Hydrogen in internal combustion engines- NASA investigation

hydrog2
0 comments
hydrogen fuel systems for cars, hydrogen fuel systems for trucks, hydrogen fuel systems power supply, new agents wanted for hydrogen fuel systems, Uncategorized

Results from 1977 investigation into the use of hydrogen on demand for use in internal combustion engines.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.gov/19770016170.pdf

This investigation concluded there was a significant reduction in emissions and a decrease in the total energy consumption of a multicylinder piston engine running on gasoline (petrol) and a hydrogen-gasoline mixture.

Hydrogen

The results was show to extend the efficient lean operating range of gasoline by adding hydrogen.  Both botted hydrogen and hydrogen produced by a methanol steam reformer were used and compared to results from all gasoline.

The results were used to explain the advantages of adding hydrogen to gasoline as to a method of extending the lean operating range.   The minimum –energy –consumption equivalence ratio  was extended to leaner conditions by adding hydrogen while the minimum energy consumption did not change  – showing that more usable energy was provided.   All emission levels decreased at the leaner conditions and there was a significantly  increased flame speed and reduced engine lag over all equivalence ratios   (60 cm/sec increase to 120 cm/sec at low RPM         to              110 cm/sec increase to 150 cm/sec at high RPM)

  • It was shown that pure hydrogen injection produced the same results as for hydrogen produced from the methanol reformer process
  • The minimum-energy-consumption equivalence ratio decreased from 0.79 to 0.67….. an 18 % reduction
  • Oxides of nitrogen production are appreciably lower for hydrogen / gasoline mixture . Gasoline with reformed hydrogen from methanol have higher NOx  emissions as the reformer must produce gas at a high enough temperature to prevent water and methanol condensation and the higher inlet temperature can cause higher peak combustion temperatures and therefore higher NOx emissions
  • Whilst there are limitations of using the methanol reformation process , with proper design and catalyst selection to produce the hydrogen it is a possible way to use the energy lost in exhaust gases to produce hydrogen as an interesting supplementary or alternative fuel source..

61total visits,1visits today

Comments are closed.