what kind of fuel mixture causes detonation
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What are the causes of detonation in an engine? Detonation (not to be confused with pre-ignition) is a spontaneous combustion of the end-gas (remaning air-fuel mixture) within the combustion chamber AFTER the spark/ignition. Combustion of the air-fuel mixture is supposed to be a smooth, controlled burn originating at the spark plug and spreading throughout the chamber, (relatively) steadily increasing pressure and tempurature to drive the piston down.
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- As nitroglycerin contains oxygen, nitrogen and carbon, an explosion is essentially rapid combustion - the three nitrate groups (powerful oxidizing agents) are bound directly to a hydrocarbon fragment (a fuel).
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- PRE-IGNITION AND DETONATION. BEFORE we consider the use of other additives to the fuel we must get a clear understanding of the problem introduced by two well known conditions that occur, especially when you are seeking high performance from the engine, and in particular using fuel of the type we have been discussing.
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How Diesel Engines Work Both diesel engines and gasoline engines covert fuel into energy through a series of small explosions or combustions. The major difference between diesel and gasoline is the way these explosions happen. In a gasoline engine, fuel is mixed with air, compressed by pistons and ignited by sparks from spark plugs. In a diesel engine, however, the air is compressed first, and then the fuel is injected. Because air heats up when it's compressed, the fuel ignites. The following animation shows the diesel cycle in action. You can compare it to the animation of the gasoline engine to see the differences.
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- Eectch98-Part2.fm EEC-IV Technical Notes: Software 29 last edited: 9/29/98 The Startup Fuel A:F Ratio Table sets the startup fuel mixture enrichment based onthe engine temperature -- analogous to the choke function of a carburetor. The mix-ture is additionally modified by the time the engine has been operating.
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- Reference Information 443 ReferenceInformation www.mathesontrigas.com Lower and Upper Explosive Limits forFlammable Gases and Vapors (LEL/UEL) Before a fire or explosion can occur, three conditions must be metsimultaneously. A fuel (ie.combustible gas) and oxygen (air) mustexist in certain proportions, along with an ignition source, such asa spark or flame. The ratio of fuel and oxygen that is requiredvaries with each combustible gas or vapor.he maximum concentration of a gasor vapor that will burn in air is defined as the Upper ExplosiveLimit (UEL). Above this level, the mixture is too “rich” to burn.The range between the LEL and UEL is known as the flammablerange for that gas or vapor.
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Chemical explosive Explosives usually have less potential energy than fuels, but their high rate of energy release produces a great blast pressure. TNT has a detonation velocity of 6,940 m/s compared to 1,680 m/s for the detonation of a pentane-air mixture, and the 0.34-m/s stoichiometric flame speed of gasoline combustion in air.
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What are the Different Types of Combustion Systems? Combustion of a liquid fuel in an oxidizing atmosphere actually happens in the gas phase. It is the vapor that burns, not the liquid. Therefore, a liquid will normally catch fire only above a certain temperature: its flash point.ncomplete combustion will occur when there is not enough oxygen to allow the fuel to react completely to produce carbon dioxide and water. It also happens when the combustion is quenched by a heat sink, such as a solid surface or flame trap.
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Vapour Combustion The vapor mixture flows into the vapor collection system at the loading facility and through the vapor header that connects the loading facility with the VCU. The vapor mixture then flows through an in-line detonation arrestor that is equipped with a temperature switch on one face of the detonation arrestor element. As the vapor mixture flow continues, the pressure will increase in the vapor piping. This increase in pressure is sensed by pressure controls located at the VCU. When the pressure reaches a predetermined level, the vapor-staging valve will open automatically allowing the vapor mixture to flow to the burner elements where the combustible vapors are ignited by the pilot and burned.
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3 Causes of Engine Knock 3 Causes of Engine Knock. Engine knock is among the most disturbing problems a vehicle can have, but not many people know what it is, or how it is caused. Basically, engine knock (also known as pinging, detonation and spark knock) occurs when the air/fuel mixture inside a cylinder is incorrect, which makes the fuel burn unevenly.
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Aircraft Piston Engines: Detonation and Pre-Ignition Internal Combustion vs. Detonation in Aircraft Piston Engines. Normal activity in the internal combustion engine entails a progressive burning of the fuel-air mixture within the cylinders. The gasses within the cylinders are ignited from the top. The flame produced as a consequence travels down synchronously.
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- Unburnt air/fuel mixture passing through the exhaust and igniting also results in backfiring. This is usually caused by a temporary loss of ignition or rich idle mixtures in combination with exhaust air leaks. If there is only moderate backfiring it may be because the exhaust valves are leaking or the tappets are tight.
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Homemade Explosives...a Primer.... Explosive chemicals are made up of the oxidizer and the fuel, the oxidizer provides oxygen and the fuel burns that oxygen, they work together at a fast rate to cause an explosion. A fuel ignited alone would try to take oxygen from the air therefore burning very slowly, burning out if the air supply is not present.
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What Does Engine Pinging / Detonation Sound Like This is a car engine that has a ping. Also called spark knock, preignition or detonation. If left uncorrected it can ruin the motor. Caused by either a lean fuel condition, carbon deposits in the combustion chamber, over advanced ignition timing, wrong spark plugs, or overheating.
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Nitromethane Nitromethane can also be mixed with ammonium nitrate, which is used as an oxidizer, to form an explosive mixture known as ANNM. One graphic example of this was the use of nitromethane and ammonium nitrate in the Oklahoma City bombing.he oxygen content of nitromethane enables it to burn with much less atmospheric oxygen. The amount of air required to burn 1 kg (2.2 lb) of gasoline is 14.7 kg (32 lb), but only 1.7 kg (3.7 lb) of air is required for 1 kg of nitromethane.
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Carburetor Tuning: A/F Mixture, Air/Fuel Equation Theoretically, the ideal stoichiometric A/F mixture (the chemically ideal mixture of air and fuel that is required to provide a complete burn) for a properly tuned engine running on pure gasoline is 14.7:1; that is, 14.7 lbs. of air to 1 lb. of fuel.heoretically, the ideal stoichiometric A/F mixture (the chemically ideal mixture of air and fuel that is required to provide a complete burn) for a properly tuned engine running on pure gasoline is 14.7:1; that is, 14.7 lbs. of air to 1 lb. of fuel.
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Three Ethanol Myths Clarified The phase-separated water/ethanol mixture would settle on the bottom of the tank near the fuel pick-up and would quickly stall out or even damage your engine. And because ethanol is used to boost octane, the remaining (low-octane) gasoline at the top of the tank would also have the potential to damage your engine. Note, however, that a fuel filter (10-micron) is essential to keep gunk from reaching your engine.
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Back to Basics: Preventing Piston Problems Over time, detonation can be very damaging to the pistons as well as the rings, head gasket and rod bearings. Detonation damage typically includes cracked or broken ring lands and cracks in the piston itself. Replacing the damaged pistons will temporarily solve the engine’s mechanical problems.
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- Intake Timing. The fuel/air ratio that is ignited depends greatly on the intake valve. If the intake valve is not opening and closing at the proper times, such as if the spark plugs fire before the intake valve closes, the spark will light the fuel that is in the intake manifold and cause the backfire.
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- exists and is an alternate of . Combustion , or the ignition of the fuel-air mixture , occurs within the engine's piston cylinders ~ see related link below to a video tutorial .
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How Gasoline Works The amount of compression is called the compression ratio of the engine. A typical engine might have a compression ratio of 8-to-1. (See How Car Engines Work for details.). The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like regular 87-octane gasoline) can handle the least amount of compression before igniting.
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- The ethanol in the gasoline attracts water from the atmosphere and the two bond together — a process called “phase separation.” Having water in your fuel mix is not good. Water gets in, separates the oil and gas into 2 layers.
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- characteristic of a fuel to resist detonation. In automobiles, low octane fuel causes “knocking” (detonation) in the engine. Since automobile engines operate at relatively low rpm, the knocking is of much less consequence than in high speed chainsaw engines. For most operators, the chainsaw’s high
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- In a rocket engine, fuel and a source of oxygen, called an oxidizer, are mixed and exploded in a combustion chamber. The combustion produces hot exhaust which is passed through a nozzle to accelerate the flow and produce thrust.
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- Although nitroglycerin can deflagrate or burn, the explosive decomposes almost instantaneously producing a supersonic shockwave that propagates through the fuel-rich medium/material. Instantaneous destruction of all the molecules in the sample is known as detonation, where rapid expansion of hot gases causes a violent and destructive explosion. One advantage that nitroglycerin possesses in contrast to other high explosives, such as TNT, is that no solid forms of carbon (soot or smoke) are produced once the material is detonated.
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Flammable & Combustible Liquids - Hazards This means that gasoline can be ignited when it is in the air at levels between 1.4 and 7.6 percent. A concentration of gasoline vapour in air below 1.4 percent is too lean to burn. Gasoline vapour levels above 7.6 percent are too rich to burn.