Questions tagged [combustion]

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Facing problem in simulating Combustion in ANSYS IC Engine Fluent

I am working on the project of Modelling of Combustion Process of Internal Combustion Diesel Engine Using Ansys ICE Fluent, in Which I am facing problem to obtain the Desired Result. My Objective: ...
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1answer
48 views

Calculating Mass Fractions of a Hydrogen and Oxygen Gas Mixture Pre Ignition

I am trying to calculate mass fractions of a Hydrogen Oxygen gas mixture as a function of equivalence ratio before ignition. My work is the following: Equivalence Ratio: $$\phi=\frac{FA}{FA_s}=\frac{\...
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1answer
32 views

Effect of Pressure on Combustion efficiency (of hydrogen) in excess air

Can somebody explain relation between combustion efficiency and pressure in lean mixtures using any kind of chart or mathematical equations? At first glance I thought, combustion efficiency increases ...
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1answer
41 views

Engine Combustion Cylinder Wall Thickness

Been referencing this website for some time but now need to seek specific help. I am not an engineering student but rather a DIY hack who loves engineering and machining neither of which I am ...
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41 views

Search for comprehensive term for plants with heat generation with heat storage and operating states

My master thesis deals with systems with several operating states that generate heat and store it in a heat storage. Thereby I analyze combined heat and power plants with combustion engines, but also ...
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1answer
48 views

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead?

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead (in a car)? (e.g. price, size, the power to weight ratio, etc.) Can you name any ...
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2answers
41 views

Where the Water Have Gone from Engine from a Combustion Process (C8H18+12.5O2==>8CO2+9H2O)?

During studying engine's exhaust as I asked here, I have to go far. The thing I though is quite simple, the fact is complicated. Thence I knew that there is water produced in combustion process. The ...
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33 views

What is the principle behind controlling thermoacoustic combustion instability with a speaker?

From "ThermoAcoustics and the Rijke Tube: Experiments, Identification, and Modeling", thermoacoustic instability can be subsided using an amplifier and a speaker. It says in page 4, The microphone ...
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1answer
39 views

Why to compress the hydrogen + air mixture in Hydrogen ICE engines when combustion efficiency of hydrogen at 1 atm is already high?

ICE Engines are designed to burn the fuel and air mixtures at high pressures to increase the combustion efficiency. But hydrogen combustion efficiency is already high at 1 atm and at constant Volume ...
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56 views

Measurement of ICE torque

I'm seeking a precise description of engine torque. We talk about torque in terms of the twisting force that the piston exerts on the crankshaft with a radius equivalent of the rod throw. Assume ...
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0answers
16 views

Heat of Combustion, Vaporization tables

It's my first time posting on this specific forum. I hope I'm doing this right. I am currently modeling fire spreading through different buildings via FDS, but I lack the properties of the materials ...
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3answers
905 views

Preheating Diesel before injection?

Significant amount of heat is lost from an engine by various means, so to recoup the energy, is it possible to increase efficiency via heating of diesel fuel prior to injection using waste engine heat ...
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2answers
126 views

Why afterburners are needed instead of burning more fuel inside the turbine?

I'm reading this article on afterburners: https://www.airspacemag.com/flight-today/how-things-work-afterburners-18481403/ It says in the article: A typical jet engine uses only about half the ...
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2answers
83 views

How to calculate the pressure loading of a vented silo explosion?

I would like to independently check a vendor's silo design for proper explosion venting. Worst case, it is essentially cylinder filled with a stoichiometric mixture atomized sugar dust and atmospheric ...
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3answers
53 views

Advice on simple spark ignition system

I'm looking for any tips on a simple and cheap means of generating a regular spark for ignition of propane in air, could be electrical or other but needs to be simple and fairly reliable. Criteria ...
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1answer
48 views

Can a water pressure switch be used as a low-water cutoff means for a steam boiler?

Steam boilers obviously need to be protected from the catastrophe of running out of water -- you then either get a meltdown if the boiler is fired unwatered for an extended period of time or a boiler ...
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1answer
29 views

Magnetohydrodynamics, ionizing combustion exhaust then converting its kinetic energy to electricity

I am trying to understand how to make generation of electrical power more efficient by using Faraday's law to directly convert the kinetic energy of the ionized or easily ionizable exhaust gases of ...
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1answer
52 views

What is the real CO2 emission for cars? 1g/km or >100g/km?

If one searches for the different levels of CO2 emissions in cars, one can find two very different levels. For instance: 1: Here it is written that: The law requires that the new cars registered ...
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5answers
359 views

Why is “regular” gasoline standard instead of something more knock-resistant?

The standard light petroleum distillate for vehicle engines, "regular gasoline," is (or is equivalent to) some mix of heptane (C7) and octane (C8). Higher proportions of C8 are more knock-resistant, ...
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1answer
93 views

IC engine where the piston is the spark plug

I recently had an idea about the design of an internal combustion engine. Normally, the spark must be timed using some kind of circuit, but if there was a "spike" on the piston: then would there be ...
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2answers
1k views

How do you prevent ignition of the gas-air mixture before it reaches the burner nozzle?

I believed that the flame propagates over the place where fuel contacts the oxygen. If it contacts a fule+O2 mixture, the mixture inflames as well, and so on and on and on until there is no more ...
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469 views

How can I estimate the rate of consumption of oxygen in a car engine?

I need some approximate figures for how many litres of oxygen per minute a typical car engine requires. How would I estimate this?
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158 views

How is the reaction progress variable $c$ coupled with Temperature equation while solving the SIMPLE algorithm in CFD?

While solving the Navier-Stokes equation using SIMPLE algorithm, we solve the transport equation for additional scalar at the last step according to the SIMPLE's procedure. We need to add a new ...
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2answers
69 views

Viscosity of select species at atmospheric pressure for very large temperatures?

I'm dealing with hot combustion products flowing through heat exchangers and I'd like to perform some calculations regarding the flow properties (velocity, temperature, pressure and density) as it ...
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3answers
929 views

How to increase the speed of exhaust gas?

I have a tube, at the bottom of the tube is burning wood and an air inlet. How can i increase the speed of the exhaust gas coming out of the tube? I thought about "bottle-necking" the exhaust pipe to ...
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1answer
657 views

Why does hydrogen fuel produce less horsepower than gasoline in internal combustion engines?

I was looking at hydrogen as alternative fuel and came across an article stating that although $\textrm{H}_2$ produces more energy than conventional fuel, it produces less horsepower in internal ...
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2answers
77 views

What surface temperature (rise) is required to (dis)qualify a combustion appliance from obtaining a “zero clearance to combustibles” rating?

How far must the surface temperature of a UL-listed combustion appliance rise to prohibit the manufacturer from specifying it for a zero clearance to combustibles installation? (I looked in UL 127 ...
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3answers
10k views

How to filter outside air during wildfire to safe breathable level?

I've had an experience of having outside air heavily polluted by wildfire smoke, and now I'm reading up on the wildfire happening in Southeast Asia. When the air outside got too polluted to breathe, I ...
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3answers
960 views

What metal material to use for stove exhaust pipe?

If biofuel is burnt, for example wood, and the stove I am building is made of metal, what is the most appropriate metal material I should use to avoid excessive corrosion in the exhaust pipe of the ...
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1answer
136 views

Is it possible to store leftover pressure from burning a propellant in a pressure vessel?

Say, in a firearm, after giving off a shot, if the barrel were to be closed off, does there exist a way to store some of it in an external pressure vessel, without requiring a mainly-external source ...
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1answer
199 views

Derivation for the Formulas of the Approximate Ultimate Analysis of Coal

I've been given the following to memorize; But my head is so crammed with many others that I need to find another way; Are these formulas Empirical? I was hoping that if I derive it from a much more ...
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0answers
1k views

What data do I need to plot a BSFC map

I have an 4 stroke spark ignition engine simulator which takes user inputs and outputs performance data. I need rpm, torque and brake specific fuel consumption (bsfc) to plot the bsfc map. I am able ...
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2answers
428 views

What relationship is there between mass of water vapour produced in combustion and the energy lost through producing this water?

I am performing a number of simple heat transfer experiments with the application of a magnetic field around the fuel line to evaluate the effects. To attempt to quantify some of the heat losses in ...
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1answer
1k views

How can I turn home gas (LPG) from liquid to gas?

"LPG" is the term used here for a mixture of Propane & Butane sold for public use. The exact ratio varies depending on where you buy it and I think also with the season and is not known to me. I ...
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1answer
2k views

Do magnetic fields applied to a fuel line have an effect on heat output?

I am doing my final year engineering project on Magnetic Field Assisted Combustion and was curious to see what people thought about it. Companies sell rare earth magnetic arrangements to be attached ...
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1answer
474 views

Which component of vehicle tailpipe emissions has the greatest social cost?

Emissions Emissions from vehicles have an associated social cost for everyone. We hear a lot about CO2, but CO2 is not the only thing that comes out of a tailpipe. From Wikipedia, emissions ...
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4answers
1k views

Does a diesel-like (ignition by compression) engine running on gaseous fuel exist?

I think, it could lead to, for example, very environment friendly and very efficient urban traffic. But I also think, it required very precise part construction. Do such things exist? At least in ...
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3answers
2k views

Why do some diesel engines run on diesel fuel and others on fuel oil?

Trucks and smaller vehicles with diesel engines run on diesel fuel which looks more or less like kerosene - less flammable than gasoline, low viscosity liquid. However larger diesel engines like this ...
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1answer
196 views

Is the concept IC Engine a viable concept?

The Concept IC engine is a reciprocating engine that opens the exhaust valves soon after combustion begins. The inventors claim that the exhaust acts similarly to a recoilless gun so that the piston ...
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4answers
2k views

How does a diesel internal combustion engine start even though there are no spark plugs?

I was just wondering how a diesel engine starts, given that there are no spark plugs. How does it build up 'momentum' for that first explosion in the cylinder? Does it have something to do with the ...
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3k views

What happens when you put the wrong type of fuel in an internal combustion engine?

What happens to the working of petrol engine when it is emptied and filled with diesel or to a diesel engine emptied and filled with petrol? Will the engine be able to operate and, if not, why not?
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260 views

What is the logic behind combustion air requirements?

Combustion Air is the air that is required to provide complete combustion for a fuel source. Enough oxygen is required so that there is not an issue with carbon monoxide. This is an issue in houses ...