A method for Swirl Generation during the induction in Diesel Engine: Numerical and experimental research

摘要

Swirl in an utmost important pattern of turbulence flow which dominantly governs the general performance of diesel engine. For efficiently generating swirl during the induction in diesel engine, a new method is propounded by introducing a device named Swirl-Generator in the present paper. Series of numerical simulation are conducted to investigate the effects of each geometric parameters of Swirl-Generator on the general performance (including swirl-generation capability and discharge capability), and an optimal design direction is obtained from the simulation results. Then, and the flow motion and the flow pattern induced by Swirl-Generator is investigated experimentally in a visible-analog bench by PIV. Finally, the A626-type Swirl-Generator which indicated has the best comprehensive performance is mounted on an actual single-cylinder diesel engine for verifying its practical performance, the results show that the diesel engine can obtain better fuel economy, especially at low- and intermediate-speed conditions, after matching a Swirl-Generator.