Energy distribution analysis in boosted HCCI-like / LTGC engines – Understanding the trade-offs to maximize the thermal efficiency

Journal Article · Tue Apr 14 00:00:00 EDT 2015 · SAE International Journal of Engines (Online)

DOI:https://doi.org/10.4271/2015-01-0824· OSTI ID:1237374

Dernotte, Jeremie ^[1]; Dec, John E. ^[1]; Ji, Chunsheng ^[1]

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1. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A detailed understanding of the various factors affecting the trends in gross-indicated thermal efficiency with changes in key operating parameters has been carried out, applied to a one-liter displacement single-cylinder boosted Low-Temperature Gasoline Combustion (LTGC) engine. This work systematically investigates how the supplied fuel energy splits into the following four energy pathways: gross-indicated thermal efficiency, combustion inefficiency, heat transfer and exhaust losses, and how this split changes with operating conditions. Additional analysis is performed to determine the influence of variations in the ratio of specific heat capacities (γ) and the effective expansion ratio, related to the combustion-phasing retard (CA50), on the energy split. Heat transfer and exhaust losses are computed using multiple standard cycle analysis techniques. Furthermore, the various methods are evaluated in order to validate the trends.

• Research Organization: Sandia National Lab. (SNL-CA), Livermore, CA (United States)
• Sponsoring Organization: USDOE Office of Secretary of Energy (S)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1237374
• Report Number(s): SAND-2015-1283J; 567166
• Journal Information: SAE International Journal of Engines (Online), Vol. 8, Issue 3; ISSN 1946-3944
• Publisher: SAE International
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
HCCI engines
combustion / combustion processes