Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.

The Prediction of Ignition Delay and Combustion Intervals for a Homogeneous Charge, Spark Ignition Engine

Abstract: Correlations for the ignition delay and combustion energy release intervals in a homogeneous charge, spark-ignited engine are developed. After incorporation within a simplified engine cycle simulation, predicted values of these two combustion parameters are compared to experimental engine data. The correlations are based on four fundamental quantities--the turbulent integral scale, the turbulent micro-scale, the turbulent intensity, and the laminar flame speed. The major assumptions include: (1) the turbulent integral scale is proportional to the instantaneous chamber height prior to flame initiation; (2) angular momentum is conserved in the individual turbulent eddies ahead of the flame front (i.e., a ''rapid distortion'' turbulence model); and (3) the turbulent intensity scales with the mean piston speed. Two empirical constants scale the correlations to a given engine. Predicted values for the ignition delay and burn intervals show good agreement with experimental results for wide variations in engine operating and design conditions (e.g., engine speed and load, spark timing, EGR, air-fuel ratio, and compression ratio). In addition, the shapes of the predicted mass fraction burned curves agree well with published data.

Flow in the piston-cylinder-ring crevices of a spark-ignition engine: effect on hydrocarbon emissions, efficiency and power

Abstract: Ecoulement dans la zone piston-cylindre-segments d'un moteur a allumage par etincelle. Influence sur les emissions d'hydrocarbures, le rendement et la puissance

Biomass derived producer gas as a reciprocating engine fuel—an experimental analysis

Abstract: This paper uncovers some of the misconceptions associated with the usage of producer gas, a lower calorific gas as a reciprocating engine fuel This paper particularly addresses the use of producer gas in reciprocating engines at high compression ratio (17 : 1), which hitherto had been restricted to lower compression ratio (up to 12 : 1) This restriction in compression ratio has been mainly attributed to the auto-ignition tendency of the fuel, which appears to be simply a matter of presumption rather than fact The current work clearly indicates the breakdown of this compression ratio barrier and it is shown that the engine runs smoothly at compression ratio of 17 : 1 without any tendency of auto-ignition Experiments have been conducted on multi-cylinder spark ignition engine modified from a production diesel engine at varying compression ratios from 115 : 1 to 17 : 1 by retaining the combustion chamber design As expected, working at a higher compression ratio turned out to be more efficient and also yielded higher brake power A maximum brake power of 175 kWe was obtained at an overall efficiency of 21% at the highest compression ratio The maximum de-rating of power in gas mode was 16% as compared to the normal diesel mode of operation at comparable compression ratio, whereas, the overall efficiency declined by 325% A careful analysis of energy balance revealed excess energy loss to the coolant due to the existing combustion chamber design Addressing the combustion chamber design for producer gas fuel should form a part of future work in improving the overall efficiency