Experimental Analysis of Flow through Concentric Vane Swirler in Combustion Chamber Using Atmospheric Air

Swirling flow is main flow produced by air swirler, such flow is combination of swirling & vortex breakdown. Swirling flow is widely employed in combustion system for flame stabilization in combustion system. Swirling flow, which are highly complex, have characteristic of both rotating motion & free turbulence phenomenon encountered as in jet & wake flow. Presence of swirl results in setting up of radial & axial pressure gradient is sufficiently large to result in reverse flow along axis & generating an internal circulation zone. Swirl flows offer an interesting field of study for aerospace and mechanical engineering in general for combustion, separation and mixing of flow. Since, it involves complex interaction of recirculation and turbulent mixing. Swirling flow generates rotating flows, turbulence and free jet wakes at the downstream of swirler in combustion chamber. So there is complex interaction between pressure gradients and fluid flow. Swirling flows in both reacting and non- reacting conditions occur in wide range of applications such as gas turbines, marine combustor burners, chemical processing plants, rotary kilns, electrostatic separator and spray dryers. Electrostatic precipitator are highly efficient filtration device that minimally impede the flow gases through the device and can easy remove the fine particulate matter such as dust and smoke from the air stream. Concentric Swirler is being used to remove the particulate, especially from smoke, which after striking it, gets settle down and get collected in the accumulator. Experimental studies show that swirl has large-scale effects on flow fields: jet growth, entrainment and decay and flame size, shape, stability and combustion intensity are affected by the degree of swirl imparted to the flow. Therefore, swirling flows are commonly used to improve and control the mixing process. This work presents the design of swirler, applicable for producing the CRZ (control recirculation zone). The whole assembly is design which includes inlet pipe, swirler, expansion chamber, tail pipe. Axisymmetric Swirler model is designed with concentric swirler. The complete behavior of the flow in the chamber and the flow of gases through the device can easily remove the fine particulate matter such as dust and smoke from the air stream. Experiment has been done taking atmospheric cold air instead of hot gases in combustion chamber