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[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]

Sandia researchers use Direct Numerical Simulations to enhance combustion efficiency and reduce pollution in diesel engines; cool flames

October 13, 2017

Sandia National Laboratories mechanical engineer Jackie Chen and colleagues Alex Krisman and Giulio Borghesi recently identified novel behavior of a key, temperature-dependent feature of the ignition process called a cool flame in the fuel dimethyl ether. The researchers used a two-dimensional direct numerical simulation (DNS) to provide a fully resolved description of ignition at diesel engine-relevant conditions. The focus of the study is on the behavior of the low-temperature chemistry (LTC) and the way in which it influences the high-temperature ignition.

The cool flame burns at less than 1,150 Kelvin (1,610 ˚F)—about half the typical flame burning temperature of 2,200 K. While cool flames were first observed in the early 1800s, their properties and usefulness for diesel engine design have only recently been investigated.

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Study concludes US CAFE regulation can accelerate EV market penetration

July 09, 2017

In a new study, a team from the University of Central Florida and MIT has found that the US Corporate Average Fuel Economy (CAFE) Standards is an effective policy solution that does increase the adoption of EVs, whether it is implemented alone or in conjunction with another policy such as government incentives.

In a study published in the journal Energy Policy, the researchers developed an agent-based model to estimate the potential future market shares of EVs considering the existing inherent uncertainties under different policy scenarios, including the current footprint-based CAFE regulation.

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Groupe Renault to further autonomous vehicle development with new simulation joint venture with Oktal

July 04, 2017

Groupe Renault is taking a 35% stake in a new joint venture, Autonomous Vehicle Simulation (AVS), formed together with Oktal, a subsidiary of Sogeclair, a French aerospace and simulation company based in Toulouse, France. This step will allow Renault and the Renault-Nissan Alliance to continue delivering a menu of advanced technologies by furthering autonomous vehicle development testing in a virtual environment.

The newly formed AVS partnership will also benefit the Renault-Nissan Alliance, which has committed to launch more than 10 vehicles with autonomous capabilities by 2020. The Alliance has already engaged in the virtual testing of Autonomous vehicles using SCANeR,/a> simulation software, originally invented by Renault, that was co-developed with Oktal.

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Ricardo developing advanced simultation capability for IMPERIUM project for HD emissions reductions

March 31, 2017

Current state-of-the-art heavy duty diesel engines are both highly efficient and offer low emissions. However, in real-world driving, fuel efficiency and emissions aftertreatment technologies interact with each other and also vary according to the vehicle application, its prevailing operating conditions and its mission.

The IMPERIUM project (IMplementation of Powertrain control for Economic, low Real driving emIssions and fuel ConsUMption) is a major EU-funded research initiative (€10 million total, €6.6 million from the EU) comprising a total of 17 industrial and academic partners. The main objective of the project is to reduce fuel consumption by 20% (diesel and urea) against the project’s 2014 Euro VI baseline vehicle, while keeping the vehicle within the legal limits for pollutant emissions.

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