OPTIMAL DESIGN METHOD BASED ON INNER FLOW NUMERICAL SIMULATION FOR MECHANICAL
STRUCTURE OF MICROTURBULENCE
GENERATOR

YANG Jian¹  XIAO Zongliang¹  DENG Jiayin¹  WANG Leqin¹  YANG Xu²

(1. Institute of Chemical Engineering Process and Machinery, Zhejiang University, Hangzhou 310027;
2. Hangzhou Machinery Designing and Researching Institute of China Light Industry, Hangzhou 310004 )

Abstract: Based on the principle of microturbulence’s generation, the turbulent characteristic and parameters of the paper pulp flow inside microturbulence generators are investigated. The modeling and numerical equations of the flow medium — paper pulp are presented via proper assumptions on the pulp flow. Considering the microturbulence intensity and scale as parameters of the cost function, the computer fluid dynamics (CFD)-based optimal method for the structural design of microturbulence generators is proposed and applied in the design of two classical structure types: round changed to square pipes, and expanded ladder pipes. The results show that the microturbulent characteristic using expanded ladder pipes generators is better than that using round changed to square pipes generators. The numerical method and the conclusion are applicable and useful for the new design of microturbulence generators.

Key words: Microturbulence generator Optimal mechanical structure design Computtion fluid dynamics (CFD) Numerical simulation Microturbulence intensity Microturbulence scale

CLC No: TK124 O353.1

国家科技部专项资金(2004EG111014)和国家自然科学基金(50475100)资助项目. Received 20060702, received in revised form 20061217