A banked wide-angle diffuser with application to electrostatic precipitators

作者：Barratt Dylan^*; Kim Tongbeum

来源：Proceedings of the Institution of Mechanical Engineers - Part A: Journal of Power and Energy , 2015, 229(1): 88-98.

DOI：10.1177/0957650914553458

• Wide-angle diffuser
• flow uniformity
• cylinder bank
• porosity
• aerodynamic anisotropy

This article introduces a simple and robust method of achieving low-velocity, uniform flow in a wide-angle diffuser upstream of an electrostatic precipitator used to control particulate emissions. A diffuser is inherently vulnerable to boundary layer separation, which greatly deteriorates flow uniformity, adversely affecting electrostatic precipitator performance. Conventionally, two different approaches are used to prevent separation in a diffuser: either reduce the adverse pressure gradient inside the diffuser or increase near-wall fluid momentum to overcome the existing adverse pressure gradient. The present alternative simultaneously incorporates both approaches through the use of an ultra-high porosity cylinder bank and outperforms the predominant technology in terms of flow uniformity.

• 出版日期2015-2