U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
 
Old 08-03-2009, 10:46 PM
 
Location: Texas
5,070 posts, read 8,983,457 times
Reputation: 1632

Advertisements

MADISON — Diesel and gasoline fuel sources both bring unique assets and liabilities to powering internal combustion engines. But what if an engine could be programmed to harvest the best properties of both fuel sources at once, on the fly, by blending the fuels within the combustion chamber?
Reply With Quote Quick reply to this message

 
Old 08-03-2009, 10:48 PM
 
569 posts, read 540,749 times
Reputation: 889
Tell me more
Reply With Quote Quick reply to this message
 
Old 08-04-2009, 10:22 AM
 
Location: Londonderry, NH
41,492 posts, read 51,367,509 times
Reputation: 24613
Using Diesel oil as an ignition system in a very high compression Natural Gas reciprocating engine has been done for years. A small amount of Diesel is injected at the proper time into a compressed mixture of Gas and air. The very high compression (around 15:1) heats the mixture enough to light off the oil and the resulting flame lights the gaseous mixture. It allows Nat Gas to be used as a fuel without the danger of a spark ignition in an environment where any leaking gas might be "sparked” into a major explosion. This was a problem with NG pipeline spark ignition engines because pipeline gas is essentially odorless and leaks were hard to detect.

The major difference between Diesel oil and gas (both natural and gasoline) is Diesel oil burns as a droplet from the outside in to nothing with a decreasing heat release during combustion while the gas mixtures burn along a flame front with peak heat release somewhere between ignition and burn out. As the molecular weight of the vaporized mixture increases the susceptibility to detonation is increased. Detonation happens when the gas mixture burns at sonic velocity and created an engine damaging (sometimes destroying) shock wave. Natural gas is a low molecular weight hydrocarbon with only one Carbon atom and is very resistant to detonation. This is why it can be used in Diesel compression ratios.

A reciprocating engine capable of high enough compression to operate on both Diesel Oil and vaporized gasoline in varying mixtures would be very useful where the supplies of either fuel were unreliable.
Reply With Quote Quick reply to this message
 
Old 08-05-2009, 06:08 PM
 
Location: Texas
5,070 posts, read 8,983,457 times
Reputation: 1632
I was just re-reading the article I posted. Looks like the mixture is variable, depending on the load.
Quote:
Under heavy-load operating conditions for a diesel truck, the fuel mix in Reitz' fueling strategy might be as high as 85 percent gasoline to 15 percent diesel; under lighter loads, the percentage of diesel would increase to a roughly 50-50 mix. Normally this type of blend wouldn't ignite in a diesel engine, because gasoline is less reactive than diesel and burns less easily. But in Reitz' strategy, just the right amount of diesel fuel injections provide the kick-start for ignition.
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology
Follow City-Data.com founder on our Forum or

All times are GMT -6.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top