FLOW INVESTIGATIONS IN OPEN AND SWIRL COMBUSTION-CHAMBERS OF IC ENGINES - A COMPARISON

Flow parameters such as mean velocity and turbulent fluctuating veloci ty have been studied both in a swirl and open combustion chambers of a diesel engine using a constant temperature hot-wire anemometer under motoring conditions. The nature of now field activity is very differen t in both these types of chambers. A vigorous now field activity has b een observed in swirl chamber during compression and an opposite effec t was noticed in open combustion chamber. Large mean velocity was meas ured at some locations (more than 100 m/s) in the swirl chamber during the last part of the compression stroke. Similar to swirl-squish inte raction. in open chamber, a swirl-cross now interaction was noticed in swirl chamber. The effect of speed and compression ratio on flow para meters has been studied in both types of chambers.