Filtration system as standard on Cummins engines
- 关键词：Compressor ; Performance ; Casing treatment ; Entire annular recess ; Rectangular configuration ; Statistical model
- 刊名：Filtration and Separation
- 出版年：2007
- 期刊代码：29_00151882
- 类别：ce
- 出版时间：November 2007
- 卷：44
- 期：11
- 页码：9
- 文件大小：52 K
摘要
The tip clearance between a compressor’s rotating blades and its casing has an unfavorable influence on performance. By applying an abradable coating (insert) to the casing over the rotating blades, this tip clearance can be reduced to practically zero. A rather frequent variant is for the rotor blade tips to carve an entire annular recess in this coating. Rectangular recesses of various configurations have been tested in several different researches. The results of these investigations are processed using the Group Method of Data Handling. A statistical model is developed that predicts the influence of rectangular recesses on a compressor stage’s efficiency and stable operating (flow) range. The model takes into account the six principal geometric parameters of a rectangular recess, as well as the Lieblein rotor diffusion factor. Analysis of the derived model has also determined which of these parameters are the most influential. Rectangular entire annular recesses are one of the simplest and most progressive types of casing treatment, and this paper concludes with an overview of existing research that supports this claim.