Combustion noise levels and frequency spectra in an IDI diesel engine using modified intake mixtures
- Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering
In recent years great efforts have been made to make reciprocating heat engines both more fuel efficient and more environmentally friendly. To meet the latter requirement with diesel engines the use of Exhaust Gas Recirculation (EGR) has become a popular way of reducing NOx levels. By using EGR the intake mixture composition and thermodynamic state are changed and the resulting charge contains significant quantities of carbon dioxide. The presence of this gas in the oxidant mixture leads to changes in the combustion characteristics of the engine. To a certain extent it is these modifications which enable lower NOx levels to be obtained. However, what is often overlooked is that EGR and the presence of carbon dioxide may also affect the combustion noise levels and that such noise is also a pollutant. In the work reported here combustion noise in an IDI diesel engine has been measured using in-cylinder instrumentation. The experimental rig and associated systems has been specially designed to enable a wide range of intake mixture compositions and states to be produced -- without the need for actual EGR -- and to be precisely controlled. It has been found that as carbon dioxide levels are increased that combustion noise levels also increase but that the effect is more noticeable at certain frequencies. Furthermore, whatever the carbon dioxide content of the intake mixture it has been observed that as the engine load is increased noise levels decrease. Finally it has been found possible to develop a mathematical relationship between the amount of intake carbon dioxide and the combustion noise level.
- OSTI ID:
- 163214
- Report Number(s):
- CONF-950116-; ISBN 0-7918-1289-8; TRN: IM9604%%318
- Resource Relation:
- Conference: 1995 American Society of Mechanical Engineers (ASME) energy sources technology conference and exhibition, Houston, TX (United States), 29 Jan - 1 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Emerging energy technology 1995. PD-Volume 66; Karim, G.A. [ed.] [Univ. of Calgary, Alberta (Canada)]; PB: 154 p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
DIESEL ENGINES
NOISE POLLUTION ABATEMENT
EXHAUST GASES
RECYCLING
NITROGEN OXIDES
AIR POLLUTION ABATEMENT
CORRELATIONS
CARBON DIOXIDE
MATHEMATICAL MODELS
SUBMARINES
CLOSED-CYCLE SYSTEMS
TEST FACILITIES
NOISE POLLUTION
EXPERIMENTAL DATA