toward introduction of an amazing new kind of internal combustion engine, researchers in China are reporting development and use of a new and more accurate computer model to assess performance of the so-called free-piston linear alternator (FPLA).
Their study of the FPLA, which could provide a low-emission, fuel efficient engine for future hybrid electric vehicles, is scheduled for the Sept. 17 issue of ACS' Energy & Fuels, a bi-monthly journal.
Qingfeng Li and colleagues point out that the FPLA has only one moving part and is an engine designed to generate electricity. In the device, a piston in a cylinder shuttles between two combustion chambers. Permanent magnets on the piston generate electricity by passing through the coils of an alternator centered on the cylinder. The engine can burn a variety of fuels, including natural gas and hydrogen, and seems ideal use in a future world of climate change and possible fossil fuel shortages, they suggest.
Their report describes development of a better computer model to evaluate performance of the FPLA and guide engineers in construction of the engine. Results of their initial simulations showed that the FPLA could accelerate three times faster than other internal combustion engines and burns fuel in ways that minimize air pollution. "It is an environmentally friendly power source for the future," the report concludes.
Saturday, July 25, 2009
Friday, July 24, 2009
Engine
the internal combustion engine is an engine in which the combustion of a fuel occurs with an oxidiser (usually air) in a combustion chamber. In an internal combustion engine the expansion of the high temperature and pressure gases, that are produced by the combustion, directly apply force to a movable component of the engine, such as the pistons or turbine blades and by moving it over a distance, generate useful mechanical energy
The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with variants, such as the Wankel rotary engine. A second class of internal combustion engines use continuous combustion: gas turbines, jet engines and most rocket engines, each of which are internal combustion engines on the same principle as previously described.
The internal combustion engine (or ICE) is quite different from external combustion engines, such as steam or Stirling engines, in which the energy is delivered to a working fluid not consisting of, mixed with or contaminated by combustion products. Working fluids can be air, hot water, pressurised water or even liquid sodium, heated in some kind of boiler by fossil fuel, wood-burning, nuclear, solar etc.
A large number of different designs for ICEs have been developed and built, with a variety of different strengths and weaknesses. While there have been and still are many stationary applications, the real strength of internal combustion engines is in mobile applications and they completely dominate as a power supply for cars, aircraft, and boats, from the smallest to the biggest. Only for hand-held power tools do they share part of the market with battery powered devices. Powered by an energy-dense fuel (nearly always liquid, derived from fossil fuels) the ICE delivers an excellent power-to-weight ratio with few safety or other disadvantages.
Internal combustion engines are most commonly used for mobile propulsion in vehicles and portable machinery. In mobile equipment, internal combustion is advantageous since it can provide high power-to-weight ratios together with excellent fuel energy density. Generally using fossil fuel (mainly petroleum), these engines have appeared in transport in almost all vehicles (automobiles, trucks, motorcycles, boats, and in a wide variety of aircraft and locomotives).
Internal combustion engines appear in the form of gas turbines as well where a very high power is required, such as in jet aircraft, helicopters, and large ships. They are also frequently used for electric generators and by industry.
The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with variants, such as the Wankel rotary engine. A second class of internal combustion engines use continuous combustion: gas turbines, jet engines and most rocket engines, each of which are internal combustion engines on the same principle as previously described.
The internal combustion engine (or ICE) is quite different from external combustion engines, such as steam or Stirling engines, in which the energy is delivered to a working fluid not consisting of, mixed with or contaminated by combustion products. Working fluids can be air, hot water, pressurised water or even liquid sodium, heated in some kind of boiler by fossil fuel, wood-burning, nuclear, solar etc.
A large number of different designs for ICEs have been developed and built, with a variety of different strengths and weaknesses. While there have been and still are many stationary applications, the real strength of internal combustion engines is in mobile applications and they completely dominate as a power supply for cars, aircraft, and boats, from the smallest to the biggest. Only for hand-held power tools do they share part of the market with battery powered devices. Powered by an energy-dense fuel (nearly always liquid, derived from fossil fuels) the ICE delivers an excellent power-to-weight ratio with few safety or other disadvantages.
Internal combustion engines are most commonly used for mobile propulsion in vehicles and portable machinery. In mobile equipment, internal combustion is advantageous since it can provide high power-to-weight ratios together with excellent fuel energy density. Generally using fossil fuel (mainly petroleum), these engines have appeared in transport in almost all vehicles (automobiles, trucks, motorcycles, boats, and in a wide variety of aircraft and locomotives).
Internal combustion engines appear in the form of gas turbines as well where a very high power is required, such as in jet aircraft, helicopters, and large ships. They are also frequently used for electric generators and by industry.
The History of the Automobile
the First Mass Producers of Cars - The Assembly Line
By the early 1900s, gasoline cars started to outsell all other types of motor vehicles. The market was growing for economical automobiles and the need for industrial production was pressing.
The first car manufacturers in the world were French: Panhard & Levassor (1889) and Peugeot (1891). By car manufacturer we mean builders of entire motor vehicles for sale and not just engine inventors who experimented with car design to test their engines - Daimler and Benz began as the latter before becoming full car manufacturers and made their early money by licensing their patents and selling their engines to car manufacturers.
Rene Panhard and Emile Levassor
Rene Panhard and Emile Levassor were partners in a woodworking machinery business, when they decided to become car manufacturers. They built their first car in 1890 using a Daimler engine. Edouard Sarazin, who held the license rights to the Daimler patent for France, commissioned the team. (Licensing a patent means that you pay a fee and then you have the right to build and use someone's invention for profit - in this case Sarazin had the right to build and sell Daimler engines in France.) The partners not only manufactured cars, they made improvements to the automotive body design.
Panhard-Levassor made vehicles with a pedal-operated clutch, a chain transmission leading to a change-speed gearbox, and a front radiator. Levassor was the first designer to move the engine to the front of the car and use a rear-wheel drive layout. This design was known as the Systeme Panhard and quickly became the standard for all cars because it gave a better balance and improved steering. Panhard and Levassor are also credited with the invention of the modern transmission - installed in their 1895 Panhard.
Panhard and Levassor also shared the licensing rights to Daimler motors with Armand Peugot. A Peugot car went on to win the first car race held in France, which gained Peugot publicity and boosted car sales. Ironically, the "Paris to Marseille" race of 1897 resulted in a fatal auto accident, killing Emile Levassor. (Learn more about Panhard and Levassor)
Early on, French manufacturers did not standardize car models - each car was different from the other. The first standardized car was the 1894, Benz Velo. One hundred and thirty four identical Velos were manufactured in 1895.
Panhard-Levassor made vehicles with a pedal-operated clutch, a chain transmission leading to a change-speed gearbox, and a front radiator. Levassor was the first designer to move the engine to the front of the car and use a rear-wheel drive layout. This design was known as the Systeme Panhard and quickly became the standard for all cars because it gave a better balance and improved steering. Panhard and Levassor are also credited with the invention of the modern transmission - installed in their 1895 Panhard.
Panhard and Levassor also shared the licensing rights to Daimler motors with Armand Peugot. A Peugot car went on to win the first car race held in France, which gained Peugot publicity and boosted car sales. Ironically, the "Paris to Marseille" race of 1897 resulted in a fatal auto accident, killing Emile Levassor. (Learn more about Panhard and Levassor)
Early on, French manufacturers did not standardize car models - each car was different from the other. The first standardized car was the 1894, Benz Velo. One hundred and thirty four identical Velos were manufactured in 1895.