Sandia to demonstrate Hydrogen Risk Assessment Models toolkit prototype

With recent hydrogen fuel cell vehicle market acceleration, cities and neighborhoods where these cars are being sold exhibit a growing need to advance hydrogen fueling system deployments. Understanding and assessing hydrogen-fueling and -storage system risks is a challenging proposition because the necessary scientific information is diffuse and found only in isolated published papers, within research…

Negative Valve Overlap: A Key to Controlling Lean, Gasoline Auto-Ignition?

By Richard Steeper The drive for cleaner, more efficient engines has pushed research toward low-temperature gasoline combustion (LTGC) strategies that offer hope of achieving mandates for ultra-low engine-out emissions. Such strategies typically exploit auto-ignition to avoid the high-temperature flames associated with spark ignition. However, this approach makes LTGC control a difficult challenge, especially during part-load…