Fluent对旋转式动力机械的分析.pptVIP

Introduction to Rotating Machinery Analysis Using Fluent Frank Kelecy Fluent Inc. Agenda Introduction Single moving reference frame (SRF) model Multiple moving reference frame (MRF) model Mixing plane model Sliding mesh model Questions? Motivation Flows involving rotating domains occur frequently in engineering Examples compressors and turbines fans and pumps rotating cavities, seals, and bearings mixing equipment fluid coupling devices and torque converters air motors marine and aircraft propellers and many more… Computational Fluid Dynamics (CFD) today plays a central role in the design and analysis of rotating machinery Examples of Rotating Machinery Goals of the Training Provide an introduction to rotating machinery modeling Examine the four major classes of rotating machinery problems Single rotating reference frame (SRF) Multiple rotating reference frame (MRF) Mixing plane Sliding mesh Present details on modeling rotating machinery problems using Fluent Model setup Solution process (steady-state and unsteady) Answer your questions! Types of Rotating Machinery In this course, we will classify rotating machinery as follows: Turbomachinery - machines which add work to or extract work from a fluid compressors, fans, pumps - add work to achieve a pressure rise in the fluid turbines, windmills - extract work from fluid to drive other machines Mixing equipment - machines which are designed to mix fluid (and possibly solid) materials for use in a chemical processing application industrial mixing tanks Rotating tanks, seals, cavities, and other devices disk cavities and labyrinth seals in gas turbine engines electric motor cooling passages disk drives rotating tires on automotive vehicles All of these applications involve rotating surfaces and domains (and thus may use a rotating reference frame for modeling) Classification of Turbomachinery Axial machines Flow through the machine is (in general) aligned with the axis of rotation Examples: propellers, axial