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#1
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How does work diesel engine.?
hi people.
i would ask you something.Who can explain me how does work diesel engine.?and what kind of system it need to work normally. ...thx for your ansver... |
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#2
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http://www.howstuffworks.com/
"zee-qi" wrote in message oups.com... hi people. i would ask you something.Who can explain me how does work diesel engine.?and what kind of system it need to work normally. ..thx for your ansver... |
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#3
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zee-qi wrote:
hi people. i would ask you something.Who can explain me how does work diesel engine.?and what kind of system it need to work normally. ..thx for your ansver... They use diesel fuel which has a very low auto ignition temp (about 200-210C) so if a "vapour" of diesel sees 200C it auto ignites without a spark. Petrol gasolene has a higher auto ignition temp (250-280C) so it needs an electric spark to ignite it. The "system" needed is a very high pressure pump to inject the diesel into the cyl at the right time, & create a very fine atomisation so it may auto ignite becasue the air inside the cyl is above 200C. Unlike a petrol gasolene engine a diesel increases power by increasing the effect time the diesl is being injected & auto ignited, so usually diesels can generate more torque per unit of fuel burnt becasue the burn can continue even after the piston commences to retreat down the cyl. K Of course if you're wondering where your union retirement money went, have a look at what the union the liar Krause works for pays it's own!!! I also suspect the phantom boat ownership is hiding the fact that the union thinks it's just PR buying toys with other peoples' money, after all they have a corp jet We have first-class benefits, including a top-of-the-line health insurance plan, a non-contributory defined-benefit pension plan, a 401k, and a life insurance policy equal to annual salary. We contribute a share of profits to the 401k on behalf of the employee. Our employees pay $4.50 for generic prescriptions and $8.00 for non-generics, but that's going up next year to $10 and $15. New employees get two weeks vacation the first year, and that goes to three weeks the third year. In addition, we have 12 paid holidays and we shut down from noon on Christmas eve to the day after New Year's Day. We also provide 20 days of paid sick leave a year. And we have an outside company administering pre-tax flexible bennies for our employees. Our fringe benefit package follows the trade union model, except, of course, for the profit contributions to 401k's. Trade unions are not-for-profit enterprises. How do these compare to the bennies at your shop? Paid? Every year? I call "bull****". With 3 weeks vacation, 12 paid holidays, and 20 paid sick days that's 47 *paid* days off every year. Are they hourly employees? For a "small business", that's the road to bankruptcy. Boy...and you had me going there for a minute. Not quite so simple, though you are trying hard to make it so. Our business is up because we're on the cusp of an election year. Our business always goes up in a major election year. You could say we're going to be doing very well in 2004 because Bush is such a total failure. The 20 paid sick days aren't part of the "paid" days off unless those days are used. None of our people abuses sick leave. In fact, no one as yet has even come close to using 20 sick days in one year. They're there in case they're needed. Oh, I forgot. We also provide everyone with LTD. The company provides an insurance plan that pays 50% of an employe's salary for Long Term Disability. Employes have the option of purchasing an additional 16.66%, bringing their total to 66.66%. The basic benefit maximum is $4,000 per month. With the buy up, the limit is increased to $10,000 per month. |
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#4
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K. Smith wrote: zee-qi wrote: hi people. i would ask you something.Who can explain me how does work diesel engine.?and what kind of system it need to work normally. ..thx for your ansver... They use diesel fuel which has a very low auto ignition temp (about 200-210C) so if a "vapour" of diesel sees 200C it auto ignites without a spark. Petrol gasolene has a higher auto ignition temp (250-280C) so it needs an electric spark to ignite it. Are you sure you're explaining that correctly? Wouldn't research into the temperature of the air charge in a compressed diesel cylinder show that it is more than hot enough to ignite gasoline? In fact, putting gasoline into a diesel engine can destroy the engine because the gasoline is more volatile than diesel fuel and tends to "explode" rather than burn in the cylinder. That's always been one of the reasons that gasoline engines have compression ratios of just about half a typical diesel, and that traditionally gasoline has had to be doctored with "octane boosters" to burn more evenly with the lower compression. Gasoline can "pre-ignite" (fire without a spark) in a gasoline engine cylinder with a 10:1 compression rating so wouldn't it be reasonable to conclude it would be even more likely to ignite in the higher temperatures developed by about 20:1 compression. In extremely cold weather, some diesel engine operators will mix small amounts of gasoline with the diesel fuel in order to make the fuel more combustible in a diesel engine. In that case, it's the gasoline that is helping the diesel burn, not a case of more easily ignited diesel assisting the more reluctant gasoline to burn as a result of compression. Maybe I'm reading your statement incorrectly, but if not there's a chance you might want to clarify it a bit. |
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#5
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K. Smith wrote: zee-qi wrote: hi people. i would ask you something.Who can explain me how does work diesel engine.?and what kind of system it need to work normally. ..thx for your ansver... They use diesel fuel which has a very low auto ignition temp (about 200-210C) so if a "vapour" of diesel sees 200C it auto ignites without a spark. PS. Isn't diesel fuel atomised, not vaporized, by the injectors? (Could be the difference in terminology down under.) |
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#6
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#7
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In extremely cold weather, some diesel engine operators will mix small amounts of gasoline with the diesel fuel in order to make the fuel more combustible in a diesel engine. In that case, it's the gasoline that is helping the diesel burn, not a case of more easily ignited diesel assisting the more reluctant gasoline to burn as a result of compression. thats done to keep the diesel from turning into jello at low temperatures. the cars i had could take up to 30% gas for that in the winter. Matt |
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#9
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I have always understood that higher compression ratios in a gasoline
engine were one of the approaches to get higher HP, yes. Interestingly enough, turbo charged gas engines are often set up with lower compression ratios than their NA counterparts- but due to the tubo boost can still provide more power. I agree that it might have been more accurate to say that gasoline engines rely on spark, rather than "require" spark for combustion. If one were to inject gasoline into a cylinder compressed as much as air is compressed in a diesel cylinder, it's my impression that it would ignite very easily without a spark. Too easily, in fact. |
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#10
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