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"Tarver Engineering" wrote in message ...
"John R Weiss" wrote in message news:7Hzfc.44106$xn4.148857@attbi_s51... snip I've talked with several "oil kings" in the past, and they all told me the diesels much preferred diesel fuel over JP because of its lubricity and energy content. The big turbines didn't much care. The high compression ratios for diesel piston engines cause detonation using wide cut jet fuel. Multi-fuel diesel engines can be built and frequently are for the military vehicles such as tanks. It involves specialy adjustable injection systems and other provisions to do with lubriticity. Running on Jet fuel or Gaoline is not problem in the short term for such engines. A critical factor for the diesel engine is the "cetane number" and it is important to have a high centane number. A high cetane number means that the fuel will ignite easily but burn slowly. One problem that the German Fischer Tropsh snthetic fuel plants had in WW2 was that the fuel had far to high a cetane number and burned a little to slowly. This lowered efficiency and increased exhaust temperature althout it had to be used frequently. The solution was to blend the fuel with the low cetane output of the Bergius Hydrogenation plants. At one point prior to WW2 kerosene powered spark ignition were quite popular and they still have their proponents. Gas turbines are ofcourse indifferent to both centane number and octane rating and even viscosity and are uneffected in life or efficiency (whuch reduce in multifuel diesels) At the moment there are attempts to develop 'photo detonation' internal combustion engines that do not rely on deflageration combustion (ie combustion along a flame front rather than by infra red light) and thus will be indifferent to octane ratings. |
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