Computation of Flow through an Annular Diffuser and Volute Exhaust

Defence Science Journal

T. Sundararajan¹  M. Arun¹  E.G. Tulapurkara¹ 

[1] Indian Institute of Technology, Madras

关键词: Conical diffuser;    annular diffuser;    swirl parameter;    turbulence models;    turbulent flow;    computer model;    computation;    diffusers;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Turbulent flow in a diffuser with swirl occurs in many commonly used fluid mechanical devices,eg, diffusers located downstream of a gas turbine, and in certain types of combustion chambers. Diffusers are widely used for converting kinetic energy to pressure, and a reliable prediction method of such flows with the required flow conditions would lead to the design of fluid machinery with improved efficiency. As a first step, turbulent swirling flow through a 12o included angle conical diffuser for a swirl parameter, m = 0.18 was numerically investigated using various turbulence models like standard k- , RNG-based k- , shear-stress transport (SST) kand Reynolds stress model (RSM). Though the comparison between the experimental and the predicted mean velocity profile by RSM is superior to that by RNG kand SST models, the latter two models give closer comparison with the experimental pressure distribution. Subsequently, computation of flow inside a complex duct involving axisymmetric annular diffuser, transition from rectangular to circular cross section, and exit pipe have been carried out using RNG kand SST k models. The comparison of computed and experimental results indicates that the SST k model gives predictions with reasonable accuracy.

【 授权许可】

Unknown