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Characterizing the development of thermal stratification in HCCI engines
Post, May 16, 2011 • Homogeneous charge compression ignition (HCCI) engines can deliver high efficiencies—comparable to a diesel engine or higher—and ultra-low NOx and particulate emissions. They also offer the potential for lower cost than diesel engines and do not require expensive diesel-emissions after treatment for a significantly lower overall package price. HCCI is therefore...
Figure 1. Schematic of the optically accessible HCCI research engine.|Temporal sequence of T-map images at the mid-plane of the pancake combustion chamber|Figure 3. T-map image sequence from mid-plane to near the wall at 360° CA. The “z” value below each image gives the distance of the image plane below the cylinder head.|Figure 4. Side-view T-map image showing the thermal stratification in the bulk-gas and near-wall regions at TDC (360° CA).

Future scientists explore Sandia and the CRF
Post, April 29, 2011 • On April 28, nearly 200 daughters, sons, and family friends spent the morning at Sandia’s California laboratory with their parents, getting a look at where mom and dad work and engaging in activities around the site. As always the CRF was a major player, staging several popular demonstrations and exhibits....
|Girl looking at heat map on monitor

Government Officials Tour Sandia California
Post, August 26, 2011 • Chuck Mueller (left) shows Gavin Newsom (right) a high-speed movie of a new fuel-injection strategy. (Photo by Randy Wong) The On June 29, Gavin Newsom, Lieutenant Governor of California, visited Sandia to learn about current and emerging energy research at the site. Hosted by Vice President Rick Stulen, Newsom learned...

Of blackboards and computer screens: scientific programming in the 21st century
Post, May 17, 2011 • Since he was a college student, Damian Rouson has been fascinated by the intersection of science and computing. Computers have transformed scientific research, yet the fields still exist on separate planes. He takes on the challenge of rendering computer languages, so vital to scientific advancements, more expressive and easier to...

Sandia’s Summer Institute
Post, August 26, 2011 • Technology and Policy Tools for Energy in an Uncertain World On August 8, Sandia launched a new cross-discipline week-long research program for top graduate students from the nation’s premier universities. At the Sandia Summer Institute (SSI), twenty-one enthusiastic graduate students met to collaborate in small teams, working side-by-side with leading...

Student Interns Return to the CRF
Post, August 30, 2011 • This summer’s interns include (left to right) Romina Rodiguez, Nathan Greco, Daniel Nilson, Cassandra Janakos, Alexander Lloyd, Calvin Ball, Mari Sanchez, and Matthew Morabito (not pictured). The Summer Technical Student Internship Program at Sandia National Laboratories provides opportunities for undergraduate and graduate students majoring in science, math, engineering, and other...

Thermochemical integration key to improving the efficiency of bio-ethanol production
Post, May 16, 2011 • A recently concluded CRF study as revealed the important role of combustion in the efficient operation of cellulosic ethanol plants for producing  biofuels. Unlike ‘first-generation’ ethanol derived from the fermentation of sugar or starch sources (such as corn), future production of ethanol in the United States is expected (and indeed...
Figure 2. Schematic of the modeled, prototypical lignocellulosic biochemical ethanol plant utilizing separate enzymatic hydrolysis and fermentation steps.|Figure 1. Typical composition of a softwood tree, in this case hybrid poplar.|Figure 3. Energy inputs and outputs (on the basis of lower heating value, left pie chart) and exergy inputs and outputs (right pie chart) for the conventional technology biochemical process design case.

Turbulent Jet Flame Database Generated for Sooty Fuels
Post, August 30, 2011 • Figure 1. Design drawings of burner (a and b), showing the central fuel tube surrounded by a perforated plate that supports small pilot flames for stabilizing high-speed flames. Photograph (c) of pilot flames and the base of an ethylene jet flame. The CRF has a long and distinguished history of...