1992-09-01

A Study on Turbulence Generators for the Intake Manifold of Dilute Spark-Ingnition Engines 921667

Lean burn spark-ignition engines (S.I.E) are currently under scrutiny for their fuel economy and pollution reduction potential while using fuels with ordinary anti-knock quality.
This study was concentrated on turbulence generation in a simulated inlet manifold of S.I.E. via the use of several designs of turbulence generators. A special test set-up was specifically designed and built for this study, and special measuring probes were constructed, developed and calibrated to find out the turbulence level behind each turbulence generator. Four types of swirl and turbulence generators were used and tested to find out the optimum design and operational parameters.
The investigation has been carried out using air as the working medium, while the effect of flow velocity, temperature and turbulence generator design parameters were studied and their effect on the relative turbulence kinetic energy was experimentally found out. Also the decay in turbulence level in the inlet manifold was measured as well as the effect of air to fuel ratio and the existence of bends downstream the generator. Correlations were developed for each type of turbulence generators to predict the level of turbulence as well as the turbulence decay with distance. The optimum type of turbulence generators was put forward and optimum design parameters for the generator were found out.
Based on the results of this study it can be concluded that replacing the conventional throttle valve of the engine by two turbulence generators in series (disc type of delta-wing type) may be the optimum way to achieve a high turbulence level and a high volumetric efficiency.

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