oldsmile: I need to design a little burner, fed with vegetable oils like olive, soybean, sunflower and corn (alone or as a mixture). The fundamental requisite of the burner is that it must not generate any soot (smoke): since "zero" is something hardly attainable in technology, "very...

Hello all, This is my first post on here so sorry if its not the greatest. I am starting to make a car based video game for the ios in which you are able to customise cars and race them. One feature i wanted to include in this game was the ability to create unique engines. I don't want it...

I am trying to find out the heat of combustion of one kilogram of carbon dioxide with magnesium. I am looking for results for stochiometric conditions of these two reactants. I have found the following equation online 2 Mg(s) + CO2 ---> 2 MgO(s) + C(s) yields a standard enthalpy of --810.1...

Problem Statement: An explosive liquid at temperature 300 K contains a spherical bubble of radius 5 mm, full of its vapour. When a mechanical shock to the liquid causes adiabatic compression of the bubble, what radius of the bubble is required for combustion of the vapour, given that the vapour...

Conceptually this question makes sense to me I know a overcharged lithium battery will became unstable however with identical batteries except a different level of charge what would the properties of their combustion be? In depth conceptual, and mechanical explanations are always appreciated as...

Could anybody suggest some forums(or bbs(s)) of internal combustion engine? Hello guys, I'm a physics fan, recently I was doing some research of internal combustion engines, could anybody who could suggest some forums or bbs(s) of internal combustion engine? i need somewhere to find some...

Some jet and rocket engines use their own fuel as coolant. Hydrocarbons have even been used to cool electronics and nuclear reactors. Would it be viable for a combustion engine to use its own fuel as coolant instead of water or another liquid?

hello my friends , i have two question about calorific value of coal why Lower heating value decrease with increase oxygen content but increase with increasing hydrogen , sulfur and carbon content ? Do this elements influence the higher heating value or not ?

Homework Statement Why is enthalpy of combustion 0KJmol-1 for oxygen? I need to know this for my exam coming up soon. Homework Equations The enthalpy change when 1 mole of a substance is burnt in excess oxygen under standard states under standard conditions. The Attempt at a Solution Oxygen...

Homework Statement Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005-g sample of menthol is combusted, producing 0.2829 g of CO2 and 0.1159 g of H2O. What is the empirical formula for menthol? If menthol has a molar mass of 156 g/mol, what is...

Homework Statement There is an insulated internal combustion engine fueled by one mole of octane. It operates at a constant pressure of 5.0 bar. The initial temperature is 200°C. Calculate the heat exchanged with the surroundings, the Δh for the gas, the final temperature, the work performed...

if we had an entire car made of Starlite (a material that was created resistant to 18032 °F). Would the efficiency of the combustion engine be close to that of the electric and that of the electric would be almost 100% efficient? https://en.wikipedia.org/wiki/Starlite

Greetings! I've been brushing up on some thermodynamics recently and came across a perplexing sentence in my notes and text from undergrad. It says that for a combustion reaction, such as the combustion of heptane: C7H16 (l) + 11O2 (g) ---> 7CO2 (g) + 8H2O (l) That this process carried out at...

Hi there, TL/DR - I have a community college job with a sufficient salary. Should I be happy with that + freetime or should I try to get a job which really uses my PhD? If I go with happy freetime option, are any of the projects I propose interesting AND feasible? If I am too lazy to follow...

How efficiently is the fuel burned in a typical liquid fuel rocket engine? I've heard numbers ranging from 95% to below 50%.

Homework Statement A furnace wall consists of three layers of material as shown below. The thermal conductivities are: Firebrick = 1.15 W m–1 K–1 Insulating brick = 0.17 W m–1 K–1 Ordinary brick = 0.62 W m–1 K–1 Calculate: (i) the thermal resistance of each layer (ii) the heat loss per...

Homework Statement A small reheating furnace wall consists of 200 mm of firebrick. The inner surface of the wall is at a temperature of 320 °C and the outside temperature is 35 °C. Calculate the rate at which heat is transferred, by conduction, through unit area of the wall. The thermal...

I got two definitions for this enthalpy: I)Heat change when 1 mole of a substance is completely burned or oxidised(My textbook) 2) Heat change when 1 mole of compound is completely burnt or oxidized in oxygen(From a site) So if I had this reaction: H2(g)+1/2 O2(g)---->H20...

<< Mentor Note -- poster reminded to use the standard Template >> Question Three A pipe of outside diameter 200 mm is lagged with an insulating material of thermal conductivity 0.06 W m-1 K-1 and thickness 75 mm. The pipe carries a process fluid at a temperature of 300 °C and the average...